Microsoft Microsoft Certifications AZ-400 Questions & Answers

• Question 191:

  You have a project in Azure DevOps named Project1 that references an Azure Artifacts feed named Feed1. You have a package named Package1 that has the versions shown in the following table.

  

  You need to perform a build of Project1.

  Which version of Package1 will be used?

  A. 1.0.3

  B. 1.4.0

  C. 2.0.0

  D. 2.3.1

  Correct Answer: C

  Reference: https://learn.microsoft.com/en-us/azure/devops/artifacts/concepts/upstream-sources

• Question 192:

  You use Azure Pipelines to build and test code projects.

  You notice an increase in cycle times.

  You need to identify whether agent pool exhaustion is causing the issue.

  What are two possible ways to achieve this goal? Each correct answer presents a complete solution.

  NOTE: Each correct selection is worth one point.

  A. Query the PipelineRun/PipelineRunsendpoint.

  B. Query the TaskAgentPoolSizeSnapshotsendpoint.

  C. View the Pipeline duration report.

  D. View the pool consumption report at the organization level.

  Correct Answer: BD

  B: TaskAgentPoolSizeSnapshot/TaskAgentPoolSizeSnapshots (Composite)

  Supports understanding of pool size, pipeline jobs, and concurrency. The Historical graph for agent pools illustrates how this entity set can be used.

  D: The pool consumption report enables you to view jobs running in your agent pools graphed with agent pool job concurrency over a span of up to 30 days. You can use this information to help decide whether your jobs aren't running

  because of concurrency limits. If you have many jobs queued or running jobs at the concurrency or online agents limit, you may wish to purchase additional parallel jobs or provision more self-hosted agents.

  Report scope

  The pool consumption report can be displayed at organization scope, or project scope. At the organization level, the chart is plotted using data from pipelines across any project within the organization that have run jobs in that pool. At the

  project level, the chart is plotted using data from pipelines in that particular project that have run jobs in that pool.

  Incorrect:

  Not A: PipelineRun/

  PipelineRuns

  Execution information for pipelines. For a sample report, see Pipeline pass rate trend sample report.

  Not C: The Pipeline duration report shows how long your pipeline typically takes to complete successfully. You can review the duration trend and analyze the top tasks by duration to optimize the duration of the pipeline.

  Reference: https://learn.microsoft.com/en-us/azure/devops/pipelines/agents/pool-consumption-report https://github.com/MicrosoftDocs/azure-devops-docs/blob/main/docs/report/extend-analytics/data-model-analytics-service.md

• Question 193:

  You have an app named App1 that you release by using Azure Pipelines. App1 has the versions shown in the following table.

  

  You complete a code change to fix a bug that was introduced in version 3.4.3. Which version number should you assign to the release?

  A. 3.4.4

  B. 3.4.8

  C. 3.5.0

  D. 4.0.1

  Correct Answer: D

  In short semantic versioning, is denoted by X.Y.Z where X is the major version, Y is a minor version, and Z is the patch.

  Reference: https://ychetankumarsarma.medium.com/build-versioning-in-azure-devops-pipelines-94b5a79f80a0

• Question 194:

  You are automating the testing process for your company. You need to automate UI testing of a web application. Which framework should you use?

  A. JaCoco

  B. Playwright

  C. Xamarin.UITest

  D. Microsoft.CodeAnalysis

  Correct Answer: B

  Playwright enables reliable end-to-end testing for modern web apps.

  Any browser • Any platform • One API

  Cross-browser. Playwright supports all modern rendering engines including Chromium, WebKit, and Firefox.

  Cross-platform. Test on Windows, Linux, and macOS, locally or on CI, headless or headed.

  Cross-language. Use the Playwright API in TypeScript, JavaScript, Python, .NET, Java.

  Test Mobile Web. Native mobile emulation of Google Chrome for Android and Mobile Safari. The same rendering engine works on your Desktop and in the Cloud.

  Incorrect:

  *

  JaCoCo

  JaCoCo is an open-source toolkit for measuring code coverage in a code base and reporting it via visual reports. It is quite popular among a variety of code coverage frameworks. It measures line and branch coverage based on the code

  covered by the running unit test cases and provides a visual report, including the highlighted lines of code and the total percentage of code executed in each method. From this analysis, the developer can assess code that has not been

  adequately tested. It's best to focus on areas where coverage is particularly low and try to analyze why this code hasn't been thoroughly tested.

  *

  Xamarin. UITest

  Xamarin. UITest is the Automation Library that allows the NUnit tests to execute on Android and iOS devices. The tests interact with the user interface as a user would: entering text, tapping buttons, and gestures - such as swipes.

  *

  Microsoft.CodeAnalysis

  What is Microsoft code analysis?

  Code quality analysis ("CAxxxx") rules inspect your C# or Visual Basic code for security, performance, design and other issues. Analysis is enabled, by default, for projects that target . NET 5 or later. You can enable code analysis on projects

  that target earlier .

  Reference:

  https://playwright.dev/

• Question 195:

  You have an Azure web app that is deployed by using Azure Pipelines.

  You need to ensure that when a new version of the app is deployed to production, you can roll back to the previous version. The solution must meet the following requirements:

  1.

  Minimize downtime during the deployment.

  2.

  Minimize the time it takes for the rollback.

  What should you use?

  A. a single web app and two deployment slots

  B. a single web app and two deployment pipelines

  C. two web apps and an Azure Standard Load Balancer

  D. two web apps and an Azure Traffic Manager instance

  Correct Answer: A

  When you deploy your web app, web app on Linux, mobile back end, or API app to Azure App Service, you can use a separate deployment slot instead of the default production slot when you're running in the Standard, Premium, or Isolated App Service plan tier. Deployment slots are live apps with their own host names. App content and configurations elements can be swapped between two deployment slots, including the production slot.

