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. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Which THREE of the following are prerequisites for implementing a CI/CD pipeline for a .NET Core application?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Build agent (Microsoft-hosted or self-hosted)
A build agent is required to execute the pipeline tasks, such as compiling code, running tests, and packaging artifacts. Microsoft-hosted agents provide a pre-configured environment with common tools, while self-hosted agents allow custom configurations and access to on-premises resources. Without a build agent, the CI/CD pipeline cannot perform any automated build or deployment steps.
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.
✓
Build agent (Microsoft-hosted or self-hosted)
Why this is correct
A build agent executes the pipeline tasks.
Related concept
Read the scenario before looking for a memorised answer.
✓
Source control repository (e.g., Git)
Why this is correct
Code must be stored in a version control system.
Related concept
Read the scenario before looking for a memorised answer.
✗
Unit test framework
Why it's wrong here
Unit tests are a good practice but not a prerequisite.
✗
Docker container registry
Why it's wrong here
Docker is not required for .NET Core; it can be deployed directly.
✓
Target deployment environment (e.g., App Service)
Why this is correct
The pipeline deploys to a target environment.
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 mistake optional pipeline components (like unit tests or container registries) as prerequisites, when in fact only the core infrastructure (agent, source control, and target environment) is mandatory for a basic CI/CD pipeline.
Detailed technical explanation
How to think about this question
The build agent communicates with Azure Pipelines via the Agent Pool REST API, using OAuth tokens for authentication. Microsoft-hosted agents run on Azure virtual machines with a clean image per job, ensuring isolation, while self-hosted agents require manual maintenance and registration using a Personal Access Token (PAT). In a real-world scenario, choosing self-hosted agents is critical when the build requires specific SDK versions, network access to internal NuGet feeds, or compliance with data residency policies.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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: Build agent (Microsoft-hosted or self-hosted) — A build agent is required to execute the pipeline tasks, such as compiling code, running tests, and packaging artifacts. Microsoft-hosted agents provide a pre-configured environment with common tools, while self-hosted agents allow custom configurations and access to on-premises resources. Without a build agent, the CI/CD pipeline cannot perform any automated build or deployment steps.
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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