Question 104 of 997

Develop Azure compute solutions →mediumMultiple SelectObjective-mapped

Quick Answer

The correct answer is to enable a system-assigned managed identity on the function app and grant it the 'Storage Blob Data Contributor' role, or to create a user-assigned managed identity, assign it to the function app, and grant it the 'Storage Queue Data Contributor' role. Both options work because managed identities provide an automatically managed Azure AD identity, allowing your function app to authenticate to Azure Storage without storing any connection strings or secrets in code or configuration. Azure RBAC then authorizes that identity for specific data plane operations—blob or queue access—by assigning the appropriate built-in role. On the AZ-204 exam, this scenario tests your understanding of how to securely connect serverless compute to storage services using identity-based authentication, a key pattern for modern cloud-native applications. A common trap is confusing the role needed for blobs versus queues; remember that 'Blob Data Contributor' handles blobs, while 'Queue Data Contributor' handles queues. Memory tip: think "Blob for blobs, Queue for queues, and Managed Identity for zero keys."

AZ-204 Develop Azure compute solutions Practice Question

This AZ-204 practice question tests your understanding of develop azure compute solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 TWO options are valid ways to authenticate an Azure Functions app to Azure Storage when using a managed identity? (Choose two.)

Question 1mediummulti select

Full question →

A
Enable system-assigned managed identity on the function app and grant it the 'Storage Blob Data Contributor' role
System-assigned managed identity is tied to the function app and can be granted RBAC roles.
B
Generate a shared access signature (SAS) token and include it in the connection string
Why wrong: SAS tokens are shared secrets, not managed identities.
C
Use the storage account access key in the connection string
Why wrong: Access keys are not managed identities; they are shared secrets.
D
Create a user-assigned managed identity, assign it to the function app, and grant it the 'Storage Queue Data Contributor' role
User-assigned managed identity is a standalone resource that can be assigned to multiple services.
E
Use the default AzureWebJobsStorage connection string from the function app settings
Why wrong: Connection strings use keys, not managed identities.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Enable system-assigned managed identity on the function app and grant it the 'Storage Blob Data Contributor' role

Option A is correct because enabling a system-assigned managed identity on the function app allows it to authenticate to Azure Storage without storing credentials. Granting the 'Storage Blob Data Contributor' role to that identity via Azure RBAC authorizes the function app to perform blob data operations (read, write, delete) using Azure AD tokens, which are automatically managed by the Azure platform.

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.

✓
Enable system-assigned managed identity on the function app and grant it the 'Storage Blob Data Contributor' role
Why this is correct
System-assigned managed identity is tied to the function app and can be granted RBAC roles.
Related concept
Read the scenario before looking for a memorised answer.
✗
Generate a shared access signature (SAS) token and include it in the connection string
Why it's wrong here
SAS tokens are shared secrets, not managed identities.
✗
Use the storage account access key in the connection string
Why it's wrong here
Access keys are not managed identities; they are shared secrets.
✓
Create a user-assigned managed identity, assign it to the function app, and grant it the 'Storage Queue Data Contributor' role
Why this is correct
User-assigned managed identity is a standalone resource that can be assigned to multiple services.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use the default AzureWebJobsStorage connection string from the function app settings
Why it's wrong here
Connection strings use keys, not managed identities.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may confuse 'managed identity' with any non-key-based method (like SAS tokens) or assume the default AzureWebJobsStorage connection string automatically uses managed identity, when in fact it defaults to a key-based connection unless explicitly configured for identity-based authentication.

Detailed technical explanation

How to think about this question

Under the hood, when a managed identity is enabled, the Azure Instance Metadata Service (IMDS) provides an access token for the identity, which the function runtime uses to authenticate to Azure Storage via the Azure.Identity library (e.g., DefaultAzureCredential). The RBAC role assignment (e.g., 'Storage Blob Data Contributor') must be scoped to the storage account, resource group, or subscription, and it can take a few minutes to propagate. A real-world scenario is a function that processes blobs triggered by an event; using managed identity avoids key rotation issues and improves security by eliminating hardcoded credentials.

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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this AZ-204 question test?

Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Enable system-assigned managed identity on the function app and grant it the 'Storage Blob Data Contributor' role — Option A is correct because enabling a system-assigned managed identity on the function app allows it to authenticate to Azure Storage without storing credentials. Granting the 'Storage Blob Data Contributor' role to that identity via Azure RBAC authorizes the function app to perform blob data operations (read, write, delete) using Azure AD tokens, which are automatically managed by the Azure platform.

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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