  Deploying your application to a non-production slot has the following benefits:

  You can validate app changes in a staging deployment slot before swapping it with the production slot.

  Deploying an app to a slot first and swapping it into production makes sure that all instances of the slot are warmed up before being swapped into production. This eliminates downtime when you deploy your app. The traffic redirection is seamless, and no requests are dropped because of swap operations. You can automate this entire workflow by configuring auto swap when pre-swap validation isn't needed.

  After a swap, the slot with previously staged app now has the previous production app. If the changes swapped into the production slot aren't as you expect, you can perform the same swap immediately to get your "last known good site" back.

  Reference: https://learn.microsoft.com/en-us/azure/app-service/deploy-staging-slots

• Question 196:

  You have an Azure subscription that contains the resources shown in the following table.

  

  DepPipeline1 and ADFPipeline1 use a single credential that is stored in Vault1. You need to configure ADFPipeline1 to retrieve the credential from Vault1. Which type of activity should you use?

  A. Lookup

  B. Get Metadata

  C. Сoрy

  D. Web

  Correct Answer: D

  Use Azure Key Vault secrets in pipeline activities You can store credentials or secret values in an Azure Key Vault and use them during pipeline execution to pass to your activities. Steps

  1.

  Open the properties of your data factory and copy the Managed Identity Application ID value.

  2.

  Open the key vault access policies and add the managed identity permissions to Get and List secrets.

  Click Add, then click Save.

  3.

  Navigate to your Key Vault secret and copy the Secret Identifier.

  Make a note of your secret URI that you want to get during your data factory pipeline run.

  4.

  In your Data Factory pipeline, add a new Web activity and configure it as follows.

  5.

  To use the value in another activity, use the following code expression @activity('Web1').output.value.

  Incorrect:

  Not B: You can use the Get Metadata activity to retrieve the metadata of any data in Azure Data Factory or a Synapse pipeline. You can use the output from the Get Metadata activity in conditional expressions to perform validation, or

  consume the metadata in subsequent activities.

  Reference:

  https://learn.microsoft.com/en-us/azure/data-factory/how-to-use-azure-key-vault-secrets-pipeline-activities

• Question 197:

  You use Azure Repos to manage source code and Azure Pipelines to implement continuous integration and continuous deployment (CI/CD).

  You need to ensure that all comments on pull requests are resolved before the pull requests are included in a build. The solution must minimize administrative effort.

  What should you include in the solution?

  A. a custom action

  B. a post-deployment gate

  C. a branch policy

  D. a pre-deployment gate

  Correct Answer: D

  Gates allow automatic collection of health signals from external services and then promote the release when all the signals are successful or stop the deployment on timeout. Typically, gates are used in connection with incident management,

  problem management, change management, monitoring, and external approval systems.

  Define a gate for a stage

  You can enable gates at the start of a stage (Pre-deployment conditions) or at the end of a stage (Post-deployment conditions) or for both.

  Incorrect:

  * a branch policy

  Branch policies are an important part of the Git workflow and enable you to:

  Isolate work in progress from the completed work in your main branch Guarantee changes build before they get to main Limit who can contribute to specific branches Enforce who can create branches and the naming guidelines for the branches Automatically include the right reviewers for every code change Enforce best practices with required code reviewers

  Reference: https://learn.microsoft.com/en-us/azure/devops/pipelines/release/approvals/gates?view=azure-devops https://learn.microsoft.com/en-us/azure/devops/repos/git/branch-policies-overview

• Question 198:

  You plan to create an image that will contain a .NET Core application.

  You have a Dockerfile file that contains the following code. (Line numbers are included for reference only.)

  

  You need to ensure that the image is as small as possible when the image is built. Which line should you modify in the file?

  A. 1

  B. 3

  C. 4

  D. 7

  Correct Answer: C

• Question 199:

  You have a project in Azure DevOps named Project1. Project1 contains a build pipeline named Pipe1 that builds an application named App1.

  You have an agent pool named Pool1 that contains a Windows Server 2022-based self-hosted agent. Pipe1 uses Pool1.

  You plan to implement another project named Project2. Project2 will have a build pipeline named Pipe2 that builds an application named App2.

  App1 and App2 have conflicting dependencies.

  You need to minimize the possibility that the two build pipelines will conflict with each other. The solution must minimize infrastructure costs.

  What should you do?

  A. Add another self-hosted agent.

  B. Add a Docker Compose task to the build pipelines.

  C. Change the self-hosted agent to use Red Hat Enterprise Linux (RHEL) 9.

  D. Create two container jobs.

  Correct Answer: D

  To get more control over software dependencies and operating system, you can use Container jobs. Note that the decisions whether to run your pipeline inside a container and whether to use a self-hosted agent are independent. You can directly run your pipeline on a self-hosted agent, or inside a container. You can also execute your pipeline in a container on a Microsoft-hosted agent or on a self-hosted agent.

  Incorrect Answers:

  A: For additional control over hardware, you can use a self-hosted build agent.

  Reference: http://thewindowsupdate.com/2019/09/09/resolving-complex-software-and-hardware-dependencies-in-azure-devops-pipelines/

• Question 200:

  You have a project in Azure DevOps named App Project that is used to develop an app named App1. App1Project has an Azure Boards team dashboard that is used to monitor the progress of App1 and track work items.

  You need to track how long it takes to close a work item once work for the item has commenced.

  Which type of widget should you add to the dashboard?

  A. sprint burndown

  B. velocity

  C. lead time

  D. cycle time

  Correct Answer: D

  Reference: https://learn.microsoft.com/en-us/azure/devops/report/dashboards/cycle-time-and-lead-time