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 team uses Azure Pipelines to build a .NET Core application. The build runs successfully on Windows agents, but you need to also run the build on Linux agents to validate cross-platform compatibility. The pipeline currently has a single `windows-latest` agent pool. What is the most efficient way to run the build on both platforms without duplicating the entire pipeline?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a `strategy` with a `matrix` that specifies `vmImage: ['windows-latest', 'ubuntu-latest']` in the job.
Option B is correct because a strategy with a matrix allows running the same job on multiple agent pools in parallel. Option A is wrong because it duplicates the pipeline. Option C is wrong because it would create two separate jobs that are not easily managed. Option D is wrong because multi-stage runs stages sequentially, not in parallel for this purpose.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Create two separate pipelines, one for each platform.
Why it's wrong here
Duplicating pipelines is inefficient and harder to maintain.
✗
Use a multi-job pipeline with two jobs, each specifying a different pool.
Why it's wrong here
This works but is less efficient than a matrix if the job steps are identical.
✗
Use a multi-stage pipeline with a stage for each platform.
Why it's wrong here
Stages run sequentially, not in parallel, increasing build time.
✓
Add a `strategy` with a `matrix` that specifies `vmImage: ['windows-latest', 'ubuntu-latest']` in the job.
Why this is correct
A matrix strategy runs the same job on multiple agent pools in parallel, meeting the requirement efficiently.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-400 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-400 NAT questions on configuration and troubleshooting.
Design and implement build and release pipelines — This question tests Design and implement build and release pipelines — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Add a `strategy` with a `matrix` that specifies `vmImage: ['windows-latest', 'ubuntu-latest']` in the job. — Option B is correct because a strategy with a matrix allows running the same job on multiple agent pools in parallel. Option A is wrong because it duplicates the pipeline. Option C is wrong because it would create two separate jobs that are not easily managed. Option D is wrong because multi-stage runs stages sequentially, not in parallel for this purpose.
What should I do if I get this AZ-400 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-400 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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