- A
Create a private endpoint for the storage account and assign the data-scientists group to the private endpoint's access policy
Why wrong: Assigning the Storage Blob Data Reader role at the storage account level would grant the data-scientists group read access to all containers, but you cannot create an RBAC deny assignment that blocks all other users while allowing this group. RBAC deny assignments override allowed assignments globally, not per user/group.
- B
Assign the Storage Blob Data Reader role to the data-scientists group at the storage account level and add a deny assignment for all other users
Why wrong: Private endpoints control network access to the storage account, not identity-based permissions. They do not manage which users can read data.
- C
Use a managed identity for the data-scientists group and assign the Storage Blob Data Contributor role to the managed identity
Why wrong: Managed identities are used for authentication from Azure services, not for granting permissions to a specific user group. Assigning Storage Blob Data Contributor to a managed identity does not give the data-scientists group any access.
- D
Configure access control lists (ACLs) on the 'processed' container to grant read and execute permissions to the data-scientists group and set the default ACL to deny all
ACLs in ADLS Gen2 allow you to set fine-grained permissions at the file and directory level. By granting read and execute permissions to the data-scientists group on the 'processed' container and setting the default ACL to deny all others, only that group can read files.
How to Deny Read Access to All Users Except a Specific Group Using ACLs
This DP-203 practice question tests your understanding of secure, monitor, and optimize data storage and data processing. 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. A key principle to apply: access Control Lists (ACLs). 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.
Your company uses Azure Data Lake Storage Gen2 with hierarchical namespace enabled. You need to ensure that only the 'data-scientists' group can read files in the 'processed' container, while denying access to all other users. You have already configured the storage account firewall to allow access only from your corporate network. What should you do next?
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
Configure access control lists (ACLs) on the 'processed' container to grant read and execute permissions to the data-scientists group and set the default ACL to deny all
Option D is correct because in Azure Data Lake Storage Gen2 with hierarchical namespace, access control lists (ACLs) provide fine-grained permissions at the directory and file level. By granting read and execute permissions to the 'data-scientists' group on the 'processed' container and setting the default ACL to deny all, you ensure only that group can read files. Option A is incorrect because private endpoints control network access, not identity-based permissions. Option B is incorrect because RBAC roles (like Storage Blob Data Reader) grant permissions at the storage account or container level, and Azure RBAC does not support deny assignments that would block specific users while allowing others at the same scope; a deny assignment would block everyone. Option C is incorrect because managed identities are used for authenticating Azure services, not for granting permissions to a security group.
Key principle: Access Control Lists (ACLs)
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a private endpoint for the storage account and assign the data-scientists group to the private endpoint's access policy
Why it's wrong here
Assigning the Storage Blob Data Reader role at the storage account level would grant the data-scientists group read access to all containers, but you cannot create an RBAC deny assignment that blocks all other users while allowing this group. RBAC deny assignments override allowed assignments globally, not per user/group.
- ✗
Assign the Storage Blob Data Reader role to the data-scientists group at the storage account level and add a deny assignment for all other users
Why it's wrong here
Private endpoints control network access to the storage account, not identity-based permissions. They do not manage which users can read data.
- ✗
Use a managed identity for the data-scientists group and assign the Storage Blob Data Contributor role to the managed identity
Why it's wrong here
Managed identities are used for authentication from Azure services, not for granting permissions to a specific user group. Assigning Storage Blob Data Contributor to a managed identity does not give the data-scientists group any access.
- ✓
Configure access control lists (ACLs) on the 'processed' container to grant read and execute permissions to the data-scientists group and set the default ACL to deny all
Why this is correct
ACLs in ADLS Gen2 allow you to set fine-grained permissions at the file and directory level. By granting read and execute permissions to the data-scientists group on the 'processed' container and setting the default ACL to deny all others, only that group can read files.
Related concept
Access Control Lists (ACLs)
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Access Control Lists (ACLs)
- Hierarchical Namespace
- Role-Based Access Control (RBAC)
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
Access Control Lists (ACLs)
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.
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 |
What to study next
Got this wrong? Here's your next step.
Review access Control Lists (ACLs), then practise related DP-203 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DP-203 question test?
Secure, monitor, and optimize data storage and data processing — This question tests Secure, monitor, and optimize data storage and data processing — Access Control Lists (ACLs).
What is the correct answer to this question?
The correct answer is: Configure access control lists (ACLs) on the 'processed' container to grant read and execute permissions to the data-scientists group and set the default ACL to deny all — Option D is correct because in Azure Data Lake Storage Gen2 with hierarchical namespace, access control lists (ACLs) provide fine-grained permissions at the directory and file level. By granting read and execute permissions to the 'data-scientists' group on the 'processed' container and setting the default ACL to deny all, you ensure only that group can read files. Option A is incorrect because private endpoints control network access, not identity-based permissions. Option B is incorrect because RBAC roles (like Storage Blob Data Reader) grant permissions at the storage account or container level, and Azure RBAC does not support deny assignments that would block specific users while allowing others at the same scope; a deny assignment would block everyone. Option C is incorrect because managed identities are used for authenticating Azure services, not for granting permissions to a security group.
What should I do if I get this DP-203 question wrong?
Review access Control Lists (ACLs), then practise related DP-203 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Access Control Lists (ACLs)
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Last reviewed: Jun 21, 2026
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