AZ-400 Practice Test — Free Microsoft Azure DevOps Engineer Expert AZ-400 Questions with Explanations

A team uses Azure Boards and wants to ensure that work items moved to the 'Done' state require a completed code review. What should they configure?

During a sprint review, stakeholders complain that they don't receive notifications about completed work items. The team uses Azure Boards with a custom notification subscription. What is the most likely cause?

A team uses a monorepo with multiple projects in one Git repository. They want to enforce that each commit message must reference a work item from Azure Boards. Which branch policy should they configure?

A company uses Azure DevOps for CI/CD. The security team requires that all pipeline runs must use a specific service connection (ServiceConnection-Prod) that has been approved for production deployments. However, developers are accidentally using unapproved connections. You need to enforce that only the approved service connection can be used in any pipeline that deploys to the production environment. What should you do?

Your organization uses Azure DevOps and Azure Key Vault to manage secrets. You have a pipeline that deploys a web app to Azure App Service. The pipeline uses a variable group linked to Key Vault to retrieve the database connection string. Recently, the build started failing with the error: 'Access to Key Vault is denied. Please ensure the service connection has Get and List permissions on secrets.' The service connection uses a service principal. You have verified that the service principal has the correct Key Vault access policy with Get and List permissions. What is the most likely cause of the failure?

You are configuring Application Insights for a .NET Core web application deployed to Azure App Service. The application must capture telemetry for all HTTP requests, exceptions, and dependency calls with minimal code changes. What should you do?

A team uses Azure Pipelines to build a .NET Core application. The build pipeline runs successfully, but the release pipeline fails when deploying to Azure App Service with the error: 'ERROR_FILE_IN_USE'. What is the most likely cause?

A development team is designing a build pipeline for a microservices application. They want to ensure that each service is built and tested independently, but they also need to run integration tests that span multiple services. What is the recommended approach?

A company uses Azure Pipelines with YAML-based pipelines stored in a Git repository. The pipeline triggers on every push to the main branch, but the team wants to reduce unnecessary builds when only documentation files are changed. What is the best way to achieve this?

A team is implementing a release pipeline for a Node.js application. They want to run integration tests against a temporary environment that is destroyed after the tests complete. Which strategy should they use?

You are reviewing an Azure Policy definition applied to an Azure DevOps project. The project has a build pipeline that deploys to production. What is the effect of this policy on the build pipeline?

Your company has a large monorepo with multiple microservices. You have a single YAML-based Azure Pipeline that builds the entire solution on every commit to the main branch. The pipeline takes over an hour to complete, causing long feedback loops. Developers often submit changes to only one service, but the whole pipeline runs. You need to reduce build time while maintaining quality. You are considering splitting the pipeline into multiple pipelines, each for a service, and using path triggers. However, some services have dependencies on shared libraries that are updated infrequently. You also need to ensure that integration tests that span multiple services still run when necessary. What should you do?

You have a multi-stage YAML pipeline that deploys to Azure Kubernetes Service (AKS). The pipeline uses a deployment job with a strategy of 'runOnce'. You need to ensure that if the deployment fails, the pipeline automatically redeploys the previous successful version. Which strategy should you use instead?

You are designing a build pipeline that produces a NuGet package. The pipeline must conditionally sign the assembly only when the build is triggered by a tag starting with 'v' (e.g., v1.0.0). The pipeline uses a script task that signs the assembly. Which expression should you use in the condition of the script task?

You have a YAML pipeline that deploys to multiple environments. The pipeline uses environment approvals. You need to ensure that the pipeline waits for manual approval before deploying to the production environment. The production environment is named 'Production'. Which configuration should you add to the deployment job?

You are designing a build pipeline that uses a combination of tasks. The pipeline must compile code, run unit tests, and then publish code coverage results. The tasks are: Visual Studio Build, Visual Studio Test, and Publish Code Coverage Results. Which task should be performed first?

Your team uses a monorepo in Azure Repos with multiple feature branches. You notice that merge conflicts frequently occur because developers are working on the same files. You want to reduce conflicts and improve collaboration. Which branching strategy should you recommend?