Question 56 of 760
Secure, monitor, and optimize data storage and data processing →mediumMultiple ChoiceObjective-mapped
DP-203 Practice Question: Secure, monitor, and optimize data storage and data processing
You are designing a data lake architecture using Azure Data Lake Storage Gen2. You need to implement a least-privilege security model. Which authorization mechanism should you use for granular control?
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
✓
Use POSIX-like access control lists (ACLs).
POSIX-like ACLs provide granular permissions at the file and directory level, enabling least-privilege access control. Option A is incorrect because storage account keys grant full access to the entire storage account, violating least privilege. Option B is incorrect because Azure RBAC roles at the storage account level offer coarse-grained control, not granular file/directory permissions. Option D is incorrect because shared access signatures with stored access policies provide time-limited access but lack the detailed ACL capabilities for individual files and directories.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use storage account keys for access.
Why it's wrong here
Account keys provide full access, violating least privilege.
- ✗
Use Azure RBAC roles at the storage account level.
Why it's wrong here
RBAC at account level is not granular enough for file-level permissions.
- ✓
Use POSIX-like access control lists (ACLs).
Why this is correct
ACLs provide granular permissions on files and directories.
- ✗
Use shared access signatures (SAS) with stored access policies.
Why it's wrong here
SAS tokens are time-limited but not as granular as ACLs.
Visual reference
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
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Last reviewed: Jun 21, 2026
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