AZ-400 Container with managed identity access. Practice Question
This AZ-400 practice question tests your understanding of design and implement build and release pipelines. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
You are designing a pipeline that must run tasks in a container. The container needs access to Azure resources using a managed identity. Which two configurations are required? (Choose two.)
Why wrong: docker login is for authentication to a container registry, not for Azure resources.
C
Add a service principal connection to the pipeline.
Why wrong: Service principal connection is for non-managed identity authentication; managed identity avoids storing credentials.
E
Use the Azure CLI task with '–identity' flag.
Why wrong: The Azure CLI task can use managed identity, but the configuration requires the identity to be assigned and the task to run inside the container.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable a system-assigned managed identity on the agent VM.
Option A is correct because a system-assigned managed identity on the agent VM allows the container to authenticate to Azure resources without storing credentials. Option D is correct because setting the 'identity' field in the container resource definition explicitly assigns that managed identity to the container, enabling it to request tokens from Azure AD for resource access.
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 the 'docker login' command in the pipeline.
Why it's wrong here
docker login is for authentication to a container registry, not for Azure resources.
✗
Add a service principal connection to the pipeline.
Why it's wrong here
Service principal connection is for non-managed identity authentication; managed identity avoids storing credentials.
✗
Use the Azure CLI task with '–identity' flag.
Why it's wrong here
The Azure CLI task can use managed identity, but the configuration requires the identity to be assigned and the task to run inside the container.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-400 exam frequently reuses these exact scenarios with slightly different constraints.
✓Enable a system-assigned managed identity on the agent VM.Correct answer▾✗Use the 'docker login' command in the pipeline.Wrong answer — click to see why▾
Why this is wrong here
docker login is for authentication to a container registry, not for Azure resources.
✗Add a service principal connection to the pipeline.Wrong answer — click to see why▾
Why this is wrong here
Service principal connection is for non-managed identity authentication; managed identity avoids storing credentials.
✗Use the Azure CLI task with '–identity' flag.Wrong answer — click to see why▾
Why this is wrong here
The Azure CLI task can use managed identity, but the configuration requires the identity to be assigned and the task to run inside the container.
Analysis generated from the official AZ-400blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse pipeline-level authentication (service principal connections) with container-level identity assignment, or think that a Docker login or Azure CLI flag can substitute for the explicit identity configuration on the container resource.
Detailed technical explanation
How to think about this question
Under the hood, a system-assigned managed identity creates a service principal in Azure AD automatically tied to the VM's lifecycle. When the container resource definition includes the 'identity' field (e.g., 'identity: { type: SystemAssigned }' in a Docker Compose or Azure Container Instances YAML), the container's process can acquire an access token from the Azure Instance Metadata Service (IMDS) endpoint (169.254.169.254) without any secrets. In a real-world scenario, this is critical for pipelines that deploy containers needing to read from Azure Key Vault or write to Azure Storage, as it eliminates credential management.
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 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 a system-assigned managed identity on the agent VM. — Option A is correct because a system-assigned managed identity on the agent VM allows the container to authenticate to Azure resources without storing credentials. Option D is correct because setting the 'identity' field in the container resource definition explicitly assigns that managed identity to the container, enabling it to request tokens from Azure AD for resource access.
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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