easyMultiple ChoiceObjective-mapped
CAS-004 WAF benefit Practice Question
Which of the following is a primary benefit of using a Web Application Firewall (WAF) in front of a web application?
⚠ Common exam trap
CompTIA often tests the misconception that a WAF provides comprehensive protection against all attacks, when in fact it is a specialized Layer 7 filter that cannot prevent network-layer attacks, business logic abuse, or vulnerabilities in the application's own code logic.
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
✓
It filters malicious HTTP requests and can block common web exploits
A Web Application Firewall (WAF) operates at Layer 7 (application layer) of the OSI model and inspects HTTP/HTTPS traffic for malicious payloads. It uses a combination of signature-based detection, behavioral analysis, and rule sets (e.g., OWASP ModSecurity Core Rule Set) to filter out common web exploits such as SQL injection, cross-site scripting (XSS), and path traversal. By intercepting and blocking malicious requests before they reach the web application, a WAF provides a critical layer of defense without requiring changes to the application code.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It encrypts all traffic between client and server
Why it's wrong here
Encryption is typically handled by TLS, not the WAF.
- ✗
It prevents all types of attacks against the application
Why it's wrong here
WAFs cannot prevent all attacks, especially logic flaws or zero-days.
- ✗
It performs static code analysis on the application
Why it's wrong here
Static code analysis is a separate process, not a WAF function.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CAS-005 exam frequently reuses these exact scenarios with slightly different constraints.
✓It filters malicious HTTP requests and can block common web exploitsCorrect answer▾
✗It encrypts all traffic between client and serverWrong answer — click to see why▾
Why this is wrong here
Encryption is typically handled by TLS, not the WAF.
✗It prevents all types of attacks against the applicationWrong answer — click to see why▾
Why this is wrong here
WAFs cannot prevent all attacks, especially logic flaws or zero-days.
✗It performs static code analysis on the applicationWrong answer — click to see why▾
Why this is wrong here
Static code analysis is a separate process, not a WAF function.
Analysis generated from the official CAS-005blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 practice question is part of Courseiva's free CompTIA 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 CAS-005 exam.