The correct approach is to configure access control lists (ACLs) on the directory and assign the application’s managed identity. This works because Azure Data Lake Storage Gen2 uses POSIX-like ACLs that allow you to grant granular directory permissions at the file and folder level, scoping list, read, and write access precisely to the target directory without affecting other parts of the storage account. On the AZ-204 exam, this scenario tests your understanding of how to delegate least-privilege access using managed identities and ACLs rather than account keys or broad RBAC roles, which are common traps. Remember that RBAC roles like Storage Blob Data Contributor grant access to the entire storage account, while ACLs provide the fine-grained control needed here. A helpful memory tip: think of ACLs as the “scalpel” for directory-level permissions, whereas RBAC is the “sledgehammer” for account-wide access.
AZ-204 Develop for Azure storage Practice Question
This AZ-204 practice question tests your understanding of develop for azure storage. 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.
You have an Azure Storage account with hierarchical namespace enabled (Azure Data Lake Storage Gen2). You need to provide an application with delegated access to a specific directory and its contents, with the ability to list, read, and write files. The access must be scoped to the directory and not allow access to other parts of the storage account. Which approach 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
✓
Configure access control lists (ACLs) on the directory and assign the application's managed identity.
Option C is correct because Azure Data Lake Storage Gen2 supports POSIX-like access control lists (ACLs) that can grant granular permissions to a specific directory and its contents. By configuring ACLs on the target directory and assigning the application's managed identity, you can precisely scope list, read, and write access to that directory without affecting other parts of the storage account. This approach avoids the need for account-level keys or RBAC roles, which would grant broader permissions.
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 shared access signature (SAS) token for the directory.
Why it's wrong here
Directory-level SAS is not supported; SAS tokens are typically at account or container level.
✗
Assign the 'Storage Blob Data Contributor' RBAC role to the application at the storage account level.
Why it's wrong here
RBAC roles at account level provide broad access, not scoped to a specific directory.
✓
Configure access control lists (ACLs) on the directory and assign the application's managed identity.
Why this is correct
ACLs allow granular permissions scoped to the directory, and managed identities can be used for authentication.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use the storage account access key in the application.
Why it's wrong here
Access keys provide full control over the storage account, not scoped access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse RBAC roles (which are coarse-grained and account/container-wide) with ACLs (which are fine-grained and directory/file-specific), leading them to choose Option B or A when the requirement is strict directory-level scoping.
Detailed technical explanation
How to think about this question
Azure Data Lake Storage Gen2 ACLs implement the POSIX model with user, group, and mask entries, allowing separate permissions for the owning user, owning group, and others. When a managed identity is used, it must be added as an ACL entry (e.g., as a named user) on the target directory with the desired permissions (e.g., --x for traverse, r-x for read/execute, rwx for full control). Under the hood, the Azure Blob Storage REST API translates these ACLs into authorization decisions during each request, ensuring that even if the identity has broader RBAC roles, the ACLs can further restrict access.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
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: Configure access control lists (ACLs) on the directory and assign the application's managed identity. — Option C is correct because Azure Data Lake Storage Gen2 supports POSIX-like access control lists (ACLs) that can grant granular permissions to a specific directory and its contents. By configuring ACLs on the target directory and assigning the application's managed identity, you can precisely scope list, read, and write access to that directory without affecting other parts of the storage account. This approach avoids the need for account-level keys or RBAC roles, which would grant broader permissions.
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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