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.
A developer needs to grant an Azure Function read access to secrets in Azure Key Vault without storing any credentials in the function code or configuration. Which approach should they use?
Why wrong: Using a service principal with a certificate requires storing and rotating the certificate, which adds management overhead.
B
Managed identity
Managed identity eliminates the need for credentials entirely by providing an identity that is automatically managed and can be assigned to the Function app to access Key Vault.
C
Access policy with a client secret
Why wrong: An access policy with a client secret still requires the client secret to be stored somewhere, violating the requirement of no stored credentials.
D
Shared access signature (SAS)
Why wrong: SAS tokens are used for delegated access to Azure Storage, not for accessing Key Vault secrets.
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 approach because it allows the Azure Function to authenticate to Azure Key Vault without storing any credentials in code or configuration. Azure automatically manages the identity, and the function can obtain an access token from Azure AD to read secrets, eliminating the need for secrets, certificates, 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 a certificate
Why it's wrong here
Using a service principal with a certificate requires storing and rotating the certificate, which adds management overhead.
✓
Managed identity
Why this is correct
Managed identity eliminates the need for credentials entirely by providing an identity that is automatically managed and can be assigned to the Function app to access Key Vault.
Related concept
Read the scenario before looking for a memorised answer.
✗
Access policy with a client secret
Why it's wrong here
An access policy with a client secret still requires the client secret to be stored somewhere, violating the requirement of no stored credentials.
✗
Shared access signature (SAS)
Why it's wrong here
SAS tokens are used for delegated access to Azure Storage, not for accessing Key Vault secrets.
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 certificate or client secret is always required, but managed identity eliminates the need for any stored credentials by leveraging Azure's automatic identity management.
Detailed technical explanation
How to think about this question
Under the hood, managed identity uses a service principal of type 'ManagedIdentity' created in Azure AD for the Azure resource. The Azure Instance Metadata Service (IMDS) endpoint at 169.254.169.169 provides an access token when the function runtime requests it, using the managed identity's client ID. This token is then used in the Authorization header when calling Key Vault's REST API (e.g., GET /secrets/{name}?api-version=7.0), with the Key Vault access policy granting the managed identity the necessary 'Get' permission.
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 approach because it allows the Azure Function to authenticate to Azure Key Vault without storing any credentials in code or configuration. Azure automatically manages the identity, and the function can obtain an access token from Azure AD to read secrets, eliminating the need for secrets, certificates, 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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