AZ-400 Design and implement a DevOps infrastructure Practice Question
This AZ-400 practice question tests your understanding of design and implement a devops infrastructure. 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 of the following are valid ways to trigger a pipeline in Azure DevOps when a pull request is created?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Pull request trigger in YAML pipeline
Option A is correct because Azure DevOps YAML pipelines support a `pr` trigger that automatically runs the pipeline when a pull request is created or updated. This trigger is defined directly in the YAML file and can be scoped to specific branches or paths, making it a native and flexible way to respond to PR events.
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.
✓
Pull request trigger in YAML pipeline
Why this is correct
YAML pipelines can define PR triggers using the 'pr:' keyword.
Related concept
Read the scenario before looking for a memorised answer.
✗
Scheduled trigger
Why it's wrong here
Scheduled triggers run at specified times, not on PR creation.
✗
Continuous integration trigger
Why it's wrong here
CI triggers run on commits, not PRs.
✓
Branch policy with build validation
Why this is correct
Branch policies can require a build to succeed before merging.
Related concept
Read the scenario before looking for a memorised answer.
✗
Pipeline completion trigger
Why it's wrong here
Pipeline completion triggers run when another pipeline completes, not on PR creation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the continuous integration trigger (which fires on push) with the pull request trigger, or they overlook that branch policy build validation is a separate but equally valid method to trigger a pipeline on PR creation.
Detailed technical explanation
How to think about this question
The `pr` trigger in YAML pipelines uses the Azure DevOps REST API to listen for pull request lifecycle events (created, updated, etc.) and automatically enqueues a pipeline run. This trigger supports path filters and branch filters, allowing fine-grained control over which PRs trigger builds. In contrast, branch policy build validation is configured at the repository level and uses the same underlying mechanism but is enforced by the branch policy system, ensuring that PRs cannot be completed without a successful pipeline run.
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 DevOps infrastructure — This question tests Design and implement a DevOps infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Pull request trigger in YAML pipeline — Option A is correct because Azure DevOps YAML pipelines support a `pr` trigger that automatically runs the pipeline when a pull request is created or updated. This trigger is defined directly in the YAML file and can be scoped to specific branches or paths, making it a native and flexible way to respond to PR events.
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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