Question 760 of 1,170

Implement and Manage Storage →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is to assign the user the Storage Blob Data Reader role on the container or storage account. This is correct because Azure AD authorization for blob storage requires explicit RBAC role assignments for data plane operations, and the portal bypasses this by using the user’s own identity with implicit permissions like subscription-level Reader. However, a custom app authenticates with its own service principal or user identity, which lacks the necessary role to read blob data, causing the 403 error. On the AZ-104 exam, this scenario tests your understanding of the difference between management plane permissions (like Contributor) and data plane permissions (like Storage Blob Data Reader), a common trap where students assume portal access guarantees app access. Remember: portal uses your identity, app uses its own—always assign the data role to the app’s identity. A helpful mnemonic is “Portal’s your pass, app needs its own class.”

AZ-104 Implement and Manage Storage Practice Question

This AZ-104 practice question tests your understanding of implement and manage storage. 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 can access an Azure Blob container from the portal using Microsoft Entra sign-in, but their custom app gets a 403 error when reading the same blob. The storage account is configured to use Azure AD authorization. What is the most likely fix?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Question 1mediummultiple choice

Full question →

A
Assign the user the Storage Blob Data Reader role on the container or storage account.
A 403 in this scenario usually means the identity lacks data-plane permissions. The user needs an Azure RBAC role such as Storage Blob Data Reader at the appropriate scope so the app can read blob content through Azure AD authorization.
B
Assign the user the Reader role on the subscription.
Why wrong: Reader allows management-plane visibility, but it does not grant permission to read blob data. Blob access requires a storage data role.
C
Enable shared key access so the app can bypass Azure AD permissions.
Why wrong: Enabling shared key access would weaken the security model and is not the correct fix when Azure AD authorization is already intended for the storage account.
D
Move the container to the Hot tier so Azure AD authentication can succeed.
Why wrong: Access tier does not control authentication or authorization. Hot, Cool, and Archive affect storage economics and availability, not whether the identity is allowed to read the blob.

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

✓

Assign the user the Storage Blob Data Reader role on the container or storage account.

The developer can authenticate via the portal because the portal uses the user's own Microsoft Entra identity, which may have implicit permissions (e.g., via group membership or subscription-level Reader). However, the custom app must explicitly be granted the Storage Blob Data Reader role on the container or storage account to authorize data plane operations (reading blobs). Without this role assignment, the app's identity lacks the RBAC permission to perform blob read operations, resulting in a 403 error.

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.

✓
Assign the user the Storage Blob Data Reader role on the container or storage account.
Why this is correct
A 403 in this scenario usually means the identity lacks data-plane permissions. The user needs an Azure RBAC role such as Storage Blob Data Reader at the appropriate scope so the app can read blob content through Azure AD authorization.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Assign the user the Reader role on the subscription.
Why it's wrong here
Reader allows management-plane visibility, but it does not grant permission to read blob data. Blob access requires a storage data role.
✗
Enable shared key access so the app can bypass Azure AD permissions.
Why it's wrong here
Enabling shared key access would weaken the security model and is not the correct fix when Azure AD authorization is already intended for the storage account.
✗
Move the container to the Hot tier so Azure AD authentication can succeed.
Why it's wrong here
Access tier does not control authentication or authorization. Hot, Cool, and Archive affect storage economics and availability, not whether the identity is allowed to read the blob.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates confuse the management plane Reader role (which allows viewing the storage account in the portal) with the data plane Storage Blob Data Reader role (which is required to actually read blob content), leading them to incorrectly select Option B.

Detailed technical explanation

How to think about this question

Azure RBAC for Blob storage uses separate roles for management plane (e.g., Reader, Contributor) and data plane (e.g., Storage Blob Data Reader, Storage Blob Data Contributor). The 403 error occurs because the app's service principal or managed identity lacks a data plane role assignment at the appropriate scope (container, storage account, or resource group). Under the hood, Azure AD tokens for data plane operations must include the 'https://storage.azure.com' audience, and the authorization check evaluates RBAC assignments against the storage resource provider's data plane endpoint.

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-104 question test?

Implement and Manage Storage — This question tests Implement and Manage Storage — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Assign the user the Storage Blob Data Reader role on the container or storage account. — The developer can authenticate via the portal because the portal uses the user's own Microsoft Entra identity, which may have implicit permissions (e.g., via group membership or subscription-level Reader). However, the custom app must explicitly be granted the Storage Blob Data Reader role on the container or storage account to authorize data plane operations (reading blobs). Without this role assignment, the app's identity lacks the RBAC permission to perform blob read operations, resulting in a 403 error.

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.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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