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Oracle BPM Online Training

Oracle BPM Online Training
Get hands-on exposure in the creation of genuine Oracle Business Process Management applications with Oracle BPM by real-time experts. By the end of this training, you will get practical exposure to d

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Oracle Apps Technical Course
Enroll today for the best Oracle Apps Technical training o to involve in the application programming of the oracle corporation. By the end of the course, you will acquire practical exposure to oracle

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Oracle Apps Functional Online Training
Enroll for Oracle Apps Functional Online Training Course to become a specialist as an Oracle Apps Functional Consultant. Throughout this course, you will be gaining practical exposure to operation and

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Microsoft Dynamic CRM Online Training

Microsoft Dynamic CRM Online Training
Make your dream come true as a Microsoft Dynamic CRM developer by developing your skills and enhance your knowledge on various application modules, customization, configuration, integration by live in

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Installshield Training
Acquire practical knowledge of creating installers (or) software packages as per the latest library using Installshield by live industry experts with practical use cases and makes you master in creati

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Build and Release Online Training
KITS Build and Engineer Online Training Course taught by live industry experts enhances your practical knowledge on the build and release concept and process, DevOps Concept, and process through pract

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SAS Online Course
Master in advanced analytics techniques of SAS language through SAS macros, Machine learning, PROC SQL and get the necessary skills to clear SAS programmer Certification through SAS Online Training Co

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Teradata  Training

Teradata Training
Become a master in developing data warehousing applications taught by real-time industry experts through hands-on exercises and use-cases and become a king of Data warehouse at Teradata Online Trainin

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Linux Online Training
KITS instructor-led online course will help you with the necessary skills to become a successful Linux Administrator. KITS Linux online training course will help you in imparting the practical knowled

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Testing Tools Online Training
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Oracle DBA Online Training
KITS Oracle DBA Online Training imparts you to gain the skills and the knowledge required to install, configure, and administer the Oracle Databases. Through this course, you will master in creating a

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Python Online Training
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Oracle SOA Online Training
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Web Methods Online Training
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JAVA Online Training
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Data Science Online Training
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Blog

What is Ab initio?

Data plays a major role today.  Whether it’s a start-up (or) a well-established company data is essential. Depending on the size of the company, people store this data in various places like a data warehouse, data mart with secured encryption. Since the data gets generated from different sources, it would be in multiple formats like xlsx, PDFs,.doc. .txt . So we need to convert these multiple forms of data to a single format and then remove the redundancies and finally sent them to the data marts. To perform all these functions IT companies use ETL tools like Ab initio to process the data. What is the need for Business Intelligence? Running a business in the IT industry is like walking in a dark room.  In simple terms, Business Intelligence (BI) is the process of deriving meaningful information (or) insights from raw data. From the past one year, it has gained high significance in many verticals across the globe. Today many BI tools like Ab initio,  Informatica, Cognos, Data Stage were widely used in the market. Today in this article. I'm going to discuss with you the need and importance of ab initio when compared to the other bi tools in the market. Let us start our discussion with What is ab initio? Ab initio stands for Start from the beginning. It is a business intelligence platform comprises of several data processing products. This platform has a powerful GUI based parallel processing for ETL management and data analysis. This platform works with the client- Serer model. Here the client is a Graphical Development Environment (which is an IDE) that resides on the client system. And the server system is called Co-Operating System. This Co-Operating System resides on the mainframe (or) the remote UNIX system. The abinitio code is known as a graph that has a .mp extension. In ab initio etl the graph from the GDE needs to be deployed in the corresponding .ksh version. This Ab initio ETL platform provides a robust architecture that allows simple, fast, and highly secure integration of systems and applications.  This tool is capable of running heterogeneous applications parallelly over the distributed networks.  Besides, it is capable of integrating diverse, complex, and continuous data streams ranging from gigabytes to petabytes to provide both ETL and EAI tasks within a single and consistent framework. Moreover, it is capable of integrating arbitrary data sources and programs and supplies entire metadata management across the enterprise. Besides, it is capable of integrating arbitrary data sources and programs and supplies the entire metadata management across the enterprise. This Business Intelligence tool solves the most challenging data processing issues for leading organizations in many areas like telecommunications, finance, insurance, eCommerce, retail, transport. In these areas, ab initio solutions are constructed and employed incredibly speedily and provide the best performance and scalability. Know more on Ab initio at Ab iniito Online Training  Architecture: This Ab initio business Intelligence software consists of 6 different processing products. They are: Co-Operation Systems: It is the root for all ab initio functions and base for all the ab initio process. And this platform is capable of running different environments like AIX, HP-UX, Linux, Solaris as well as Windows Component Library: It is a reusable program module for sorting, data transformation, and excessive space database loading and unloading. It is a flexible and extensible tool that adapts at run time to the various formats of data entered. Graphical Development Environment: Graphical Development Environment provides an intuitive graphical user interface for editing and executing applications. Here you can easily drag and drop components from the library to the canvas and configure them and then connect to the canvas. Besides, its GDC graph compilation system comes with the new release of UNIX Shell script that can be executed on the machine where GDE is not installed. Besides, it provides an easy to use front end application for designing ETL graphs. It facilitates to run and debug ab initio jobs and traces the execution jobs. Enterprise Meta Environment: It is a data store that allows the tracking of changes in developed graphs and the metadata used in their development. Besides, it offers tools such as dependence analysis, metadata management, statistical analysis as well as version controlling. It is capable of storing both technical and business metadata. And this data can be accessed from a Web browser, Ab initio GDE, and Co-Operating System command line. Data profiler: It is an analytical application that can specify the data range, scope, distribution, variation as well as quality. It can run in a graphical environment, on top of the co-operating system.  Condcut>It: It is high volume data processing systems developing tool. Besides,it allows the user to combine the graphics from a graphical development environment with custom scripts anf programs from various vendors. Besides, it provides both graphical and command-line interface to Conduct>it. Why Should you Ab initio over the other? Even though many ETL Tools were available in the market, people opt for ab initio due to the following reasons: One-Stop Solution: This tool provides a one-stop solution to a wide range of data processing solutions. Performance: It is capable of handling distributed processing as well as processing and loading the data in real-time.  And its parallelism techniques process the data much faster. Reliable Customer Base: It is the tool used in big data industries like insurance, banking, logistics, stock market, retail, finance to process the complex and enormous volume of data. Development Time: The development time in handling the errors is less than many of its competitors. Efficiency: This platform provides a lot of features from the built-in components. Here the data is sorted and processes quickly. Here the parallel processing and error processing parameters were highly useful Easy Maintenance: The maintenance of these ETL tools is much easier and cheaper than many other ETL tools. Moreover, here the transformations were most advanced as well. Likewise, there are many reasons to use ab initio when compared to the other ETL tools in the market. By reaching the end of this blog, I hope you people have acquired the best knowledge on ab initio ETL and its application in the real-time industry. In the upcoming post of this blog, I'll be sharing the details of the interaction of real-time data through ETL. You people can get practical knowledge on ab initio through Ab initio Online Course . Also, check our later internet questions at Ab initio Interview Questions and get placed in an MNC.  

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What is MuleSoft?

