- A
Generate a SAS token for the source container with read permission and for the destination container with write permission, and store them in Key Vault for the function to retrieve.
Why wrong: This is more complex and not the least privilege approach; RBAC with managed identity is simpler and more secure.
- B
Add the function app's managed identity to the storage account's Access Control (IAM) with the 'Storage Blob Data Owner' role on the entire storage account.
Why wrong: Data Owner is too permissive; least privilege requires specific roles on containers.
- C
Add the function app's managed identity to the source container's Access Control (IAM) with the 'Storage Blob Data Reader' role, and to the destination container with the 'Storage Blob Data Contributor' role.
This grants exactly the needed permissions on each container.
- D
Use the storage account connection string in the function app settings and access the blobs using the connection string.
Why wrong: Connection string uses the storage account key, granting full access and not leveraging managed identity.
AZ-204 Develop for Azure storage Practice Question
This AZ-204 practice question tests your understanding of develop for azure 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.
You are building a serverless application that processes images uploaded to an Azure Blob Storage container. When a new blob is added, an Azure Function (PowerShell) is triggered to generate a thumbnail and store it in a different container. The function must run with the least privilege necessary. The function uses a managed identity assigned to the function app. You need to grant the function access to read blobs from the source container and write blobs to the destination container. The storage account already has a private endpoint configured. What is the correct way to assign permissions?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"least"Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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
Add the function app's managed identity to the source container's Access Control (IAM) with the 'Storage Blob Data Reader' role, and to the destination container with the 'Storage Blob Data Contributor' role.
Option C is correct because it uses Azure RBAC roles scoped to individual containers, granting the function app's managed identity exactly the permissions needed: 'Storage Blob Data Reader' for reading from the source container and 'Storage Blob Data Contributor' for writing to the destination container. This follows the principle of least privilege, avoids over-permissioning, and works seamlessly with private endpoints since RBAC does not depend on network paths.
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.
- ✗
Generate a SAS token for the source container with read permission and for the destination container with write permission, and store them in Key Vault for the function to retrieve.
Why it's wrong here
This is more complex and not the least privilege approach; RBAC with managed identity is simpler and more secure.
- ✗
Add the function app's managed identity to the storage account's Access Control (IAM) with the 'Storage Blob Data Owner' role on the entire storage account.
Why it's wrong here
Data Owner is too permissive; least privilege requires specific roles on containers.
- ✓
Add the function app's managed identity to the source container's Access Control (IAM) with the 'Storage Blob Data Reader' role, and to the destination container with the 'Storage Blob Data Contributor' role.
Why this is correct
This grants exactly the needed permissions on each container.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use the storage account connection string in the function app settings and access the blobs using the connection string.
Why it's wrong here
Connection string uses the storage account key, granting full access and not leveraging managed identity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose the overly broad 'Storage Blob Data Owner' role (Option B) because they think it's simpler, but the question explicitly requires 'least privilege necessary,' making container-scoped roles the correct answer.
Detailed technical explanation
How to think about this question
Azure RBAC for Blob Storage uses the 'Storage Blob Data Reader' role (which allows read and list operations) and 'Storage Blob Data Contributor' role (which allows read, write, and delete). When a private endpoint is used, traffic stays within the virtual network, and RBAC authorization works independently of network access controls, ensuring that only the managed identity's token (obtained via Azure AD) is validated. This approach eliminates the need for any shared secrets or keys.
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.
- →
Develop for Azure storage — study guide chapter
Learn the concepts, then practise the questions
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Develop for Azure storage practice questions
Targeted practice on this topic area only
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FAQ
Questions learners often ask
What does this AZ-204 question test?
Develop for Azure storage — This question tests Develop for Azure storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add the function app's managed identity to the source container's Access Control (IAM) with the 'Storage Blob Data Reader' role, and to the destination container with the 'Storage Blob Data Contributor' role. — Option C is correct because it uses Azure RBAC roles scoped to individual containers, granting the function app's managed identity exactly the permissions needed: 'Storage Blob Data Reader' for reading from the source container and 'Storage Blob Data Contributor' for writing to the destination container. This follows the principle of least privilege, avoids over-permissioning, and works seamlessly with private endpoints since RBAC does not depend on network paths.
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.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 24, 2026
This AZ-204 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-204 exam.
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