This AZ-204 practice question tests your understanding of implement azure security. 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 have an Azure Function app that needs to retrieve a secret from Azure Key Vault at runtime. You want to avoid storing any credentials in code or configuration. Which mechanism should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Managed identity
Managed identity (B) is the correct mechanism because it allows the Azure Function app to authenticate to Azure Key Vault without storing any credentials in code or configuration. Azure automatically manages the identity and provides a token from Azure AD that the function can use to access the vault, eliminating the need for secrets or keys in the application.
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.
✗
Service principal with client secret
Why it's wrong here
Incorrect. This requires storing the client secret in the application configuration, defeating the purpose.
✓
Managed identity
Why this is correct
Correct. Managed identity allows the Function app to authenticate to Azure Key Vault without any stored credentials.
Related concept
Read the scenario before looking for a memorised answer.
✗
Access key
Why it's wrong here
Incorrect. Access keys are used for Azure Storage, not for Key Vault authentication, and would need to be stored.
✗
Shared access signature (SAS)
Why it's wrong here
Incorrect. SAS tokens are used for delegated access to storage resources, not for authenticating to Key Vault.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse managed identity with a service principal, thinking a client secret is required, or incorrectly assume that an access key or SAS can be used for Key Vault authentication.
Detailed technical explanation
How to think about this question
Under the hood, managed identity uses the Azure Instance Metadata Service (IMDS) endpoint at 169.254.169.254 to obtain an access token for Azure AD. The function runtime automatically handles token acquisition and renewal, and the identity must be granted the appropriate Key Vault access policy (e.g., 'Get' permission for secrets) via RBAC or vault access policies. In a real-world scenario, this is critical for serverless applications where secrets must be rotated without redeployment.
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-204 question in full detail.
Implement Azure security — This question tests Implement Azure security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Managed identity — Managed identity (B) is the correct mechanism because it allows the Azure Function app to authenticate to Azure Key Vault without storing any credentials in code or configuration. Azure automatically manages the identity and provides a token from Azure AD that the function can use to access the vault, eliminating the need for secrets or keys in the application.
What should I do if I get this AZ-204 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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