AZ-400 Design and implement source control Practice Question
This AZ-400 practice question tests your understanding of design and implement source control. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You are a DevOps consultant for a financial services company that is migrating from TFVC to Git. The existing TFVC repository has several branches: main, dev, feature branches, and release branches. The history is linear with no branching. The company requires that all future Git commits follow a strict naming convention: 'type(scope): description' (e.g., 'feat(api): add new endpoint'). They also want to prevent direct commits to the main branch; all changes must go through pull requests with at least one reviewer. Additionally, they want to ensure that each commit message is validated before it is merged. The team is small (5 developers) and they want a simple setup without complex tooling. Which approach should you recommend?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Create a build pipeline that validates commit messages and fails the build if invalid
Why wrong: Can work but requires a build agent; status check is simpler.
B
Use a server-side pre-receive hook in the Git repository
Why wrong: Azure Repos does not support server-side hooks.
C
Install a client-side pre-commit hook on each developer's machine to validate messages
Why wrong: Not enforceable; developers can bypass.
D
Configure branch policies on the main branch: require a minimum of one reviewer, and add a status check that runs a script to validate the commit message format
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure branch policies on the main branch: require a minimum of one reviewer, and add a status check that runs a script to validate the commit message format
Option D is correct because Azure Repos branch policies allow you to enforce pull request requirements (e.g., minimum number of reviewers) and require a status check that runs a custom script to validate commit message format. This ensures all commits merged into main comply with the naming convention and review policy without complex tooling, fitting the small team's need for a simple, server-side enforcement mechanism.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Create a build pipeline that validates commit messages and fails the build if invalid
Why it's wrong here
Can work but requires a build agent; status check is simpler.
✗
Use a server-side pre-receive hook in the Git repository
Why it's wrong here
Azure Repos does not support server-side hooks.
✗
Install a client-side pre-commit hook on each developer's machine to validate messages
Why it's wrong here
Not enforceable; developers can bypass.
✓
Configure branch policies on the main branch: require a minimum of one reviewer, and add a status check that runs a script to validate the commit message format
Why this is correct
Server-side enforcement with minimal overhead.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse client-side hooks (option C) with server-side enforcement, not realizing that client-side hooks are optional and easily bypassed, whereas Azure Repos branch policies (option D) provide mandatory, centralized enforcement without requiring custom server-side hook infrastructure.
Detailed technical explanation
How to think about this question
Azure Repos branch policies are implemented as server-side validation that runs before a pull request is completed. The status check can be a custom Azure Function or a simple script hosted in a build pipeline that inspects each commit message against a regex pattern (e.g., ^(feat|fix|chore)\([a-z]+\): .+). This approach leverages the Git ref-update mechanism via the PR merge process, ensuring that only compliant commits are merged into the protected branch.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-400 question in full detail.
Design and implement source control — This question tests Design and implement source control — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure branch policies on the main branch: require a minimum of one reviewer, and add a status check that runs a script to validate the commit message format — Option D is correct because Azure Repos branch policies allow you to enforce pull request requirements (e.g., minimum number of reviewers) and require a status check that runs a custom script to validate commit message format. This ensures all commits merged into main comply with the naming convention and review policy without complex tooling, fitting the small team's need for a simple, server-side enforcement mechanism.
What should I do if I get this AZ-400 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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