  Mule is one of the popular Enterprise Service Bus (ESB). This is a software integration platform responsible to connect data, devices, and applications on many cloud computing platforms.  This is completely a java based platform and is capable of connecting other platforms like Facebook, Twitter, and Linkedin.  This Mulesoft works on a run time engine called Anypoint.   History of Mulesoft: Mulesoft is from San Fransisco established by Ross Mason in the year 2006. The name mulesoft indicates that this tool eliminates the mule work. As of 2018, July, this 1200 + Clients. In the year 2018, Salesforce acquired mulesoft.  What does Mulesoft do? It allows developers to interact and communicate with any application in a very versatile manner regardless of the framework it is used.  It builds an active communication channel for sending and exchanging the data over a secure and reliable platform between the integrated applications. This platform contains tools to update and handle the test application. Mule is lightweight and highly scalable allows you to connect small connections over time.  This Mule ESB is responsible for managing all the interactions between the applications and components. It manages the network regardless of the operating system. This integration platform has a variety of data sources as well as the applications to perform analytics as well as the ETL Processes.  Likewise, MuleSoft has created connectors for Saas Application to permit the analysis of Saas related to cloud-based and conventional data sources. What does the Mulesoft Any Point platform do? The MuleSoft Any point platform is designed over the enterprise service bus(ESB) and mule driven architecture. This Enterprise platform is capable of creating a network of data, applications, and devices through API. This platform has expanded the view of integrations and provides the flexibility to integrate new technologies on each integration without custom coding.This mulesoft  anypoint platform runs on mule run time engine.  Besides it supports a variety of pre –built connectors for comman databases, applications, protocals and API’s. Mulesoft Architecture follows the data integration trends of creating building blocks of connectors, API’s and data flows that simplifies the data integration. Businesses can connect third-party applications, SaaS offerings, data storage, cloud storage, and other in-house data sources to analyze and mine the data across the company.  This Mulesoft Any Point provides a developer kit to create custom connectors.  Besides, Mulesoft can also be used with the studio data flow, graphical interface, and the API Designer kits as per the need.   Besides, mulesoft develops the data weave to simplify the data analysis, transformations, queries, and normalization. Since the data weave is integrated with the rest of the mule soft any point platform pre-built templates can be used for complex analysis. Get more information on Mule from real-time industry expert at MuleSoft Online Training  What are the components of MuleSoft? Mulesoft platform has several tools and services. Some of them were: a)API Designer:  It is a web-based graphical tool that the developer can use to design the API, as well as can share it with other team members. A developer can also choose to reuse the specific components of an API, such as the security schema. b)API Manager:  It is an interface through which the developer can manage the API’s as well as secure them through API Gateway. With this component of the Any Point platform, it is possible to control user access to the API’s and ensure secure connections to the end data sources. c)Any Point Studio:  It is a java-based graphical environment that the developer can use to deploy on-premises and cloud environments.  It includes the features to map, built, edit and debug the data integrations d)Any Point Connectors:  These are the set of built-in connectors,  that the developer can use to integrate applications with thousands of third-party REST and SOAP. e)Any Point Analytics:  It is an analytics tool to track API metrics such as performance and usage. A developer can use these tools to create custom charts and dashboards to visualize the API performance. Moreover, this platform is capable of identifying the root cause of performance issues. f)Any Point Run Time Manager:  It is a central console through which  a developer can provision and monitor all the resources deployed on the Any Point platform g)Any Point Exchange: This is the central hub. The development team uses this to store and access the connectors, API’s, temaplates, documentation and other resources. i)Any point Monitoring: It is a dashboard that helps the development team to monitor the application health. j)Any Point Visualizer:  It is a graphical tool to map the API and its dependencies in real-time.   How to implement Mule ESB? The purpose of Mule ESB is to separate and activate applications to communicate in a highly scalable and fast network bus.This platform uses the messaging server such as AMQP and JMS that allows the bus connectivity through application separation. Moreover, Mule servers were the only capable of bus implementation. What are the advantages of Mulesoft? a)Mule components can be of any type you require.  You can easily integrate anything from a plain Object-Oriented (Pojo) to a component from another framework. b) Mule and ESB enable the significant component reuse. It allows you to use your existing components without changes. Moreover, here the components do not require any mule-specific code to run. Here the business logic is completely separate from the message logic. c)Here the messages can be in any format from SOAP to binary image files. Mule does not force any architect constraints such as XML messaging (or) WSDL Service contracts. d) You can deploy mule in a variety of topologies not only ESB. Because the mule is lightweight, it will dramatically and increase productivity to provide secure and scalable applications that are adaptive to change and scale up (or) scale down the applications. Likewise, there are many advantages of Mule ESB. I hope by this you people have gotten the best knowledge on Mule.  You people can acquire more practical knowledge on this tool from the roots at Mule Soft Online Course . In the upcoming post of this blog, Ill be sharing the details connections of mule ESB. Mean while have a look at our Mule ESB Interview Questions.  

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What is App V ?

The requirement of a project varies from one to the other. So buying and installing the software for every project is a bit expensive. And the companies may not be in a position to afford all those. So to overcome all those problems, the operation team virtualizes the applications according to the project requirements. In this article, I'm going to explain to you what is app v? What is its use in the IT Industry. Let us start our discussion with What is App V? Microsoft application virtualization is also known as App-V is an application virtualization and application streaming solution. This application virtualization enables the administrator to deploy, update, and support applications in real-time. With App V, we can transform the locally installed products into centrally managed services. Here the applications were available where it does not require pre-configuration (or) the changes to the operating system. It makes the applications available to the end-user computer without having to install the applications directly on those computers. App V makes the application possible through a process called sequencing the application. This enables each application to run in its self-contained virtual environment on the client computer. Through this, we can eliminate the application conflicts but the applications can still interact with the client computer. Here, the App-V client is a feature that lets you interact with the application after it has been published to the computer. Here the client manages the virtual environment in which the virtualized application runs on each computer. Once the client has installed it on a computer, the applications must be available to the computer through a process called publishing that enables the end-user to run virtual applications. Through publishing, we can copy the virtual application icons and shortcuts to the computer. Moreover, this application package content is available to the end-users computer. The virtual application package content can be copied onto one (or) more application virtualization servers where it can stream down to the client on-demand and cached locally. Here the file servers and web servers can also be used as streaming servers and the content can be copied directly to the user computer. Depending on the size of the organization, you need to have many virtual applications available to the end-users across the world. Get more information on App V from live experts at App V Online Training What is a virtualized application? Whenever an application is virtualized, the essence of an application is previously captured and is dynamically instantiated on the target machine, whenever it is necessary.  These virtual applications are the same applications that you will be installing on the operating system today where it does not require installation as well as configuration.  We can describe the app virtualization as a deep set of files and registry redirections. Besides, we can view the app virtualization as a layering technology. Through App V, we can separate the application from OS instances that frees you to deliver any application to any desktop without any conflicts. What can be virtualized? Most of the enterprise desktop applications can be virtualized with App V. But there are some restrictions as well the situation that might work in a bad way. And we cannot deploy 100% of the application through App V and opt for another method if we cannot virtualize it in a single method. For an instance, you can use sccm to deploy MSi’s for native install (or) makes use of FSLogix (or) layering the product. When compared to other techniques in the market, App V supports a high percentage of your applications. How does it work? This starts working through packaging applications. This involves installing the applications and configuring them with a special capture tool called App –V Sequencer. Once we capture the application, we can use it on the multiple operating systems versions and simplifying your management application management needs. The goal of this sequencer is to capture the application and render it on a machine Os, and user format.  App –V uses a unique streaming delivery with catching that allows for extremely fast delivery and offline capabilities. At the user operating system when the package is published, the app-v extensions are directly added to the operating systems, and placeholders for file and registry settings are added in a special set aside for virtual applications. The app-v client uses a combination of filter drivers and client services to enable the application virtualization magic to occur. What are the components of Application virtualization? This application virtualization has the following components. They are : Microsoft App-V Management Server: It provides a centralized location to manage the app –v infrastructure for delivering the virtual application to both app –v desktop client and remote desktop services. Here the app v uses a Microsoft SQL Server to store the data where one (or) more App V management servers can share a single SQL Server data store. Here the app v management server authenticates the request and provides the security, meeting, monitoring, and data gathering required by the administrator. Here the servers uses the active directory and the supporting tools to manage user and applications. The app-v management server has a silver light-based managed management site that enables administrators to configure app v infrastructure from any computer. Besides administrators can add and remove applications to manage shortcuts and assign access permissions to users and groups and create connection groups. App V publishing Server: It provides app v clients with entitles applications for a specific user and hosts the virtual package for streaming. The publishing server can be installed on the same machine (or) a separate machine. In live environments, the separate installation provides greater scalability of the infrastructure. App V Remote desktop client: It enables the remote desktop host servers to utilize the capabilities of app desktop clients for shared desktop sessions App V Virtualization Sequencer: It is a wizard-based tool that the administrators use to transform traditional applications into virtual applications. Here the sequence produces the application package that consists of several files. This includes a sequenced application (App V) file, Windows installer file (MSI) file that can be deployed for standalone operations. App V Management console: It is a administer tool to manage and set up, manage, and administer the app v servers. This is responsible to create, manage, and update the virtualized application packages. Likewise, there are some other minor components in App V. By reaching the end of this blog I hope you people have acquired enough knowledge on App V. In the upcoming post of this blog, I’ll sharing the details of creating the application using app v. You people can get practical knowledge on App V from beginner to the advanced level at App V Online Course

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What is Power Shell?

