AZ-104 Deploy and Manage Azure Compute Practice Question
This AZ-104 practice question tests your understanding of deploy and manage azure compute. 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.
A container group in Azure Container Instances must pull a private image from Azure Container Registry without embedding registry credentials in the template. What should you configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A managed identity for the container group and the AcrPull role on the registry
Option A is correct because Azure Container Instances (ACI) can authenticate to Azure Container Registry (ACR) using a managed identity assigned to the container group. By granting the managed identity the AcrPull role on the registry, ACI can pull private images without embedding any credentials in the deployment template, leveraging Azure AD authentication and RBAC for secure 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.
✓
A managed identity for the container group and the AcrPull role on the registry
Why this is correct
A managed identity lets the container group authenticate to ACR without secrets, and AcrPull grants pull permission.
Related concept
Read the scenario before looking for a memorised answer.
✗
An admin user account on the Azure Container Registry
Why it's wrong here
Registry admin credentials are secrets and do not meet the requirement to avoid embedding credentials.
✗
A shared access signature in a container environment variable
Why it's wrong here
A SAS token is still a credential and is not the recommended way for ACI to authenticate to ACR.
✗
A public network access rule that allows all Azure services
Why it's wrong here
Network access alone does not provide authentication to a private container registry.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse network access controls (like 'Allow Azure Services' or service endpoints) with authentication mechanisms, assuming that enabling network rules alone grants pull access, when in fact a managed identity with AcrPull is required for credential-free authentication.
Detailed technical explanation
How to think about this question
Under the hood, when a managed identity is assigned to an ACI container group, Azure automatically provisions a service principal in Azure AD and injects an access token into the container environment (via the MSI endpoint at 169.254.169.254). The ACI agent uses this token to authenticate to ACR, obtaining an OAuth2 token with the AcrPull scope, which is then used in the Docker registry auth header (Bearer token) to pull the image. This approach also supports system-assigned and user-assigned managed identities, with the latter allowing pre-provisioned RBAC roles across multiple container groups.
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-104 question in full detail.
Deploy and Manage Azure Compute — This question tests Deploy and Manage Azure Compute — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A managed identity for the container group and the AcrPull role on the registry — Option A is correct because Azure Container Instances (ACI) can authenticate to Azure Container Registry (ACR) using a managed identity assigned to the container group. By granting the managed identity the AcrPull role on the registry, ACI can pull private images without embedding any credentials in the deployment template, leveraging Azure AD authentication and RBAC for secure access.
What should I do if I get this AZ-104 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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