The answer is to set POSIX-like access control lists (ACLs) on the container folder for the Data Reader role. This is correct because Azure Data Lake Storage Gen2 with hierarchical namespace enabled supports POSIX-style ACLs that provide fine-grained permissions at the directory and file level, allowing you to grant Read and Execute permissions exclusively to the Data Reader security group while blocking all others. On the DP-203 exam, this scenario tests your understanding of how ACLs complement Azure RBAC—RBAC controls control-plane operations like listing storage accounts, while ACLs govern data-plane access within a container. A common trap is assuming that assigning the built-in Storage Blob Data Reader role at the storage account level is sufficient, but that would grant access to all containers, violating the requirement for container-specific restriction. Memory tip: think of ACLs as the "door locks" inside the house, while RBAC is the key to the front gate—you need both for least-privilege security.
DP-203 Design and implement data security Practice Question
This DP-203 practice question tests your understanding of design and implement data security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 company has an Azure Data Lake Storage Gen2 account. They want to ensure that only users with the 'Data Reader' role can access files in a specific container, while other users cannot list or read files. The storage account has hierarchical namespace enabled. What is the most secure and manageable approach?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set POSIX-like access control lists (ACLs) on the container folder for the Data Reader role
Option D is correct because Azure Data Lake Storage Gen2 with hierarchical namespace enabled supports POSIX-like access control lists (ACLs) at the container and folder level. By setting ACLs on the specific container folder to grant 'Read' and 'Execute' permissions only to the 'Data Reader' role (or its associated security group), you enforce least-privilege access without affecting other containers. This approach is both secure and manageable, as ACLs are inherited by default and can be centrally managed via Azure RBAC integration.
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 Storage Blob Data Reader role at the storage account level and use row-level security
Why it's wrong here
RBAC at account level applies to all containers; row-level security is not for storage.
✗
Generate a shared access signature (SAS) token for each user
Why it's wrong here
SAS tokens are less manageable and require token distribution.
✗
Configure a storage firewall to allow only the Data Reader role's IP addresses
Why it's wrong here
Firewall controls network access, not user-level permissions.
✓
Set POSIX-like access control lists (ACLs) on the container folder for the Data Reader role
Why this is correct
ACLs provide fine-grained permissions at the file/directory level for specific users/groups.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse row-level security (a database concept) with file-level security in Data Lake Storage, or they assume that a storage firewall can filter by user role, when in fact it only filters by network source IP.
Detailed technical explanation
How to think about this question
Azure Data Lake Storage Gen2 ACLs implement the POSIX.1e draft standard, supporting 'rwx' permissions for the owning user, owning group, and named users/groups. When hierarchical namespace is enabled, ACLs are evaluated before shared key or SAS authorization, and they can be set at the directory or file level using the `az storage fs access set` command or the Azure portal. A common real-world scenario is granting a data science team read access to a specific folder while preventing other teams from listing or reading its contents, which is achieved by setting default ACLs on the folder to propagate permissions to new files.
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 DP-203 question in full detail.
Design and implement data security — This question tests Design and implement data security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set POSIX-like access control lists (ACLs) on the container folder for the Data Reader role — Option D is correct because Azure Data Lake Storage Gen2 with hierarchical namespace enabled supports POSIX-like access control lists (ACLs) at the container and folder level. By setting ACLs on the specific container folder to grant 'Read' and 'Execute' permissions only to the 'Data Reader' role (or its associated security group), you enforce least-privilege access without affecting other containers. This approach is both secure and manageable, as ACLs are inherited by default and can be centrally managed via Azure RBAC integration.
What should I do if I get this DP-203 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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