The correct answer is to use an Azure Policy with a deny effect to restrict data access from unapproved locations. This is because a malicious insider with Contributor role can read, write, and modify data at will, so traditional monitoring or read-only roles are ineffective for prevention. Azure Policy acts as a guardrail by enforcing organizational rules at the Azure Resource Manager layer, allowing you to block data access requests that originate from outside your corporate network or specific IP ranges—directly preventing exfiltration rather than just detecting it. On the DP-203 exam, this scenario tests your understanding of the difference between detective controls (like diagnostic settings) and preventive controls, a common trap where candidates confuse logging with blocking. Remember: if the question says “prevent,” look for a policy or network rule that denies the action, not just alerts on it. Memory tip: “Prevent with Policy, detect with Diagnostics.”
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. 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.
You have an Azure Data Lake Storage Gen2 account that stores sensitive customer data. You need to implement security controls to prevent data exfiltration by a malicious insider who has Contributor role access. Which Azure feature should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Apply an Azure Policy that denies data access from unapproved locations.
Option A is correct because diagnostic settings log activity to a Log Analytics workspace, which can be used for monitoring and alerting on suspicious data access, but the question asks to prevent exfiltration. Actually, the best prevention is to use Azure Policy to restrict data access. Wait, re-reading: The question is about preventing exfiltration. The correct answer is to use Azure Policy with deny effect to restrict access to certain data. But among options, Option A (diagnostic settings) is monitoring, not prevention. Option B (Azure Policy with deny effect) is prevention. Option C (RBAC with read-only) could help but insider has Contributor. Option D (firewall rules) can restrict network access. The best is to use Azure Policy to enforce data access rules. Given the options, Option B is most relevant. However, I need to ensure correctness. Let me re-evaluate: The insider has Contributor role, which allows write/read. To prevent exfiltration, you can use Azure Policy to deny access to specific data or use service endpoints. Option B is correct because Azure Policy can enforce that data cannot be accessed from outside the corporate network. Option A is wrong because it only monitors. Option C is wrong because the user already has Contributor. Option D is wrong because firewall rules can be bypassed by the insider if they are inside the network. So correct is B.
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.
✗
Enable diagnostic settings to log all access to the storage account.
Why it's wrong here
Diagnostic settings provide monitoring but do not prevent exfiltration.
✗
Remove the Contributor role and assign a custom role with read-only permissions.
Why it's wrong here
The user already has Contributor; removing and reassigning may not prevent exfiltration if they still have read access.
✗
Configure network firewall rules to allow only trusted IP addresses.
Why it's wrong here
Firewall rules can be circumvented if the attacker uses an allowed IP.
✓
Apply an Azure Policy that denies data access from unapproved locations.
Why this is correct
Azure Policy can enforce network restrictions to prevent data exfiltration.
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: Apply an Azure Policy that denies data access from unapproved locations. — Option A is correct because diagnostic settings log activity to a Log Analytics workspace, which can be used for monitoring and alerting on suspicious data access, but the question asks to prevent exfiltration. Actually, the best prevention is to use Azure Policy to restrict data access. Wait, re-reading: The question is about preventing exfiltration. The correct answer is to use Azure Policy with deny effect to restrict access to certain data. But among options, Option A (diagnostic settings) is monitoring, not prevention. Option B (Azure Policy with deny effect) is prevention. Option C (RBAC with read-only) could help but insider has Contributor. Option D (firewall rules) can restrict network access. The best is to use Azure Policy to enforce data access rules. Given the options, Option B is most relevant. However, I need to ensure correctness. Let me re-evaluate: The insider has Contributor role, which allows write/read. To prevent exfiltration, you can use Azure Policy to deny access to specific data or use service endpoints. Option B is correct because Azure Policy can enforce that data cannot be accessed from outside the corporate network. Option A is wrong because it only monitors. Option C is wrong because the user already has Contributor. Option D is wrong because firewall rules can be bypassed by the insider if they are inside the network. So correct is B.
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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