In today’s world, there are several ways to interact and manage with the computer operating system. Some of them were the green screen, terminals, command-line interface, and the graphical user interfaces. Besides, there are some more other methods like application program interface (API) calls,  and web-based management calls. Among those, the command line interface is capable of performing repetitive tasks quickly and accurately when managing a large number of the system. Hence, Microsoft has introduced shell scripting to meet the needs of the user and ensure that each task is done in the same manner.  This article gives you a brief explanation of power shell regarding the need and application in real-time in the IT industry. What is a Power shell? Power shell is a Microsoft scripting and automation platform. It is both a scripting language and a command-line interface. This platform is built on the .Net framework. This Microsoft platform uses a small program called cmdlets. This platform is responsible for the configuration, administration, and management of heterogeneous environments in both standalone and networked topologies by utilizing the standard remoting protocols. Once you start working with a power shell, it provides a set of opportunities for simplifying the tasks and saving time. It does this, using a command-line shell and an associated scripting language. At the time of release, this powerful tool essentially replaces the command prompt to automate the batch process and create the customized system management tools. Today many operation teams like system administrators rely on 130+ command-line tools within PowerShell to streamline and scale the task in both local as well as the remote system. Do you want to expertise on this tool? then visit Power Shell Online Training  Why Should you use a power shell? Powershell is a popular tool for many MSP because its scalability helps in simplifying the management task and generate insights into devices across the medium (or) large scale devices. Through power shell, you can transform your workflow to To automate the time-consuming task: With Cmdlets, you don’t have to perform the same task again and again, and even takes time for the manual configuration. For instance, you can use cmdlets like the Get command to search for other cmdlets. Besides commands like cmd-help responsible for discovering the syntax of the cmdlet, and uses the invoke-command to run the script locally, remotely (or) even in a batch control Provide Net wide around Powershell enables you to get around software (or) program limitation especially on a business-wide scale. For example, PowerShell is responsible for reconfiguring the default setting of a program across the entire network This might be useful if the business wants to roll a specific protocol to all its users using two-factor authentication (2FA) (or) change their passwords for every months. Scale your efforts across devices: Powershell can be a lifesaver if you want to run scripts across multiple computers, especially if some of them were remote devices. For an instance, if you are trying to implement a solution in a few devices, (or) servers at once, where you don’t have to log in on multiple servers at once. Moreover, this PowerShell is responsible to gather information across multiple devices at once and allows you to install updates, configure settings, gather the information that saves you hours of work and travel time Gain Visibility into information: The advantage of this platform is the accessibility of the computer file system. Powershell makes it hard to find data in files and the windows registry. Moreover, digital certificates are visible whether it is housed on one computer (or) many. And it allows you to export the data for reporting purposes. What you can do with the power shell? GUI’s are the form of wrapper that is responsible for running the code for certain actions like clicking the buttons. Here the underlying GUI codes need to the written for the GUI to function. With the utilization of power shellcode, companies can roll out the changes and updates and can test the GUI. Besides, it is tightly integrated with most of the Microsoft products. In some cases, products like Microsoft server 2016 and office 365 things cannot be done with GUI and only the power shell can do.   Microsoft people have designed this tool as an open-source and cross-platform. And it incorporated its capabilities into several interfaces. This power shell has become a robust solution to automate a range of tedious (or) administrative tasks and then find the filter and export the information about the computer on a network. It does this by combining the commands called cmdlets and create scripts. For IT professionals like MSP, it makes sense to utilize the text-based command-line interfaces(CLI’s) to achieve more granular control over system management. Within the power shell, you can leverage the improved power shell access and control over the windows management instrumentation and the component object model to fine-tune the administrative management.  This automation tool is greatly helpful for executing a typical management task.  Besides, this power shell includes adding and deleting accounts, editing groups, and creating a list to view specific types of users (or) groups. Besides, this powerful tool has an integrated scripting environment (ISE), a graphic user interface that lets you run commands and create (or) test scripts. This interface lets you develop the scripts such as command collection, where you can add the logic for execution. This is particularly useful for system administrators who need to run the command sequences for system configuration. Likewise, there are multiple uses of power shell in the real-time industry. By reaching the end of this article, I hope you people have gained the best knowledge on power shell. You people can get more practical knowledge on PowerShell taught by real-time experts at power shell online Course. In the upcoming articles of this blog, I'll be sharing the details of more information on PowerShell.  

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What is Application Packaging?

During 1990, application profiling team members used to write scripts to wrap the applications into packages. Its good to write these scripts if it is small. But in the case of large files, it becomes more and more complex.  Moreover, there might be some dependencies like platforms, pre-required software to execute those scripts. So while installing any kind of software, you need to take care of all these factors. Hence to get rid of all these factors, the operation team uses the application packaging. So, What is Application packaging? Application packaging is the way for enterprises and large organizations to standardize and streamline the way of software on user devices. This process involves creating an application package for each piece of software that the business requires with the predefined system and user setting that is suitable for the specific standards and the control set within the organization. This allows the IT administrators to deliver the latest version of the software with new features as well as the security updated in a consistent and timely manner to gain a competitive advantage.  Besides it also reduces the total management cost. Here the IT team does not have to troubleshoot the individual devices but can package, test, and troubleshoot on a global level. This application packaging is the core component of the company’s software management strategy. This involves binding the set of files, registry as well as components to create a customized software installation targeted for automated deployment. A package usually includes the additional setting and the scripts for the software to install on many devices in a single click without any interaction from the user. This package can be remotely installed with the help of deployment management systems such as SCCM, Intune, DMS Console, etc. What are the stages of application packaging? Every process here has a few stages as follows:  In the initial stage, the request to start the process of packaging is raised. The technical evaluation of a particular source is done. In this stage, packaging involves the process of capture, editing, and testing. In this stage, the package quality is taken into consideration and a full proof test is done In the final stage, the user acceptance test (or) UAT is the last stage of this process. What type of packaging formats exists? There are many types of packing formats that exist. Some of them are MSI, MSIX, appv, cloud house, thin app. Get practical knowledge on creating different packages by a real-time industry professional at Application packaging Online Training. a)Microsoft Installer and MSI : When Microsoft installer was launched in 1999, it provides the framework for the installation process. Here the installers could recognize each other and have a database of installed products and will introduce a consistency that had not existed before. Using an MSI File, you can install both .exe and the registry keys, specify the file locations, create custom actions that were not part of the standard install, etc. This MSI’s delivers greater control, efficiency, and the speed to process and deploy the packaging apps. Through all the version of windows since windows 2000, enterprises have been creating the MSI’s for their application needs and deploy them in the same way for the past 20 years. Before creating the application package, the new application package, needs to be tested on each version of Windows that you are running and other apps as well to check the conflicts. If any issues were found during the testing then it needs to be fixed. Once this is done, it needs to be repackaged and redeployed again. If any of the testing/ packaging/ deploying takes a long time, then it's better to take another alternative. b)Virtualization changes the Application packaging: SoftGrid has changed the legacy set of issues and created the rise of application virtualization. The operation team realized that the use of COM isolation and the virtual file system is capable of preventing problems such as DLL and Conflict hell. This allowed applications to run in parallel on the same desktop without any issues by reducing risk and uncertainty.  In 2006,  Microsoft acquired a soft grid that gives instant access to the best application virtualization technology on the market as well as the large userbase. Microsoft has updated many of its updated features and introduced its security standards before rebranding it. How to package an application? Application packaging is a time-consuming process for every company. This complex task requires conformity with application versions, installation prerequisites, tools as well as the post configuration actions. The standard application package delivery format is a zip archive with the following folder structure: a)Package documentation (packing instructions, discovery documentation, etc) b)Package delivery folder (i.e the set of file need for deployment MSI, Wrapper, MST, CAB, etc ) What are the benefits of application packaging? Application packaging has many benefits. Some of them were: No installed required. Thus no more conflict between the application and OS. It supports multiple runtime environments based on the application requirement. It is capable of supporting multiple version concurrently It lowers the cost of migrations and upgrades. It accelerates application deployment through on-demand application streaming. It helps in application customization to suit the user's needs. It saves a lot of time in installation as well as the uninstallation process. Once the application has packed, the application can also be installed quickly on several laptops in different locations Likewise, there are benefits of application packaging when you pack the application in real-time. By reaching the end of this blog, I hope you people have gained some knowledge of Application packaging. You people can acquire more real-time knowledge of application packaging from the roots at Application packaging online training. In the upcoming post of this blog, I'll be sharing the details of the working of each application package in real-time.

