Quick Answer
The correct answer is behavioral analysis, paired with signature-based detection, as these two features are most critical for preventing common web attacks. Signature-based detection relies on known attack patterns, effectively blocking threats like SQL injection or cross-site scripting that have established fingerprints, while behavioral analysis identifies anomalies and unknown attacks by establishing a baseline of normal traffic and flagging deviations. On the CISSP exam, this distinction tests your understanding of defense-in-depth within application security—specifically how a WAF must address both known and zero-day threats. A common trap is confusing SSL inspection or rate limiting as core prevention mechanisms; remember that SSL inspection handles decryption, not attack blocking, and rate limiting targets availability, not integrity or confidentiality. For a quick memory aid, think “signatures for the known, behavior for the unknown”—this pairing ensures comprehensive coverage against the OWASP Top Ten and emerging exploits.
This CISSP practice question tests your understanding of software development security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 security analyst is evaluating a web application firewall (WAF). Which TWO features are most critical for preventing common web attacks?
Virtual patching.
Why wrong: A reactive measure, not a core detection/prevention feature.
Signature-based detection.
Detects known attack signatures like SQL injection patterns.
SSL inspection.
Why wrong: Decrypts traffic for inspection but is not a detection engine itself.
Rate limiting.
Why wrong: Mitigates DoS but not web application attacks.
Behavioral analysis.
Detects anomalies and zero-day attacks based on traffic behavior.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Signature-based detection.
Signature-based detection catches known attack patterns; behavioral analysis identifies anomalies and unknown attacks. SSL inspection is for decryption, not prevention. Rate limiting is for availability. Virtual patching is a specific technique that is less critical than core detection engines.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Virtual patching.
Why it's wrong here
A reactive measure, not a core detection/prevention feature.
Signature-based detection.
Why this is correct
Detects known attack signatures like SQL injection patterns.
Related concept
Static NAT maps one inside address to one outside address.
SSL inspection.
Why it's wrong here
Decrypts traffic for inspection but is not a detection engine itself.
Rate limiting.
Why it's wrong here
Mitigates DoS but not web application attacks.
Behavioral analysis.
Why this is correct
Detects anomalies and zero-day attacks based on traffic behavior.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
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.
Detailed technical explanation
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.
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
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
What to study next
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 CISSP NAT questions on configuration and troubleshooting.
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FAQ
Software Development Security — This question tests Software Development Security — Static NAT maps one inside address to one outside address..
The correct answer is: Signature-based detection. — Signature-based detection catches known attack patterns; behavioral analysis identifies anomalies and unknown attacks. SSL inspection is for decryption, not prevention. Rate limiting is for availability. Virtual patching is a specific technique that is less critical than core detection engines.
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 CISSP NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 24, 2026
This CISSP practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CISSP exam.
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