AZ-400 Practice Test 5 — 10 Questions

Question 1

Your team is using Git with Azure Repos. A developer accidentally committed a large binary file to the main branch. What is the recommended way to permanently remove it from the repository history?

Accepted Answer

Use 'git filter-branch' to remove the file from history. `git filter-branch` (or its modern replacement `git filter-repo`) rewrites the entire repository history to permanently remove a file from all commits. This is the recommended approach when a large binary file has been committed to the main branch and must be expunged from history to reduce repository size and prevent it from being cloned by others.

Answer

Delete the file and commit the deletion

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Ignore the file using .gitignore

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Revert the commit using 'git revert'

Question 2

You have a multi-stage YAML pipeline that builds and deploys a Node.js application. You want to ensure that the build stage runs only when changes are made to the 'src' folder. Which trigger configuration should you use?

Accepted Answer

Trigger with 'paths' filter. Azure Pipelines supports path-based triggers that allow you to specify which file paths should trigger a pipeline run. By configuring a trigger with a 'paths' filter that includes only the 'src' folder, the build stage will only execute when changes are detected within that specific directory, ignoring changes elsewhere in the repository.

Answer

Trigger with 'batch' set to true

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Trigger with 'branches' filter

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Disable CI trigger and use a scheduled trigger

Question 3

You are implementing a CI pipeline for a Node.js application. The pipeline must run linting, unit tests, and build the application. Which YAML structure is most appropriate?

Accepted Answer

Define one job with multiple steps: lint, test, build.. A CI pipeline for a Node.js application typically runs linting, unit tests, and build sequentially within a single job using multiple steps. This ensures that each step executes in order, sharing the same workspace and environment, which is efficient for a simple CI workflow. Defining separate stages (Option A) or multiple jobs (Option C) adds unnecessary overhead and complexity for tasks that are inherently sequential and do not require independent environments.

Answer

Define three separate stages: lint, test, build.

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Define one job with parallel steps using 'parallel' keyword.

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Define multiple jobs without dependencies.

Question 4

A company recently migrated its CI/CD pipelines from Jenkins to Azure Pipelines. The development team is experiencing frequent build failures due to conflicting changes when multiple developers push code simultaneously. The team wants to maintain a linear history and avoid merge commits. Which strategy should you recommend?

Accepted Answer

Use Team Foundation Version Control (TFVC) with exclusive checkout enabled.. Team Foundation Version Control (TFVC) with exclusive checkout enforces a lock on a file when a developer checks it out, preventing simultaneous edits. This eliminates conflicting changes that cause build failures when multiple developers push code concurrently, and since TFVC does not use merge commits, it maintains a linear history. The scenario explicitly requires avoiding merge commits and resolving conflicts from simultaneous pushes, which TFVC’s exclusive checkout directly addresses.

Answer

Switch to Git with a central repository and require merge commits.

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Enforce a rebase strategy for all pull requests in the branch policy.

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Configure Azure Repos to use squash merge when completing pull requests.

Question 5

Your organization is adopting GitHub Copilot for developers. Which security measure should you implement to ensure that no proprietary code is inadvertently shared with the AI model?

Accepted Answer

Configure content exclusions in the GitHub Copilot settings. GitHub Copilot's content exclusions allow administrators to specify files or repositories that should not be sent to the AI model for code completion suggestions. This prevents proprietary or sensitive code from being transmitted to GitHub's servers, ensuring compliance with security policies. Other options like network segmentation or audit logging do not directly block code from being shared with the AI.

Answer

Use a separate network segment for development

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Disable GitHub Copilot for all users

Answer

Enable audit logging for Copilot usage

Question 6

You are using Microsoft Defender for Cloud to secure Azure Pipelines. You need to receive alerts when a pipeline run uses a service principal with excessive permissions. Which feature should you enable?

Accepted Answer

Enable Microsoft Defender for Cloud's identity and access monitoring.. Microsoft Defender for Cloud's identity and access monitoring continuously assesses the permissions of service principals used in Azure Pipelines and generates alerts when it detects over-privileged or anomalous usage. This feature is specifically designed to identify excessive permissions in real-time, enabling proactive security responses without manual log review or policy enforcement.

Answer

Enable Azure DevOps audit logs and review them manually.

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Create an Azure Policy to deny over-privileged service principals.

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Configure Microsoft Entra ID Conditional Access policies.

Question 7

Your team is using GitHub Actions to deploy a containerized application to Azure Kubernetes Service (AKS). You need to securely authenticate the workflow to AKS without storing credentials in the repository. What should you use?

Accepted Answer

Use OpenID Connect (OIDC) with a federated identity credential.. OpenID Connect (OIDC) allows GitHub Actions to exchange a short-lived token for Azure credentials using a federated identity credential, eliminating the need to store any long-lived secrets in the repository. This is the recommended approach for secure, passwordless authentication to Azure services, including AKS, because it uses token-based authentication that automatically rotates and is scoped to specific workflows.

Answer

Use the GITHUB_TOKEN to authenticate to Azure.

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Use an SSH deploy key to authenticate to AKS.

Answer

Store an Azure service principal password as a GitHub secret.

Question 8

Your Azure DevOps pipeline uses a YAML template that includes a step to push a Docker image to Azure Container Registry. The pipeline fails with 'unauthorized: authentication required'. The service connection uses a workload identity federation. What is the most likely cause?

Accepted Answer

The service principal used by the workload identity does not have the 'acrPush' role. The error 'unauthorized: authentication required' indicates that the Docker client could not authenticate with Azure Container Registry. With workload identity federation, the service principal used by the federated credential must have the 'acrPush' role assigned on the ACR scope to push images. Without this role assignment, the authentication token lacks the necessary permissions, even if the identity itself is valid.

Answer

The Docker image tag contains invalid characters

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The Azure Container Registry name is incorrect

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The service connection secret has expired

Question 9

Which TWO actions should you take to implement a secure build pipeline that uses Azure Key Vault to store secrets? (Choose two.)

Accepted Answer

Grant the Azure DevOps service principal 'Get' and 'List' permissions on the Key Vault.. The Azure DevOps service principal (the identity used by Azure Pipelines) must be granted 'Get' and 'List' permissions on the Key Vault's access policy. This allows the pipeline to retrieve secret values securely without storing credentials in the repository or pipeline configuration. Without these permissions, any attempt to read secrets from the vault will fail with an authorization error.

Answer

Store the Key Vault name and secret names in a secure file in the repository.

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Define secrets as pipeline variables and mark them as secret.

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Use the 'Azure CLI' task to run 'az keyvault secret show' for each secret.

Question 10

The exhibit shows an Azure CLI command to run a pipeline. What does this command do?

Accepted Answer

Runs the pipeline named 'MyPipeline' on the 'main' branch with a variable 'myVar' set to 'value1'.. The Azure CLI command `az pipelines run --name MyPipeline --branch main --variables myVar=value1` triggers an existing pipeline named 'MyPipeline' on the 'main' branch, passing a plain-text variable 'myVar' with the value 'value1'. The `--variables` parameter sets pipeline variables at runtime, but they are not automatically marked as secret; to set a secret variable, you must use the `--secret-variables` parameter instead. This matches option C exactly.

Answer

Runs the pipeline on all branches with the variable.

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Runs the pipeline and sets a secret variable.

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Creates a new pipeline named 'MyPipeline' with a variable.