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.
A company uses Azure Pipelines to build a .NET Core application. The build takes 45 minutes due to dependency restoration. They want to reduce build time. What is the most effective strategy?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cache the NuGet packages and enable caching in the pipeline
Caching NuGet packages in Azure Pipelines is the most effective strategy because dependency restoration is the primary bottleneck, often downloading hundreds of packages from nuget.org. By caching the ~/.nuget/packages folder, subsequent builds skip the network download entirely, reducing the 45-minute build time to minutes. This directly addresses the root cause—repetitive package restoration—without requiring additional infrastructure or parallelism.
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.
✓
Cache the NuGet packages and enable caching in the pipeline
Why this is correct
Caching packages reduces the need to download them every build, significantly reducing build time.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use parallel jobs in the pipeline
Why it's wrong here
Parallel jobs run multiple builds concurrently, not reduce the time of a single build.
✗
Use a self-hosted agent with more CPU
Why it's wrong here
CPU might help but the bottleneck is network download of packages, not CPU.
✗
Enable incremental builds
Why it's wrong here
Incremental builds are already used; the main time is spent restoring packages.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'parallel jobs' or 'faster agents' with solving a network-bound dependency restoration problem, when caching is the only strategy that eliminates the repeated download of unchanged packages.
Detailed technical explanation
How to think about this question
Under the hood, Azure Pipelines caching uses a blob storage (Azure Storage or the pipeline cache service) keyed by a hash of the project file or lock file (e.g., packages.lock.json). When the cache is hit, the pipeline restores packages from the local cache folder instead of making HTTP requests to nuget.org, which can reduce restore time from minutes to seconds. A subtle behavior: if the cache key does not include the OS or agent architecture, cached packages from a Windows agent might be invalid for a Linux agent, causing cache misses and silent fallback to network restore.
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 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: Cache the NuGet packages and enable caching in the pipeline — Caching NuGet packages in Azure Pipelines is the most effective strategy because dependency restoration is the primary bottleneck, often downloading hundreds of packages from nuget.org. By caching the ~/.nuget/packages folder, subsequent builds skip the network download entirely, reducing the 45-minute build time to minutes. This directly addresses the root cause—repetitive package restoration—without requiring additional infrastructure or parallelism.
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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