ADLS Gen2 ACL Execute Permission — Why You Can't List Files | Azure Data Engineer Associate Explained
This DP-203 practice question tests your understanding of design and develop data processing. 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.
Network Topology
Refer to the exhibit. A user with Storage Blob Data Reader role on the container rawdata cannot list files under /2023/07/. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Network Topology
A
The directory ACL does not grant 'execute' permission to the user
To list directory contents, the user needs execute permission on the directory. 'other' has no permissions, so the user (not being owner or group) is denied.
B
The user does not have Storage Blob Data Contributor role
Why wrong: Reader role is sufficient to list files if ACLs allow; the issue is ACLs, not role level.
C
The user is not the owner of the directory
Why wrong: Ownership is not required for listing; appropriate ACLs are needed.
D
The container name is misspelled
Why wrong: The exhibit shows correct container name; error is due to ACLs.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The directory ACL does not grant 'execute' permission to the user
In Azure Data Lake Storage Gen2, listing files in a directory requires both read (r) and execute (x) permissions on the directory itself. The Storage Blob Data Reader role grants read access to blob data but does not automatically grant the execute permission on directory ACLs. Without execute permission on the /2023/07/ directory, the user cannot traverse or list its contents, even though they can read blobs they know the path to.
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.
✓
The directory ACL does not grant 'execute' permission to the user
Why this is correct
To list directory contents, the user needs execute permission on the directory. 'other' has no permissions, so the user (not being owner or group) is denied.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The user does not have Storage Blob Data Contributor role
Why it's wrong here
Reader role is sufficient to list files if ACLs allow; the issue is ACLs, not role level.
✗
The user is not the owner of the directory
Why it's wrong here
Ownership is not required for listing; appropriate ACLs are needed.
✗
The container name is misspelled
Why it's wrong here
The exhibit shows correct container name; error is due to ACLs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume the Storage Blob Data Reader role is sufficient for all read operations, but Azure Data Lake Storage Gen2 requires explicit ACL execute permission on directories for listing and traversal, which is a common point of confusion between flat blob storage and hierarchical namespace storage.
Trap categories for this question
Command / output trap
The exhibit shows correct container name; error is due to ACLs.
Detailed technical explanation
How to think about this question
Azure Data Lake Storage Gen2 uses POSIX-like ACLs where directories require execute (x) permission for traversal (the 'search' bit). This is analogous to Unix filesystem behavior: without x on a directory, you cannot list its entries even if you have read permission on the files inside. The Storage Blob Data Reader role maps to 'read' on blobs but does not include the 'execute' ACL permission on directories, which must be set explicitly via ACL entries.
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 develop data processing — This question tests Design and develop data processing — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The directory ACL does not grant 'execute' permission to the user — In Azure Data Lake Storage Gen2, listing files in a directory requires both read (r) and execute (x) permissions on the directory itself. The Storage Blob Data Reader role grants read access to blob data but does not automatically grant the execute permission on directory ACLs. Without execute permission on the /2023/07/ directory, the user cannot traverse or list its contents, even though they can read blobs they know the path to.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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