AZ-400 Design and implement source control Practice Question
This AZ-400 practice question tests your understanding of design and implement source control. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
An organization uses Azure Repos with multiple Git repositories. They want to enforce that all commits to the main branch are signed using GPG keys. Which combination of actions is required to enforce commit signing?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure branch policy to require signed commits and have developers configure Git to sign commits with their GPG key.
Option C is correct because Azure Repos supports a branch policy that requires commits to be signed, and developers must configure Git to sign commits with their GPG key using `git config --global user.signingkey` and `git commit -S`. This ensures that only signed commits are accepted into the main branch, enforcing non-repudiation and integrity.
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.
✗
Configure branch policy to require signed commits and have developers add their SSH public key to Azure Repos.
Read the scenario before looking for a memorised answer.
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Use Azure Key Vault to store signing keys and configure Azure Repos to automatically sign commits.
Why it's wrong here
Azure Repos does not automatically sign commits with Key Vault keys.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing authentication methods (SSH keys, PATs) with commit signing (GPG keys), leading candidates to select options that address access control rather than cryptographic integrity.
Detailed technical explanation
How to think about this question
Git commit signing uses GPG (RFC 4880) to create a digital signature that is attached to the commit object. Azure Repos verifies the signature against the developer's uploaded public GPG key. The branch policy 'Require signed commits' rejects any commit that is not signed or has an invalid signature, preventing tampered or impersonated commits from entering 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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 policy to require signed commits and have developers configure Git to sign commits with their GPG key. — Option C is correct because Azure Repos supports a branch policy that requires commits to be signed, and developers must configure Git to sign commits with their GPG key using `git config --global user.signingkey` and `git commit -S`. This ensures that only signed commits are accepted into the main branch, enforcing non-repudiation and integrity.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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