AZ-400 Practice Question: Design and implement a source control strategy
This AZ-400 practice question tests your understanding of design and implement a source control strategy. 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.
Exhibit
Refer to the exhibit.
```json
{
"branch": "refs/heads/feature-123",
"before": "0000000000000000000000000000000000000000",
"after": "abc123def456abc123def456abc123def456abc1",
"commits": [
{
"id": "abc123def456abc123def456abc123def456abc1",
"message": "Add new feature"
}
]
}
```
You are reviewing a webhook payload from Azure Repos. The payload indicates that a new branch named 'feature-123' was created. Which event type triggered this webhook?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A new branch creation.
The webhook payload explicitly indicates that a new branch named 'feature-123' was created. In Azure Repos, the event type that corresponds to this action is 'New branch creation' (also known as 'Push' with a new ref). This event fires when a new branch reference is pushed to the remote repository, which is exactly what happened here.
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.
✓
A new branch creation.
Why this is correct
All zeros in 'before' indicates a new branch.
Related concept
Read the scenario before looking for a memorised answer.
✗
A push to an existing branch.
Why it's wrong here
Existing branch push has non-zero 'before'.
✗
A branch deletion.
Why it's wrong here
Branch deletion has 'after' all zeros.
✗
A pull request update.
Why it's wrong here
Pull request events have different JSON structure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the 'Push' event type with 'New branch creation', not realizing that Azure Repos uses the same 'Push' event for both, but the payload's 'refUpdates' array contains a 'created' flag that distinguishes them.
Detailed technical explanation
How to think about this question
Under the hood, Azure Repos webhooks use the 'Push' event type for both new branch creation and updates to existing branches, but the payload includes a 'refUpdates' array that distinguishes between 'create' (new ref) and 'update' (existing ref) actions. The 'created' field in the payload is set to 'true' for new branches, which is how the system differentiates this event from a simple push. In a real-world scenario, you might use this webhook to trigger a CI/CD pipeline only for new branches, avoiding redundant builds on every push to an existing 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 a source control strategy — This question tests Design and implement a source control strategy — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A new branch creation. — The webhook payload explicitly indicates that a new branch named 'feature-123' was created. In Azure Repos, the event type that corresponds to this action is 'New branch creation' (also known as 'Push' with a new ref). This event fires when a new branch reference is pushed to the remote repository, which is exactly what happened here.
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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