AZ-400 Practice Question: Design and implement build and release pipelines
This AZ-400 practice question tests your understanding of design and implement build and release pipelines. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Your Azure DevOps pipeline uses the 'DotNetCoreCLI@2' task to run unit tests. Some tests are failing intermittently. You suspect test flakiness due to race conditions. What should you do to automatically retry failed tests without rewriting the tests?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the 'VSTest@2' task with 'retryFailedTests: true' option.
Option B is correct because the 'retryFailedTests' option in the VSTest task automatically retries failed tests. Option A is a workaround but not a built-in feature. Option C requires custom scripting. Option D is not available in Azure DevOps.
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 the 'VSTest@2' task with 'retryFailedTests: true' option.
Why this is correct
The VSTest@2 task supports automatic retry of failed tests.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a custom script that runs each test individually and retries on failure.
Why it's wrong here
This is complex and not recommended; built-in support exists.
✗
Enable 'test retry' in the pipeline settings under 'General'.
Why it's wrong here
There is no such setting in pipeline general settings.
✗
Wrap the test task in a 'Retry' loop using a 'each' expression.
Why it's wrong here
This would retry the entire task, not individual tests.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
Identify which AZ-400 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Design and implement build and release pipelines — This question tests Design and implement build and release pipelines — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use the 'VSTest@2' task with 'retryFailedTests: true' option. — Option B is correct because the 'retryFailedTests' option in the VSTest task automatically retries failed tests. Option A is a workaround but not a built-in feature. Option C requires custom scripting. Option D is not available in Azure DevOps.
What should I do if I get this AZ-400 question wrong?
Identify which AZ-400 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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