The correct answer is using regex patterns for PII combined with context-aware policies such as user role and destination domain. This approach is most effective because it layers content inspection with contextual analysis, allowing the DLP system to distinguish between legitimate business use of PII and actual exfiltration attempts, thereby reducing false positives without sacrificing detection accuracy. On the Certified Information Systems Auditor CISA exam, this question tests your understanding of balancing security controls with operational usability—a common trap is choosing a simple regex-only rule, which generates excessive alerts, or relying on encryption, which is not a DLP control. Remember the memory tip: “Context cuts clutter”—context-aware rules filter out noise by considering who is sending data and where it is going, making your DLP configuration both precise and practical.
CISA Protection of Information Assets Practice Question
This CISA practice question tests your understanding of protection of information assets. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 multinational corporation is deploying a data loss prevention (DLP) solution across its network. The DLP system must be configured to prevent the exfiltration of personally identifiable information (PII) while minimizing false positives. Which approach is most effective?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use regex patterns for PII combined with context-aware policies (e.g., user role, destination domain)
Option B is correct because using a combination of content-based rules and contextual analysis (e.g., destination, user role) reduces false positives while effectively detecting PII. Option A is too simplistic and may have high false positives. Option C relies heavily on user training, which is not a technical DLP control. Option D is incorrect because encrypting all traffic would break functionality and is not a DLP method.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Block all outbound email containing keywords such as 'SSN' or 'credit card'
Why it's wrong here
Keyword matching can cause high false positives and misses structured data.
✗
Require all users to complete annual data handling training and rely on self-reporting
Why it's wrong here
Training is important but not a technical DLP control.
✗
Implement full disk encryption on all endpoints and encrypt all outbound traffic
Why it's wrong here
Encryption prevents unauthorized access but does not prevent exfiltration by authorized users.
✓
Use regex patterns for PII combined with context-aware policies (e.g., user role, destination domain)
Why this is correct
Regex with context reduces false positives and accurately detects PII.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Keyword trap
Keyword matching can cause high false positives and misses structured data.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CISA NAT questions on configuration and troubleshooting.
Protection of Information Assets — This question tests Protection of Information Assets — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use regex patterns for PII combined with context-aware policies (e.g., user role, destination domain) — Option B is correct because using a combination of content-based rules and contextual analysis (e.g., destination, user role) reduces false positives while effectively detecting PII. Option A is too simplistic and may have high false positives. Option C relies heavily on user training, which is not a technical DLP control. Option D is incorrect because encrypting all traffic would break functionality and is not a DLP method.
What should I do if I get this CISA question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CISA NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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