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Interview Questions

Hadoop Cluster Interview Questions

  Q.Explain About The Hadoop-core Configuration Files? Ans: Hadoop core is specified by two resources. It is configured by two well written xml files which are loaded from the classpath: Hadoop-default.xml- Read-only defaults for Hadoop, suitable for a single machine instance. Hadoop-site.xml- It specifies the site configuration for Hadoop distribution. The cluster specific information is also provided by the Hadoop administrator. Q.Explain In Brief The Three Modes In Which Hadoop Can Be Run? Ans : The three modes in which Hadoop can be run are: Standalone (local) mode- No Hadoop daemons running, everything runs on a single Java Virtual machine only. Pseudo-distributed mode- Daemons run on the local machine, thereby simulating a cluster on a smaller scale. Fully distributed mode- Runs on a cluster of machines. Q.Explain What Are The Features Of Standalone (local) Mode? Ans : In stand-alone or local mode there are no Hadoop daemons running,  and everything runs on a single Java process. Hence, we don't get the benefit of distributing the code across a cluster of machines. Since, it has no DFS, it utilizes the local file system. This mode is suitable only for running MapReduce programs by developers during various stages of development. Its the best environment for learning and good for debugging purposes. Q.What Are The Features Of Fully Distributed Mode? Ans:In Fully Distributed mode, the clusters range from a few nodes to 'n' number of nodes. It is used in production environments, where we have thousands of machines in the Hadoop cluster. The daemons of Hadoop run on these clusters. We have to configure separate masters and separate slaves in this distribution, the implementation of which is quite complex. In this configuration, Namenode and Datanode runs on different hosts and there are nodes on which task tracker runs. The root of the distribution is referred as HADOOP_HOME. Q.Explain What Are The Main Features Of Pseudo Mode? Ans : In Pseudo-distributed mode, each Hadoop daemon runs in a separate Java process, as such it simulates a cluster though on a small scale. This mode is used both for development and QA environments. Here, we need to do the configuration changes. Q.What Are The Hadoop Configuration Files At Present? Ans : There are 3 configuration files in Hadoop: conf/core-site.xml: fs.default.name hdfs: //localhost:9000 conf/hdfs-site.xml: dfs.replication 1 conf/mapred-site.xml: mapred.job.tracker local host: 9001 Q.Can You Name Some Companies That Are Using Hadoop? Ans : Numerous companies are using Hadoop, from large Software Companies, MNCs to small organizations. Yahoo is the top contributor with many open source Hadoop Softwares and frameworks. Social Media Companies like Facebook and Twitter have been using for a long time now for storing their mammoth data. Apart from that Netflix, IBM, Adobe and e-commerce websites like Amazon and eBay are also using multiple Hadoop technologies. Q.Which Is The Directory Where Hadoop Is Installed? Ans : Cloudera and Apache have the same directory structure. Hadoop is installed in cd /usr/lib/hadoop-0.20/. Q.What Are The Port Numbers Of Name Node, Job Tracker And Task Tracker? Ans : The port number for Namenode is ’70′, for job tracker is ’30′ and for task tracker is ’60′. Q.Tell Us What Is A Spill Factor With Respect To The Ram? Ans : Spill factor is the size after which your files move to the temp file. Hadoop-temp directory is used for this. Default value for io.sort.spill.percent is 0.80. A value less than 0.5 is not recommended. Q.Is Fs.mapr.working.for A Single Directory? Ans : Yes, fs.mapr.working.dir it is just one directory. Q.Which Are The Three Main Hdfs-site.xml Properties? Ans : The three main hdfs-site.xml properties are: name.dir which gives you the location on which metadata will be stored and where DFS is located – on disk or onto the remote. data.dir which gives you the location where the data is going to be stored. checkpoint.dir which is for secondary Namenode. Q.How To Come Out Of The Insert Mode? Ans : To come out of the insert mode, press ESC, Type: q (if you have not written anything) OR Type: wq (if you have written anything in the file) and then press ENTER. Q.Tell Us What Cloudera Is And Why It Is Used In Big Data? Ans : Cloudera is the leading Hadoop distribution vendor on the Big Data market, its termed as the next-generation data management software that is required for business critical data challenges that includes access, storage, management, business analytics, systems security, and search. Q.We Are Using Ubuntu Operating System With Cloudera, But From Where We Can Download Hadoop Or Does It Come By Default With Ubuntu? Ans : This is a default configuration of Hadoop that you have to download from Cloudera or from eureka’s Dropbox and the run it on your systems. You can also proceed with your own configuration but you need a Linux box, be it Ubuntu or Red hat. There are installations steps present at the Cloudera location or in Eureka’s Drop box. You can go either ways. Q.What Is The Main Function Of The ‘jps’ Command? Ans : The jps’ command checks whether the Datanode, Namenode, tasktracker, jobtracker, and other components are working or not in Hadoop. One thing to remember is that if you have started Hadoop services with sudo then you need to run JPS with sudo privileges else the status will be not shown. Q.How Can I Restart Namenode? Ans : Click on stop-all.sh and then click on start-all.sh OR Write sudo hdfs (press enter), su-hdfs (press enter), /etc/init.d/ha (press enter) and then /etc/init.d/hadoop-0.20-namenode start (press enter). Q.How Can We Check Whether Namenode Is Working Or Not? Ans : To check whether Namenode is working or not, use the command /etc/init.d/hadoop- 0.20-namenode status or as simple as jps’. Q.What Is "fsck" And What Is Its Use? Ans : "fsck" is File System Check. FSCK is used to check the health of a Hadoop Filesystem. It generates a summarized report of the overall health of the filesystem. Usage:  hadoop fsck / Q.At Times You Get A ‘connection Refused Java Exception’ When You Run The File System Check Command Hadoop Fsck /? Ans : The most possible reason is that the Namenode is not working on your VM. Q.What Is The Use Of The Command Mapred.job.tracker? Ans : The command mapred.job.tracker is used by the Job Tracker to list out which host and port that the MapReduce job tracker runs at. If it is "local", then jobs are run in-process as a single map and reduce task. Q.What Does /etc /init.d Do? Ans : /etc /init.d specifies where daemons (services) are placed or to see the status of these daemons. It is very LINUX specific, and nothing to do with Hadoop. Q.How Can We Look For The Namenode In The Browser? Ans : If you have to look for Namenode in the browser, you don’t have to give localhost: 8021, the port number to look for Namenode in the browser is 50070. Q.How To Change From Su To Cloudera? Ans : To change from SU to Cloudera just type exit. Q.Which Files Are Used By The Startup And Shutdown Commands? Ans : Slaves and Masters are used by the startup and the shutdown commands. Q.What Do Masters And Slaves Consist Of? Ans : Masters contain a list of hosts, one per line, that are to host secondary namenode servers. Slaves consist of a list of hosts, one per line, that host datanode and task tracker servers. Q.What Is The Function Of Hadoop-env.sh? Where Is It Present? Ans : This file contains some environment variable settings used by Hadoop; it provides the environment for Hadoop to run. The path of JAVA_HOME is set here for it to run properly. Hadoop-env.sh file is present in the conf/hadoop-env.sh location. You can also create your own custom configuration file conf/hadoop-user-env.sh, which will allow you to override the default Hadoop settings. Q.Can We Have Multiple Entries In The Master Files? Ans : Yes, we can have multiple entries in the Master files. Q.In Hadoop_pid_dir, What Does Pid Stands For? Ans : PID stands for ‘Process ID’. Q.What Does Hadoop-metrics? Properties File Do? Ans : Hadoop-metrics Properties is used for ‘Reporting‘purposes. It controls the reporting for hadoop. The default status is ‘not to report‘. Q.What Are The Network Requirements For Hadoop? Ans : The Hadoop core uses Shell (SSH) to launch the server processes on the slave nodes. It requires password-less SSH connection between the master and all the slaves and the Secondary machines. Q.Why Do We Need A Password-less Ssh In Fully Distributed Environment? Ans : We need a password-less SSH in a Fully-Distributed environment because when the cluster is LIVE and running in Fully Distributed environment, the communication is too frequent. The job tracker should be able to send a task to task tracker quickly. Q.What Will Happen If A Namenode Has No Data? Ans : If a Namenode has no data it cannot be considered as a Namenode. In practical terms, Namenode needs to have some data. Q.What Happens To Job Tracker When Namenode Is Down? Ans : Namenode is the main point which keeps all the metadata, keep tracks of failure of datanode with the help of heart beats. As such when a namenode is down, your cluster will be completely down, because Namenode is the single point of failure in a Hadoop Installation. Q.Explain What Do You Mean By Formatting Of The Dfs? Ans : Like we do in Windows, DFS is formatted for proper structuring of data. It is not usually recommended to do as it format the Namenode too in the process, which is not desired. Q.We Use Unix Variants For Hadoop. Can We Use Microsoft Windows For The Same? Ans : In practicality, Ubuntu and Red Hat Linux are the best Operating Systems for Hadoop. On the other hand, Windows can be used but it is not used frequently for installing Hadoop as there are many support problems related to it. The frequency of crashes and the subsequent restarts makes it unattractive. As such, Windows is not recommended as a preferred environment for Hadoop Installation, though users can give it a try for learning purposes in the initial stage. Q.Which One Decides The Input Split - Hdfs Client Or Namenode? Ans : The HDFS Client does not decide. It is already specified in one of the configurations through which input split is already configured. Q.Let’s Take A Scenario, Let’s Say We Have Already Cloudera In A Cluster, Now If We Want To Form A Cluster On Ubuntu Can We Do It. Explain In Brief? Ans : Yes, we can definitely do it. We have all the useful installation steps for creating a new cluster. The only thing that needs to be done is to uninstall the present cluster and install the new cluster in the targeted environment. Q.Can You Tell Me If We Can Create A Hadoop Cluster From Scratch? Ans : Yes, we can definitely do that.  Once we become familiar with the Apache Hadoop environment, we can create a cluster from scratch. Q.Explain The Significance Of Ssh? What Is The Port On Which Port Does Ssh Work? Why Do We Need Password In Ssh Local Host? Ans : SSH is a secure shell communication, is a secure protocol and the most common way of administering remote servers safely, relatively very simple and inexpensive to implement. A single SSH connection can host multiple channels and hence can transfer data in both directions. SSH works on Port No. 22, and it is the default port number. However, it can be configured to point to a new port number, but its not recommended. In local host, password is required in SSH for security and in a situation where password less communication is not set. Q.What Is Ssh? Explain In Detail About Ssh Communication Between Masters And The Slaves? Ans : Secure Socket Shell or SSH is a password-less secure communication that provides administrators with a secure way to access a remote computer and data packets are sent across the slave. This network protocol also has some format into which data is sent across. SSH communication is not only between masters and slaves but also between two hosts in a network.  SSH appeared in 1995 with the introduction of SSH - 1. Now SSH 2 is in use, with the vulnerabilities coming to the fore when Edward Snowden leaked information by decrypting some SSH traffic. Q.Can You Tell Is What Will Happen To A Namenode, When Job Tracker Is Not Up And Running? Ans : When the job tracker is down, it will not be in functional mode, all running jobs will be halted because it is a single point of failure. Your whole cluster will be down but still Namenode will be present. As such the cluster will still be accessible if Namenode is working, even if the job tracker is not up and running. But you cannot run your Hadoop job.  

