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.
You have a YAML pipeline that uses a self-hosted agent. The agent runs on a VM in Azure. The pipeline fails intermittently with the error: '##[error]The job running on agent MyAgent has been cancelled because the agent was idle for more than the maximum idle time.' You need to resolve this issue. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the agent's idle timeout setting to a higher value or disable it.
Option B is correct because the agent is being reaped due to idle timeout. Disabling the idle timeout or increasing its value prevents the agent from being cancelled when the job takes time to start (e.g., waiting for dependencies). Option A is wrong because communication timeout is different from idle timeout. Option C is wrong because increasing agent pool size does not prevent individual agent timeout. Option D is wrong because parallel jobs do not affect idle timeout.
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 the agent's idle timeout setting to a higher value or disable it.
Why this is correct
The idle timeout cancels the job if the agent is idle too long; increasing it prevents premature cancellation.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add more agents to the agent pool.
Why it's wrong here
Adding agents does not fix the idle timeout issue on the existing agent.
✗
Increase the job's timeout in minutes.
Why it's wrong here
Job timeout controls how long the job can run, not idle time.
✗
Reduce the number of parallel jobs to avoid overloading the agent.
Why it's wrong here
The error is about idle timeout, not resource overload.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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: Configure the agent's idle timeout setting to a higher value or disable it. — Option B is correct because the agent is being reaped due to idle timeout. Disabling the idle timeout or increasing its value prevents the agent from being cancelled when the job takes time to start (e.g., waiting for dependencies). Option A is wrong because communication timeout is different from idle timeout. Option C is wrong because increasing agent pool size does not prevent individual agent timeout. Option D is wrong because parallel jobs do not affect idle timeout.
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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