CV0-004 Security Practice Question
A security administrator is deploying a web application firewall (WAF) to protect a public-facing web application. The application experiences a high volume of traffic from a specific geographic region that is not part of the target customer base. Which WAF feature would best reduce the attack surface without impacting legitimate users?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Geo-blocking
Geo-blocking allows the administrator to block traffic from specific regions, reducing the attack surface by eliminating traffic from non-target areas.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
IP whitelisting
Why it's wrong here
Whitelisting permits only named addresses, so legitimate users from anywhere outside the list are blocked, directly contradicting the requirement not to impact them. It suits tightly controlled admin interfaces or partner-only endpoints. Geo-blocking the unwanted region is the mechanism that reduces the attack surface while leaving the target customer base reachable.
- ✗
Rate limiting
Why it's wrong here
Rate limiting caps request frequency per client, throttling volumetric abuse but still admitting traffic from the unwanted region and potentially delaying legitimate users during bursts. It suits mitigating brute-force or scraping attempts. Geo-blocking by source region is the mechanism that excludes the non-customer region outright.
- ✗
OWASP rule set
Why it's wrong here
The OWASP rule set inspects request payloads for injection and similar flaws; it does not restrict traffic by origin, so requests from the unwanted region still reach the application. It is the right choice when the requirement is defending against common application-layer exploits such as SQL injection or cross-site scripting.
- ✓
Geo-blocking
Why this is correct
Geo-blocking filters traffic by source country, dropping requests from the unwanted region at the WAF before they reach the application. Legitimate users elsewhere remain unaffected, reducing the attack surface from that region's hostile traffic without disrupting the target customer base.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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