- A
Use a script step to determine which services changed, then output variables to dynamically create a job matrix or use the 'each' keyword to iterate over changed services.
This allows the pipeline to dynamically build only the affected services.
- B
Create a multi-stage pipeline where each stage represents a service, and use a 'dependsOn' condition to run stages only if the corresponding service changed.
Why wrong: Stages are not designed for dynamic branching; you would need to hardcode all services.
- C
Create a single job that runs all unit tests for all services on every commit. Use caching to speed up the build.
Why wrong: This does not optimize build times; it builds everything every time.
- D
Create a job for each service that runs in parallel on every commit. Use conditions to skip jobs if the service has not changed, but the conditions would need to check every service, which is complex.
Why wrong: This still creates jobs for all services, and skipping them still incurs overhead.
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. 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.
Your organization uses a monorepo in Azure Repos containing multiple microservices. You need to design a build pipeline that only builds and tests the services that have changed in a given commit, to optimize build times. The pipeline must trigger on any push to any branch, but only the affected services should be built. You also need to ensure that dependent services are rebuilt if their dependencies change. The services are located in subdirectories: /services/serviceA, /services/serviceB, etc. Each service has a Dockerfile and a unit test project. You plan to use a script to determine which services changed. Which approach should you use to implement this pipeline?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use a script step to determine which services changed, then output variables to dynamically create a job matrix or use the 'each' keyword to iterate over changed services.
Option D is correct because the pipeline can use a script to detect changed files in the commit, map them to services, and then dynamically create jobs or stages for each affected service. This is efficient and flexible. Option A is wrong because using a single job that runs all tests ignores the requirement to only build changed services. Option B is wrong because using multiple jobs for all services would build everything every time, not optimizing. Option C is wrong because using a multi-stage pipeline with stages for each service would also build all services every time.
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 a script step to determine which services changed, then output variables to dynamically create a job matrix or use the 'each' keyword to iterate over changed services.
Why this is correct
This allows the pipeline to dynamically build only the affected services.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a multi-stage pipeline where each stage represents a service, and use a 'dependsOn' condition to run stages only if the corresponding service changed.
Why it's wrong here
Stages are not designed for dynamic branching; you would need to hardcode all services.
- ✗
Create a single job that runs all unit tests for all services on every commit. Use caching to speed up the build.
Why it's wrong here
This does not optimize build times; it builds everything every time.
- ✗
Create a job for each service that runs in parallel on every commit. Use conditions to skip jobs if the service has not changed, but the conditions would need to check every service, which is complex.
Why it's wrong here
This still creates jobs for all services, and skipping them still incurs overhead.
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.
What to study next
Got this wrong? Here's your next step.
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.
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FAQ
Questions learners often ask
What does this AZ-400 question test?
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 a script step to determine which services changed, then output variables to dynamically create a job matrix or use the 'each' keyword to iterate over changed services. — Option D is correct because the pipeline can use a script to detect changed files in the commit, map them to services, and then dynamically create jobs or stages for each affected service. This is efficient and flexible. Option A is wrong because using a single job that runs all tests ignores the requirement to only build changed services. Option B is wrong because using multiple jobs for all services would build everything every time, not optimizing. Option C is wrong because using a multi-stage pipeline with stages for each service would also build all services every time.
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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Last reviewed: Jun 20, 2026
This AZ-400 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-400 exam.
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