- A
AWS Network Firewall
Why wrong: Network Firewall provides network-layer filtering, not deep packet inspection for web attacks.
- B
AWS Shield Advanced
Why wrong: Shield protects against DDoS attacks, not application-layer attacks like SQL injection.
- C
AWS GuardDuty
Why wrong: GuardDuty is a threat detection service, not a prevention service.
- D
AWS WAF
WAF provides rule-based filtering for OWASP Top 10 threats.
Question 430 of 997
CV0-004 Security Practice Question
This CV0-004 practice question tests your understanding of security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 company running a critical web application on AWS wants to protect against SQL injection and cross-site scripting attacks. The application is behind an Application Load Balancer. Which service should be deployed to provide this protection?
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
✓
AWS WAF
AWS WAF is a web application firewall that helps protect web applications from common web exploits like SQL injection and cross-site scripting (XSS). It integrates directly with Application Load Balancers (ALB) to inspect HTTP/HTTPS traffic and filter malicious requests based on customizable rules. This makes it the correct choice for the described threat scenario.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
AWS Network Firewall
Why it's wrong here
Network Firewall provides network-layer filtering, not deep packet inspection for web attacks.
- ✗
AWS Shield Advanced
Why it's wrong here
Shield protects against DDoS attacks, not application-layer attacks like SQL injection.
- ✗
AWS GuardDuty
Why it's wrong here
GuardDuty is a threat detection service, not a prevention service.
- ✓
AWS WAF
Why this is correct
WAF provides rule-based filtering for OWASP Top 10 threats.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS WAF with AWS Shield Advanced, thinking Shield provides application-layer attack protection, but Shield focuses on DDoS mitigation while WAF handles web-specific exploits like SQL injection and XSS.
Detailed technical explanation
How to think about this question
AWS WAF uses a rule-based engine where you can define conditions such as SQL injection match conditions or XSS match conditions that inspect request components like URI, query string, or body. It integrates with ALB via web ACLs, allowing real-time inspection and blocking of malicious traffic before it reaches the application. A subtle behavior is that WAF rules are evaluated in order, and default actions (allow or block) apply to requests that don't match any rule, which can lead to unintended blocking if rules are misconfigured.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the CV0-004 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this CV0-004 question test?
Security — This question tests Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS WAF — AWS WAF is a web application firewall that helps protect web applications from common web exploits like SQL injection and cross-site scripting (XSS). It integrates directly with Application Load Balancers (ALB) to inspect HTTP/HTTPS traffic and filter malicious requests based on customizable rules. This makes it the correct choice for the described threat scenario.
What should I do if I get this CV0-004 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This CV0-004 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 CV0-004 exam.
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