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 Azure Pipelines with Microsoft-hosted agents. The pipeline runs a .NET Core application build. You notice that the build takes longer than expected. Which THREE actions can you take to improve build performance? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable caching for NuGet packages.
Option B is correct because enabling NuGet package caching in Azure Pipelines stores downloaded packages on the agent, avoiding repeated downloads from the NuGet feed on subsequent builds. This significantly reduces build time, especially when the same packages are used across multiple pipeline runs, as network latency and package restore operations are minimized.
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.
✗
Add more build steps to the pipeline.
Why it's wrong here
More steps increase build time.
✓
Enable caching for NuGet packages.
Why this is correct
Caching reduces download time for packages.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the number of parallel jobs in the pipeline.
Why it's wrong here
Increasing parallel jobs may not help a single build; it helps multiple builds.
✓
Use multi-stage build with parallel test execution.
Why this is correct
Parallel test execution reduces overall build time.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use a self-hosted agent with pre-installed dependencies.
Why this is correct
Self-hosted agents can have dependencies pre-installed, reducing setup time.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse increasing parallel jobs (which affects concurrency) with optimizing a single pipeline's execution time, leading them to incorrectly select option C.
Detailed technical explanation
How to think about this question
NuGet caching leverages the `NuGetCache` task or the `CacheBeta` task in Azure Pipelines, which stores packages in a local folder (e.g., `$(Pipeline.Workspace)/.nuget/packages`) and uses a hash of the `packages.lock.json` or project files as the cache key. This avoids redundant HTTP requests to NuGet.org or private feeds, which can be a bottleneck in builds with many dependencies. In real-world scenarios, teams with large monorepos or frequent builds see up to 50% reduction in restore time by enabling caching.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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 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: Enable caching for NuGet packages. — Option B is correct because enabling NuGet package caching in Azure Pipelines stores downloaded packages on the agent, avoiding repeated downloads from the NuGet feed on subsequent builds. This significantly reduces build time, especially when the same packages are used across multiple pipeline runs, as network latency and package restore operations are minimized.
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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