This AZ-400 practice question tests your understanding of design and implement build and release pipelines. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 are configuring a YAML pipeline that deploys to multiple environments. The pipeline should automatically trigger when changes are pushed to the main branch, but only if the build artifact changes. Which trigger configuration should you use?
trigger: branches: include: - main
Why wrong: This triggers on any change to main, regardless of artifact changes.
pr: branches: include: - main
Why wrong: This triggers on pull request to main, not on pushes.
resources: containers: - container: myContainer
Why wrong: This defines a container resource, not a trigger.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
trigger: paths: include: - src/*
Option B is correct because the `trigger: paths: include: - src/*` configuration specifies that the pipeline should only trigger when changes are pushed to the `main` branch AND those changes affect files under the `src/` directory. This ensures that the pipeline runs only when the build artifact (source code) changes, not for other changes like documentation or configuration files. The `paths` filter works in conjunction with the branch filter to provide fine-grained control over pipeline triggers.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
trigger: branches: include: - main
Why it's wrong here
This triggers on any change to main, regardless of artifact changes.
pr: branches: include: - main
Why it's wrong here
This triggers on pull request to main, not on pushes.
resources: containers: - container: myContainer
Why it's wrong here
This defines a container resource, not a trigger.
Option-by-option analysis
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-400 exam frequently reuses these exact scenarios with slightly different constraints.
Why this is wrong here
This triggers on any change to main, regardless of artifact changes.
Why this is wrong here
This triggers on pull request to main, not on pushes.
Why this is wrong here
This defines a container resource, not a trigger.
Analysis generated from the official AZ-400blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
The trap here is that candidates often confuse the `trigger` and `pr` keywords, or assume that a branch trigger alone is sufficient, forgetting that path filtering is required to restrict triggers to specific file changes.
Detailed technical explanation
Azure Pipelines path triggers use glob patterns to match file changes; the `src/*` pattern matches any file directly under the `src/` directory but not in subdirectories (use `src/**` for recursive matching). Path triggers are evaluated against the diff of the push event, and if no matching files are changed, the pipeline is skipped entirely. This is particularly useful in monorepo scenarios where multiple artifacts are built from different directories, preventing unnecessary pipeline runs and conserving build agent resources.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
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..
The correct answer is: trigger: paths: include: - src/* — Option B is correct because the `trigger: paths: include: - src/*` configuration specifies that the pipeline should only trigger when changes are pushed to the `main` branch AND those changes affect files under the `src/` directory. This ensures that the pipeline runs only when the build artifact (source code) changes, not for other changes like documentation or configuration files. The `paths` filter works in conjunction with the branch filter to provide fine-grained control over pipeline triggers.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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