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Go Language interview Questions

Q.What Is Go? Ans: Go is a general-purpose language designed with systems programming in mind.It was initially developed at Google in year 2007 by Robert Griesemer, Rob Pike, and Ken Thompson. It is strongly and statically typed, provides inbuilt support for garbage collection and supports concurrent programming. Programs are constructed using packages, for efficient management of dependencies. Go programming implementations use a traditional compile and link model to generate executable binaries. Q.What Are The Benefits Of Using Go Programming? Ans: Support for environment adopting patterns similar to dynamic languages. For example type inference (x := 0 is valid declaration of a variable x of type int). Compilation time is fast. InBuilt concurrency support: light-weight processes (via goroutines), channels, select statement. Conciseness, Simplicity, and Safety. Support for Interfaces and Type embdding. Production of statically linked native binaries without external dependencies. Q.Does Go Support Type Inheritance? Ans: No support for type inheritance. Q.Does Go Support Operator Overloading? Ans: No support for operator overloading. Q.Does Go Support Method Overloading? Ans: No support for method overloading. Q.Does Go Support Pointer Arithmetics? Ans: No support for pointer arithmetic. Q.Does Go Support Generic Programming? Ans: No support for generic programming. Q.Is Go A Case Sensitive Language? Ans: Yes! Go is a case sensitive programming language. Q.What Is Static Type Declaration Of A Variable In Go? Ans: Static type variable declaration provides assurance to the compiler that there is one variable existing with the given type and name so that compiler proceed for further compilation without needing complete detail about the variable. A variable declaration has its meaning at the time of compilation only, compiler needs actual variable declaration at the time of linking of the program. Q.What Is Dynamic Type Declaration Of A Variable In Go? Ans: A dynamic type variable declaration requires compiler to interpret the type of variable based on value passed to it. Compiler don't need a variable to have type statically as a necessary requirement. Q.Can You Declared Multiple Types Of Variables In Single Declaration In Go? Ans: Yes Variables of different types can be declared in one go using type inference. var a, b, c = 3, 4, "foo" Q.How To Print Type Of A Variable In Go? Ans: Following code prints the type of a variable − var a, b, c = 3, 4, "foo" fmt.Printf("a is of type %Tn", a) Q.What Is A Pointer? Ans: It's a pointer variable which can hold the address of a variable. For example − var x = 5 var p *int p = &x fmt.Printf("x = %d", *p) Here x can be accessed by *p. Q.What Is The Purpose Of Break Statement? Ans: Break terminates the for loop or switch statement and transfers execution to the statement immediately following the for loop or switch. Q.What Is The Purpose Of Continue Statement? Ans: Continue causes the loop to skip the remainder of its body and immediately retest its condition prior to reiterating. Q.What Is The Purpose Of Goto Statement? Ans: goto transfers control to the labeled statement. Q.Explain The Syntax For 'for' Loop? Ans: The syntax of a for loop in Go programming language is − for { statement(s); } Here is the flow of control in a for loop − if condition is available, then for loop executes as long as condition is true. if for clause that is ( init; condition; increment ) is present then The init step is executed first, and only once. This step allows you to declare and initialize any loop control variables. You are not required to put a statement here, as long as a semicolon appears. Next, the condition is evaluated. If it is true, the body of the loop is executed. If it is false, the body of the loop does not execute and flow of control jumps to the next statement just after the for loop. After the body of the for loop executes, the flow of control jumps back up to the increment statement. This statement allows you to update any loop control variables. This statement can be left blank, as long as a semicolon appears after the condition. The condition is now evaluated again. If it is true, the loop executes and the process repeats itself (body of loop, then increment step, and then again condition). After the condition becomes false, the for loop terminates. if range is available, then for loop executes for each item in the range. Q.Explain The Syntax To Create A Function In Go? Ans: The general form of a function definition in Go programming language is as follows − func function_name( ) { body of the function } A function definition in Go programming language consists of a function header and a function body. Here are all the parts of a function − func func starts the declaration of a function. Function Name − This is the actual name of the function. The function name and the parameter list together constitute the function signature. Parameters − A parameter is like a placeholder. When a function is invoked, you pass a value to the parameter. This value is referred to as actual parameter or argument. The parameter list refers to the type, order, and number of the parameters of a function. Parameters are optional; that is, a function may contain no parameters. Return Type − A function may return a list of values. The return_types is the list of data types of the values the function returns. Some functions perform the desired operations without returning a value. In this case, the return_type is the not required. Function Body − The function body contains a collection of statements that define what the function does. Q.Can You Return Multiple Values From A Function? Ans: A Go function can return multiple values. For example − package main import "fmt" func swap(x, y string) (string, string) { return y, x } func main() { a, b := swap("Mahesh", "Kumar") fmt.Println(a, b) } Q.In How Many Ways You Can Pass Parameters To A Method? Ans: While calling a function, there are two ways that arguments can be passed to a function: Call by value: This method copies the actual value of an argument into the formal parameter of the function. In this case, changes made to the parameter inside the function have no effect on the argument. Call by reference:This method copies the address of an argument into the formal parameter. Inside the function, the address is used to access the actual argument used in the call. This means that changes made to the parameter affect the argument. Q.What Is The Default Way Of Passing Parameters To A Function? Ans: By default, Go uses call by value to pass arguments. In general, this means that code within a function cannot alter the arguments used to call the function while calling max() function used the same method. Q.What Do You Mean By Function As Value In Go? Ans: Go programming language provides flexibility to create functions on the fly and use them as values. We can set a variable with a function definition and use it as parameter to a function. Q.What Are The Function Closures? Ans: Functions closure are anonymous functions and can be used in dynamic programming. Q.What Are Methods In Go? Ans: Go programming language supports special types of functions called methods. In method declaration syntax, a "receiver" is present to represent the container of the function. This receiver can be used to call function using "." operator. Q.What Is Default Value Of A Local Variable In Go? Ans: A local variable has default value as it corresponding 0 value. Q.What Is Default Value Of A Global Variable In Go? Ans: A global variable has default value as it corresponding 0 value. Q.What Is Default Value Of A Pointer Variable In Go? Ans: Pointer is initialized to nil. Q.Explain The Purpose Of The Function Printf()? Ans: Prints the formatted output. Q.What Is Lvalue And Rvalue? Ans: The expression appearing on right side of the assignment operator is called as rvalue. Rvalue is assigned to lvalue, which appears on left side of the assignment operator. The lvalue should designate to a variable not a constant. Q.What Is The Difference Between Actual And Formal Parameters? Ans: The parameters sent to the function at calling end are called as actual parameters while at the receiving of the function definition called as formal parameters. Q.What Is The Difference Between Variable Declaration And Variable Definition? Ans: Declaration associates type to the variable whereas definition gives the value to the variable. Q.Explain Modular Programming? Ans: Dividing the program in to sub programs (modules/function) to achieve the given task is modular approach. More generic functions definition gives the ability to re-use the functions, such as built-in library functions. Q.What Is A Token? Ans: A Go program consists of various tokens and a token is either a keyword, an identifier, a constant, a string literal, or a symbol. Q.Which Key Word Is Used To Perform Unconditional Branching? Ans: goto Q.What Is An Array? Ans: Array is collection of similar data items under a common name. Q.What Is A Nil Pointers In Go? Ans: Go compiler assign a Nil value to a pointer variable in case you do not have exact address to be assigned. This is done at the time of variable declaration. A pointer that is assigned nil is called a nil pointer. The nil pointer is a constant with a value of zero defined in several standard libraries. Q.What Is A Pointer On Pointer? Ans: It's a pointer variable which can hold the address of another pointer variable. It de-refers twice to point to the data held by the designated pointer variable. var a int var ptr *int var pptr **int a = 3000 ptr = &a pptr = &ptr fmt.Printf("Value available at **pptr = %dn", **pptr) Therefore 'a' can be accessed by **pptr. Q.What Is Structure In Go? Ans: Structure is another user defined data type available in Go programming, which allows you to combine data items of different kinds. Q.How To Define A Structure In Go? Ans: To define a structure, you must use type and struct statements. The struct statement defines a new data type, with more than one member for your program. type statement binds a name with the type which is struct in our case. The format of the struct statement is this − type struct_variable_type struct { member definition; member definition; ... member definition; } Q.What Is Slice In Go? Ans: Go Slice is an abstraction over Go Array. As Go Array allows you to define type of variables that can hold several data items of the same kind but it do not provide any inbuilt method to increase size of it dynamically or get a sub-array of its own. Slices covers this limitation. It provides many utility functions required on Array and is widely used in Go programming. Q.How To Define A Slice In Go? Ans: To define a slice, you can declare it as an array without specifying size or use make function to create the one. var numbers int /* a slice of unspecified size */ /* numbers == int{0,0,0,0,0}*/ numbers = make(int,5,5) /* a slice of length 5 and capacity 5*/ Q.How To Get The Count Of Elements Present In A Slice? Ans: len() function returns the elements presents in the slice. Q.What Is The Difference Between Len() And Cap() Functions Of Slice In Go? Ans: len() function returns the elements presents in the slice where cap() function returns the capacity of slice as how many elements it can be accomodate. Q.How To Get A Sub-slice Of A Slice? Ans: Slice allows lower-bound and upper bound to be specified to get the subslice of it using. Q.What Is Range In Go? Ans: The range keyword is used in for loop to iterate over items of an array, slice, channel or map. With array and slices, it returns the index of the item as integer. With maps, it returns the key of the next key-value pair. Q.What Are Maps In Go? Ans: Go provides another important data type map which maps unique keys to values. A key is an object that you use to retrieve a value at a later date. Given a key and a value, you can strore the value in a Map object. After value is stored, you can retrieve it by using its key. Q.How To Create A Map In Go? Ans: You must use make function to create a map. /* declare a variable, by default map will be nil*/ var map_variable mapvalue_data_type /* define the map as nil map can not be assigned any value*/ map_variable = make(mapvalue_data_type) Q.How To Delete An Entry From A Map In Go? Ans: delete() function is used to delete an entry from the map. It requires map and corresponding key which is to be deleted. Q.What Is Type Casting In Go? Ans: Type casting is a way to convert a variable from one data type to another data type. For example, if you want to store a long value into a simple integer then you can type cast long to int. You can convert values from one type to another using the cast operator as following: type_name(expression) Q.What Are Interfaces In Go? Ans: Go programming provides another data type called interfaces which represents a set of method signatures. struct data type implements these interfaces to have method definitions for the method signature of the interfaces. Contact for more on Go Language Online Training  

