The answer is to implement private endpoints and access control lists (ACLs). Private endpoints are correct because they secure Azure Data Lake Storage Gen2 by ensuring all data traffic flows through a private IP address on your virtual network, never traversing the public internet, which directly prevents unauthorized external access. ACLs are correct because they provide fine-grained, POSIX-like permissions at the directory and file level, allowing you to restrict access to sensitive data even within the storage account itself. On the DP-203 exam, this question tests your understanding of layered security for ADLS Gen2, often appearing as a multi-select scenario where you must distinguish between network-level controls (private endpoints) and identity-based controls (ACLs). A common trap is confusing CORS, which is for browser-based cross-origin requests, with actual security controls, or assuming a default read ACL for authenticated users is safe—it is not, as it grants overly broad access. Memory tip: think “network lock plus file-level gate” for private endpoints and ACLs.
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 securing an Azure Data Lake Storage Gen2 account that contains sensitive data. Which TWO of the following should you implement to protect data from unauthorized access?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure ACLs to grant least privilege to users and groups
Option A is correct because private endpoints ensure data traffic does not traverse the public internet. Option C is correct because ACLs provide fine-grained access control at the directory/file level. Option B is wrong because cross-origin resource sharing (CORS) is for web applications, not security. Option D is wrong because a default ACL of 'read' for all authenticated users would grant broad access. Option E is wrong because large file shares are for Azure Files, not ADLS Gen2.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Configure ACLs to grant least privilege to users and groups
Why this is correct
ACLs allow granular permissions at the file and directory level.
Related concept
Authentication checks who the user is.
✓
Use private endpoints to restrict access to the storage account
Why this is correct
Private endpoints ensure traffic stays within the Microsoft network.
Related concept
Authentication checks who the user is.
✗
Set the default ACL to allow read access for all authenticated users
Why it's wrong here
This would grant broad read access, opposite of least privilege.
✗
Enable CORS rules to allow only specific origins
Why it's wrong here
CORS is for browser-based access, not a security control for unauthorized access.
✗
Enable large file shares on the storage account
Why it's wrong here
Large file shares is a feature for Azure Files, not ADLS Gen2.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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 Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related DP-203 questions on access control and AAA configuration.
Secure, monitor, and optimize data storage and data processing — This question tests Secure, monitor, and optimize data storage and data processing — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Configure ACLs to grant least privilege to users and groups — Option A is correct because private endpoints ensure data traffic does not traverse the public internet. Option C is correct because ACLs provide fine-grained access control at the directory/file level. Option B is wrong because cross-origin resource sharing (CORS) is for web applications, not security. Option D is wrong because a default ACL of 'read' for all authenticated users would grant broad access. Option E is wrong because large file shares are for Azure Files, not ADLS Gen2.
What should I do if I get this DP-203 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related DP-203 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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Question Discussion
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