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.
Which TWO actions should you take to ensure that your Git repository in Azure Repos remains performant as it grows?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use shallow clones in CI/CD pipelines.
Shallow clones fetch only the most recent commit history rather than the entire repository history, which significantly reduces the amount of data transferred and stored during CI/CD pipeline runs. This keeps pipeline execution fast and avoids performance degradation as the repository grows. Azure Repos and Azure Pipelines support shallow clone options via the `--depth` parameter in Git commands or through pipeline YAML settings.
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.
✓
Use shallow clones in CI/CD pipelines.
Why this is correct
Shallow clones fetch only recent history, reducing clone time.
Related concept
Read the scenario before looking for a memorised answer.
✗
Store large binary files directly in the repository.
Why it's wrong here
Large binaries bloat the repo.
✓
Use Git LFS for large binary files.
Why this is correct
Git LFS replaces large files with pointers, keeping repo lean.
Related concept
Read the scenario before looking for a memorised answer.
✗
Keep all branches indefinitely to preserve history.
Why it's wrong here
Unused branches increase clone overhead.
✗
Encourage developers to commit all changes in a single commit per day.
Why it's wrong here
Large commits make history hard to navigate.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think storing binaries directly in the repo is acceptable for performance, or that reducing commit frequency improves performance, when in fact these actions degrade performance or violate source control best practices.
Detailed technical explanation
How to think about this question
Shallow clones use the `--depth` option to truncate history at a specified number of commits, which reduces the packfile size and network transfer. However, shallow clones can cause issues with operations that require full history, such as `git bisect` or certain merge strategies; Azure Pipelines mitigates this by allowing `fetchDepth: 1` in YAML. Git LFS replaces large files with text pointers in the repository and stores the actual binary content in a separate remote store, which keeps the Git object database lean and clone operations fast.
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: Use shallow clones in CI/CD pipelines. — Shallow clones fetch only the most recent commit history rather than the entire repository history, which significantly reduces the amount of data transferred and stored during CI/CD pipeline runs. This keeps pipeline execution fast and avoids performance degradation as the repository grows. Azure Repos and Azure Pipelines support shallow clone options via the `--depth` parameter in Git commands or through pipeline YAML settings.
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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