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CCSA Interview Questions

 Q.Where You Can View The Results Of The Checkpoint? Ans: You can view the results of the checkpoints in the Test Result Window. Note: If you want to retrieve the return value of a checkpoint (a boolean value that indicates whether the checkpoint passed or failed) you must add parentheses around the checkpoint argument in the statement in the Expert View. Q.What’s The Standard Checkpoint? Ans: Standard Checkpoints checks the property value of an object in your application or web page. Q.Which Environment Are Supported By Standard Checkpoint? Ans: Standard Checkpoint are supported for all add-in environments. Q.Explain How A Biometric Device Performs In Measuring Metrics, When Attempting To Authenticate Subjects? Ans: False Rejection Rate Crossover Error Rate False Acceptance Rate Q.What’s The Image Checkpoint? Ans: Image Checkpoint check the value of an image in your application or web page. Q.Which Environments Are Supported By Image Checkpoint? Ans: Image Checkpoint are supported only Web environment. Q.What’s The Bitmap Checkpoint? Ans: Bitmap Checkpoint checks the bitmap images in your web page or application. Q.Which Environment Are Supported By Bitmap Checkpoints? Ans: Bitmap checkpoints are supported all add-in environment. Q.What’s The Table Checkpoints? Ans: Table Checkpoint checks the information with in a table. Q.Which Environments Are Supported By Table Checkpoint? Ans: Table Checkpoints are supported only ActiveX environment. Q.What’s The Text Checkpoint? Ans: Text Checkpoint checks that a test string is displayed in the appropriate place in your application or on web page. Q.Which Environment Are Supported By Test Checkpoint? Ans: Text Checkpoint are supported all add-in environments. Q.What Is Stealth Rule In Checkpoint Firewall? Ans: Stealth Rule Protect Checkpoint firewall from direct access any traffic. Its rule should be place on the top of Security rule base. In this rule administrator denied all traffic to access checkpoint firewall. Q.What Is Cleanup Rule In Checkpoint Firewall? Ans: Cleanup rule place at last of the security rule base, Its used to drop all traffic which not match with above rule and Logged. Cleanup rule mainly created for log purpose. In this rule administrator denied all the traffic and enable log. Q.What Is Explicit Rule In Checkpoint Firewall? Ans: Its a rule in ruse base which is manually created by network security administrator that called Explicit rule. Q.What Is 3 Tier Architecture Component Of Checkpoint Firewall? Ans: Smart Console. Security Management. Security Gateway. Q.What Is The Packet Flow Of Checkpoint Firewall? Ans: SAM Database. Address Spoofing. Session Lookup. Policy Lookup. Destination NAT. Route Lookup. Source NAT. Layer 7 Inspection. Q.Explain Which Type Of Business Continuity Plan (bcp) Test Involves Shutting Down A Primary Site, Bringing An Alternate Site On-line, And Moving All Operations To The Alternate Site? Ans: Full interruption. Q.Explain Which Encryption Algorithm Has The Highest Bit Strength? Ans: AES Q.Give An Example For Simple, Physical-access Control? Ans: Lock. Q.Which Of The Following Is Not An Auditing Function That Should Be Performed Regularly? Ans: Reviewing performance logs. Q.Explain How Do Virtual Corporations Maintain Confidentiality? Ans: Encryption. Q.Explain What Type Of Document Contains Information On Alternative Business Locations, It Resources, And Personnel? Ans: Business continuity plan. Q.Explain Which Of The Following Is The Best Method For Managing Users In An Enterprise? Ans: Place them in a centralized Lightweight Directory Access Protocol. Q.What Are Enterprise Business Continuity Plan (bcp)? Ans: Accidental or intentional data deletion Severe weather disasters Minor power outages Q.Explain Which Type Of Business Continuity Plan (bcp) Test Involves Practicing Aspects Of The Bcp, Without Actually Interrupting Operations Or Bringing An Alternate Site On-line? Ans: Simulation. contact for more on Checkpoint firewall online training  

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Chef (Software) Interview Questions

