The correct answer is to use the Azure portal to set ACLs on the root directory, granting execute permission to the data-engineers group without read permission. This works because Azure Data Lake Storage Gen2’s POSIX-compliant ACLs allow you to set granular permissions at the directory level, decoupling execute (X) from read (R)—a capability that RBAC roles cannot achieve, as they apply broad, coarse-grained access at the storage account scope. On the DP-203 exam, this scenario tests your understanding of how ACLs override default RBAC behavior in a hierarchical namespace, often appearing as a trick where candidates mistakenly choose a role assignment or firewall rule. A common trap is assuming RBAC’s Storage Blob Data Contributor grants execute, but it actually includes read, violating the requirement. Remember the mnemonic: “ACLs for fine-grain, RBAC for the domain”—when you need execute without read, ACLs are your only lane.
DP-203 Practice Question: Secure, monitor, and optimize data storage and data processing
This DP-203 practice question tests your understanding of secure, monitor, and optimize data storage and data processing. 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 are reviewing the ARM template above. The storage account is created with hierarchical namespace enabled (isHnsEnabled: true). After deployment, you need to ensure that the 'data-engineers' group can execute but not read the contents of the root directory. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the Azure portal to set ACLs on the root directory, granting execute permission to the data-engineers group without read permission
Option B is correct because ACLs are the way to set execute permissions at the root directory without granting read. Option A is wrong because RBAC roles at the storage account level grant broad permissions. Option C is wrong because the hierarchical namespace is already enabled. Option D is wrong because firewall rules control network access.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Modify the ARM template to set the 'isHnsEnabled' property to false and redeploy
Why it's wrong here
Disabling hierarchical namespace would remove ACL capability, not help.
✗
Assign the Storage Blob Data Reader role to the data-engineers group at the storage account level
Why it's wrong here
This would grant read access to all containers, not just execute at root.
✗
Configure a firewall rule to allow only the data-engineers group's IP addresses
Why it's wrong here
Firewall rules control network access, not data permissions.
✓
Use the Azure portal to set ACLs on the root directory, granting execute permission to the data-engineers group without read permission
Why this is correct
ACLs allow granular permissions; execute alone allows traversal but not listing contents.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DP-203 ACL questions on filtering logic and placement.
Secure, monitor, and optimize data storage and data processing — This question tests Secure, monitor, and optimize data storage and data processing — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Use the Azure portal to set ACLs on the root directory, granting execute permission to the data-engineers group without read permission — Option B is correct because ACLs are the way to set execute permissions at the root directory without granting read. Option A is wrong because RBAC roles at the storage account level grant broad permissions. Option C is wrong because the hierarchical namespace is already enabled. Option D is wrong because firewall rules control network access.
What should I do if I get this DP-203 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DP-203 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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