 Q.What Is A Resource? Ans: A resource represents a piece of infrastructure and its desired state, such as a package that should be installed, a service that should be running, or a file that should be generated. Q.What Is A Recipe? Ans: A recipe is a collection of resources that describes a particular configuration or policy. A recipe describes everything that is required to configure part of a system. Recipes do things such as: Install and configure software components. Manage files. Deploy applications. Execute other recipes. Q.What Happens When You Don’t Specify A Resource’s Action? Ans: When you don’t specify a resource’s action, Chef applies the default action. Q.Write A Service Resource That Stops And Then Disables The Httpd Service From Starting When The System Boots? Ans: Service ‘httpd’ do Action End Q.How Does A Cookbook Differ From A Recipe? Ans: A recipe is a collection of resources, and typically configures a software package or some piece of infrastructure. A cookbook groups together recipes and other information in a way that is more manageable than having just recipes alone. For example, in this lesson you used a template resource to manage your HTML home page from an external file. The recipe stated the configuration policy for your web site, and the template file contained the data. You used a cookbook to package both parts up into a single unit that you can later deploy. Q.How Does Chef-apply Differ From Chef-client? Ans: Chef-apply apply a single recipe; chef-client applies a cookbook. For learning purposes, we had you start off with chef-apply because it helps you understand the basics quickly. In practice, chef-apply is useful when you want to quickly test something out. But for production purposes, you typically run chef-client to apply one or more cookbooks. Q.What’s The Run-list? Ans: The run-list lets you specify which recipes to run, and the order in which to run them. The run-list is important for when you have multiple cookbooks, and the order in which they run matters. Q.What Are The Two Ways To Set Up A Chef Server? Ans: Install an instance on your own infrastructure. Use hosted Chef. Q.What’s The Role Of The Starter Kit? Ans: The Starter Kit provides certificates and other files that enable you to securely communicate with the Chef server. Q.What Is A Node? Ans: A node represents a server and is typically a virtual machine, container instance, or physical server – basically any compute resource in your infrastructure that’s managed by Chef. Q.What Information Do You Need To In Order To Bootstrap? Ans: You need: Your node’s host name or public IP address. A user name and password you can log on to your node with. Alternatively, you can use key-based authentication instead of providing a user name and password. Q.What Happens During The Bootstrap Process? Ans: During the bootstrap process, the node downloads and installs chef-client, registers itself with the Chef server, and does an initial check in. During this check in, the node applies any cookbooks that are part of its run-list. Q.Which Of The Following Lets You Verify That Your Node Has Successfully Bootstrapped? Ans: The Chef management console. Knife node list Knife node show You can use all three of these methods. Q.What Is The Command You Use To Upload A Cookbook To The Chef Server? Ans: Knife cookbook upload. Q.How Do You Apply An Updated Cookbook To Your Node? Ans: We mentioned two ways. Run knife Ssh from your workstation. SSH directly into your server and run chef-client. You can also run chef-client as a daemon, or service, to check in with the Chef server on a regular interval, say every 15 or 30 minutes. Update your Apache cookbook to display your node’s host name, platform, total installed memory, and number of CPUs in addition to its FQDN on the home page. Update index.html.erb like this. hello from < /h1> – RAM CPUs Then upload your cookbook and run it on your node. Q. What Would You Set Your Cookbook’s Version To Once It’s Ready To Use In Production? Ans: According to Semantic Versioning, you should set your cookbook’s version number to 1.0.0 at the point it’s ready to use in production. Q. Create A Second Node And Apply The Awesome Customers Cookbook To It. How Long Does It Take? Ans: You already accomplished the majority of the tasks that you need. You wrote the awesome customers cookbook, uploaded it and its dependent cookbooks to the Chef server, applied the awesome customers cookbook to your node, and verified that everything’s working. All you need to do now is: Bring up a second Red Hat Enterprise Linux or Centos node. Copy your secret key file to your second node. Bootstrap your node the same way as before. Because you include the awesome customers cookbook in your run-list, your node will apply that cookbook during the bootstrap process. The result is a second node that’s configured identically to the first one. The process should take far less time because you already did most of the work. Now when you fix an issue or add a new feature, you’ll be able to deploy and verify your update much more quickly! Q. What’s The Value Of Local Development Using Test Kitchen? Ans: Local development with Test Kitchen: Enables you to use a variety of virtualization providers that create virtual machine or container instances locally on your workstation or in the cloud. Enables you to run your cookbooks on servers that resemble those that you use in production. Speeds up the development cycle by automatically provisioning and tearing down temporary instances, resolving cookbook dependencies, and applying your cookbooks to your instances.  

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React JS Interview Questions

What Is Reactjs? Ans: React is an open source JavaScript front end UI library developed by Facebook  for creating interactive, stateful & reusable UI components for web and mobile app. It is used by Facebook, Instagram and many more web apps. ReactJS is used for handling view layer for web and mobile applications. One of React’s unique major points is that  it perform not only on the client side, but also can be rendered on server side, and they can work together inter-operably. Why Reactjs Is Used? Ans: React is used to handle the view part of Mobile application and Web application. Does Reactjs Use Html? Ans: No, It uses JSX which is simiar to HTM. When Reactjs Released? Ans: March 2013 What Is Current Stable Version Of Reactjs? Ans: Version: 15.5 Release on: April 7, 2017 What Are The Life Cycle Of Reactjs? Ans: Initialization State/Property Updates Destruction What Are The Feature Of Reactjs? Ans: JSX: JSX is JavaScript syntax extension. Components : React is all about components. One direction flow: React implements one way data flow which makes it easy to reason about your app What Are The Advantages Of Reactjs? Ans: React uses virtual DOM which is JavaScript object. This will improve apps performance It can be used on client and server side Component and Data patterns improve readability. Can be used with other framework also. How To Embed Two Components In One Component? Ans: import React from 'react'; class App extends React.Component { render() { return ( ); } } class Header extends React.Component { render() { return ( Header ); What Are The Advantages Of Using Reactjs? Ans: Advantages of ReactJS: React uses virtual DOM which is JavaScript object. This improves application performance as JavaScript virtual DOM is faster than the regular DOM. React can be used on client and as well as server side too. Using React increases readability and makes maintainability easier. Component, Data patterns improves readability and thus makes it easier for manitaing larger apps. React can be used with any other framework (Backbone.js, Angular.js) as it is only a view layer. React’s JSX makes it easier to read the code of our component. It’s really very easy to see the layout. How components are interacting, plugged and combined with each other in app. What Are The Limitations Of Reactjs? Ans: Limitations of ReactJS: React is only for view layer of the app so we still need the help of other technologies to get a complete tooling set for development. React is using inline templating and JSX. This can seem awkward to some developers. The library of react  is too  large. Learning curve  for ReactJS may be steep. How To Use Forms In Reactjs? Ans: In React’s virtual DOM, HTML Input element presents an interesting problem. With the others DOM environment, we can  render the input or textarea and thus allows the browser maintain its   state that is (its value). we can then get and set the value implicitly with the DOM API. In HTML, form elements such as , , and itself  maintain their own state and update its state  based on the input provided by user .In React, components’ mutable state is handled by the state property  and is only updated by setState(). HTML and components use the value attribute. HTML checkbox and radio components, checked attribute is used. (within ) components, selected attribute is used for select box. How To Use Events In Reactjs? Ans: React identifies every events so that it must  have common and consistent behavior  across all the browsers. Normally, in normal JavaScript or other frameworks, the onchange event is triggered after we have typed something into a Textfield and then “exited out of it”. In  ReactJS we cannot do it in this way. The explanation is typical and  non-trivial: *” renders an input textbox initialized with the value, “dataValue”. When the user changes the input in text field, the node’s value property will update and change. However, node.getAttribute(‘value’) will still return the value used at initialization time that is dataValue. Form Events: onChange: onChange event  watches input changes and update state accordingly. onInput: It is triggered on input data onSubmit: It is triggered on submit button. Mouse Events: onClick: OnClick of any components event is triggered on. onDoubleClick: onDoubleClick of any components event is triggered on. onMouseMove: onMouseMove of any components, panel event is triggered on. onMouseOver: onMouseOver of any components, panel, divs event is triggered on. Touch Events: onTouchCancel: This event is for canceling an events. onTouchEnd: Time Duration attached to touch of a screen. onTouchMove: Move during touch device . onTouchStart: On touching a device event is generated. Give An Example Of Using Events? Ans: import React from 'react'; import ReactDOM from 'react-dom'; var StepCounter = React.createClass({ getInitialState: function() { return {counter: this.props.initialCounter }; }, handleClick: function() { this.setState({counter: this.state.counter + 1});  }, render: function() { return OnClick Event, Click Here: {this.state.counter }; } }); ReactDOM.render(< StepCounter initialCounter={7}/>, document.getElementById('content')); Explain Various Flux Elements Including Action, Dispatcher, Store And View? Ans: Flux can be better explained by defining its individual components: Actions– They are helper methods that facilitate passing data to the Dispatcher. Dispatcher– It is Central hub of app, it receives actions and broadcasts payloads to registered callbacks. Stores– It is said to be Containers for application state & logic that have callbacks registered to the dispatcher. Every store maintains particular state and it will update  when it is needed. It wakes up on a relevant dispatch to retrieve the requested data. It is accomplished by registering with the dispatcher  when constructed. They are  similar to  model in a traditional MVC (Model View Controller), but they manage the state of many objects —  it does not represent a single record of data like ORM models do. Controller Views– React Components  grabs the state from Stores and pass it down through props to child components to view to render application. What Is Flux Concept In Reactjs? Ans: Flux is the architecture of an application that Facebook uses for developing client-side web applications. Facebook uses internally when working with React. It is not a framework or a library. This is simply a new technique that complements React and the concept of Unidirectional Data Flow. Facebook dispatcher library is a sort of global pub/sub handler technique which broadcasts payloads to registered callbacks. Give An Example Of Both Stateless And Stateful Components With Source Code? Ans: Stateless and Stateful components Stateless: When a component is “stateless”, it calculates state is calculated internally but it directly  never mutates it. With the same inputs, it will always produce the same output. It means it has no knowledge of the past, current or future state changes. var React = require('react'); var Header = React.createClass({ render: function() { return(   ); } }); ReactDOM.render(, document.body); Stateful : When a component is “stateful”, it is a central point that stores every information in memory about the app/component’s state, do has the ability to change it. It has knowledge of past, current and potential future state changes. Stateful component  change the state, using this.setState method. var React = require('react'); var Header = React.createClass({ getInitialState: function() { return { imageSource: "header.png" }; }, changeImage: function() { this.setState({imageSource: "changeheader.png"}); }, render: function() { return( ); } }); module.exports = Header; Explain Basic Code Snippet Of Jsx With The Help Of A Practical Example? Ans: Your browsers does not understand JSX code natively, we need to convert it to JavaScript first which can be understand by our browsers. We have aplugin which handles including Babel 5’s in-browser ES6 and JSX transformer called browser.js. Babel will understand and recognize JSX code in tags and transform/convert it to normal JavaScript code. In case of production we will need to pre-compile our JSX code into JS before deploying to production environment so that our app renders faster. My First React JSX Example var HelloWorld = React.createClass({ render: function() { return ( Hello, World ) } }); ReactDOM.render( , document.getElementById('hello-world')); What Are The Advantages Of Using Jsx? Ans: JSX is completely optional and its not mandatory, we don’t need to use it in order to use React, but it has several advantages  and a lot of nice features in JSX. JSX is always faster as it performs optimization while compiling code to vanilla JavaScript. JSX is also type-safe, means it is strictly typed  and most of the errors can be caught during compilation of the JSX code to JavaScript. JSX always makes it easier and faster to write templates if we are familiar with HTML syntax. What Is Reactjs-jsx? Ans: JSX (JavaScript XML), lets us to build DOM nodes with HTML-like syntax. JSX is a preprocessor step which adds XML syntax to JavaScript. Like XML, JSX tags have a tag name, attributes, and children JSX also has the same. If an attribute/property value is enclosed in quotes(“”), the value is said to be string. Otherwise, wrap the value in braces and the value is the enclosed JavaScript expression. We can represent JSX as . What Are Components In Reactjs? Ans: React encourages the idea of reusable components. They are widgets or other parts of a layout (a form, a button, or anything that can be marked up using HTML) that you can reuse multiple times in your web application. ReactJS enables us to create components by invoking the React.createClass() method  features a render() method which is responsible for displaying the HTML code. When designing interfaces, we have to break down the individual design elements (buttons, form fields, layout components, etc.) into reusable components with well-defined interfaces. That way, the next time we need to build some UI, we can write much less code. This means faster development time, fewer bugs, and fewer bytes down the wire. How To Apply Validation On Props In Reactjs? Ans: When the application is running in development mode, React will automatically check  for all props that we set on components to make sure they must right correct and right data type. For instance, if we say a component has a Message prop which is a string and is required, React will automatically check and warn  if it gets invalid string or number or boolean objects. For performance reasons this check is only done on dev environments  and on production it is disabled so that rendering of objects is done in fast manner . Warning messages are generated   easily  using a set of predefined options such as: PropTypes.string PropTypes.number PropTypes.func PropTypes.node PropTypes.bool What Are State And Props In Reactjs? Ans: State is the place where the data comes from. We must follow approach  to make our state as simple as possible and minimize number of stateful components. For example, ten components that need data from the state, we should create one container component that will keep the state for all of them. The state starts with a default value and when a Component mounts and then suffers from mutations in time (basically generated from user events). A Component manages its own state internally, but—besides setting an initial state—has no business fiddling with the stateof its children. You could say the state is private. import React from 'react'; import ReactDOM from 'react-dom'; var StepCounter = React.createClass({ getInitialState: function() { return {counter: this.props.initialCount}; }, handleClick: function() { this.setState({counter: this.state. counter + 1}); }, render: function() { return {this.state.counter }; } }); ReactDOM.render(< StepCounter initialCount={7}/>, document.getElementById('content')); Props: They are immutable, this is why container component should define state that can be updated and changed. It is used to pass data down from our view-controller(our top level component). When we need immutable data in our component we can just add props to reactDOM.render() function. import React from 'react'; import ReactDOM from 'react-dom'; class PropsApp extends React.Component { render() { return ( {this.props.headerProperty} {this.props.contentProperty} ); } } ReactDOM.render(, document.getElementById('app')); } What Is The Difference Between The State And Props In Reactjs? Ans: Props: Passes in from parent component.This properties are being read by  PropsApp component and sent to ReactDOM View. State: Created inside component by getInitialState.this.state reads the property of component and update its value it by this.setState() method and then returns to ReactDOM view.State is private within the component. What Are The Benefits Of Redux? Ans: Maintainability: Maintenance of Redux becomes easier due to strict code structure and organisation. Organization: Code organisation is very strict hence the stability of the code is high which intern increases the work to be much easier. Server rendering: This is useful, particularly to the preliminary render, which keeps up a better user experience or search engine optimization. The server-side created stores are forwarded to the client side. Developer tools: It is Highly traceable so changes in position and changes in the application all such instances make the developers have a real-time experience. Ease of testing: The first rule of writing testable code is to write small functions that do only one thing and that are independent. Redux’s code is made of functions that used to be: small, pure and isolated. How Distinct From Mvc And Flux? Ans: As far as MVC structure is concerned the data, presentation and logical layers are well separated and handled. here change to an application even at a smaller position may involve a lot of changes through the application. this happens because data flow exists bidirectional as far as MVC is concerned. Maintenance of MVC structures are hardly complex and Debugging also expects a lot of experience for it. Flux stands closely related to redux. A story based strategy allows capturing the changes applied to the application state, the event subscription, and the current state are connected by means of components. Call back payloads are broadcasted by means of Redux. What Are Functional Programming Concepts? Ans: The various functional programming concepts used to structure Redux are listed below: Functions are treated as First class objects. Capable to pass functions in the format of arguments. Capable to control flow using, recursions, functions and arrays. helper functions such as reduce and map filter are used. allows linking functions together. The state doesn’t change. Prioritize the order of executing the code is not really necessary. What Is Redux Change Of State? Ans: For a release of an action, a change in state to an application is applied, this ensures an intent to change the state will be achieved. Example: The user clicks a button in the application. A function is called in the form of component So now an action gets dispatched by the relative container. This happens because the prop (which was just called in the container) is tied to an action dispatcher using mapDispatchToProps (in the container). Reducer on capturing the action it intern executes a function and this function returns a new state with specific changes. The state change is known by the container and modifies a specific prop in the component as a result of the mapStateToProps function. Where Can Redux Be Used? Ans: Redux is majorly used is a combination with reacting. it also has the ability to get used with other view libraries too. some of the famous entities like AngularJS, Vue.js, and Meteor. can get combined with Redux easily. This is a key reason for the popularity of Redux in its ecosystem. So many articles, tutorials, middleware, tools, and boilerplates are available. What Is The Typical Flow Of Data In A React + Redux App? Ans: Call-back from UI component dispatches an action with a payload, these dispatched actions are intercepted and received by the reducers. this interception will generate a new application state. from here the actions will be propagated down through a hierarchy of components from Redux store. The below diagram depicts the entity structure of a redux+react setup. What Is Store In Redux? Ans: The store holds the application state and supplies the helper methods for accessing the state are register listeners and dispatch actions. There is only one Store while using Redux. The store is configured via the create Store function. The single store represents the entire state.Reducers return a state via action export function configureStore(initialState) { return createStore(rootReducer, initialState); } The root reducer is a collection of all reducers in the application. const root Reducer = combineReducers({ donors: donor Reducer, }); Explain Reducers In Redux? Ans: The state of a store is updated by means of reducer functions. A stable collection of a reducers form a store and each of the stores maintains a separate state associated for itself. To update the array of donors, we should define donor application Reducer as follows. export default function donorReducer(state = , action) { switch (action.type) { case actionTypes.addDonor: return ; default: return state; } } The initial state and action are received by the reducers. Based on the action type, it returns a new state for the store. The state maintained by reducers are immutable. The below-given reducer it holds the current state and action as an argument for it and then returns the next state:function handelingAuthentication(st, actn) { return _.assign({}, st, { auth: actn.pyload }); } What Are Redux Workflow Features? Ans: Reset: Allow to reset the state of the store Revert: Roll back to the last committed state Sweep: All disabled actions that you might have fired by mistake will be removed Commit: It makes the current state the initial state Explain Action’s In Redux? Ans: Actions in Redux are functions which return an action object. The action type and the action data are packed in the action object. which also allows a donor to be added to the system. Actions send data between the store and application. All information’s retrieved by the store are produced by the actions. export function addDonorAction(donor) { return { type: actionTypes.add Donor, donor, }; } Internal Actions are built on top of Javascript objects and associate a type property to it. Click here to add your own text

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