- A
AWS Shield Advanced
Why wrong: AWS Shield Advanced provides enhanced protection against Distributed Denial of Service (DDoS) attacks, but it does not inspect application-layer traffic for threats like SQL injection or cross-site scripting. It is not designed for web application firewall (WAF) functionality.
- B
AWS WAF
AWS WAF is a web application firewall that monitors and filters web requests for common attack patterns such as SQL injection and cross-site scripting. It integrates with CloudFront and allows you to define custom rules to block malicious traffic before it reaches your application.
- C
Amazon GuardDuty
Why wrong: Amazon GuardDuty is a threat detection service that continuously monitors for malicious activity and unauthorized behavior using machine learning and threat intelligence. However, it does not actively block or filter incoming requests; it generates alerts and findings that require further investigation or action.
- D
AWS Firewall Manager
Why wrong: AWS Firewall Manager is a centralized management service that helps you configure and manage firewall rules across multiple accounts and resources. It can manage AWS WAF rules, but the actual filtering is performed by AWS WAF, not Firewall Manager itself. For the requirement of inspecting and blocking web exploits, you need AWS WAF directly.
Quick Answer
The answer is AWS WAF. This fully managed web application firewall is the correct choice because it integrates directly with Amazon CloudFront to inspect incoming HTTP(S) requests and block SQL injection and cross-site scripting attacks before they ever reach the origin server, using both pre-configured rule groups and custom rules authored by the security team. On the AWS Certified Cloud Practitioner CLF-C02 exam, this scenario tests your understanding of how AWS WAF acts as a frontline defense for content delivery, often appearing in questions that contrast it with services like Shield (which handles DDoS) or Security Groups (which operate at the instance level). A common trap is confusing WAF with CloudFront’s built-in caching features—remember that WAF is the filter, not the accelerator. For a quick memory tip, think “WAF = Web Application Firewall, the guard that inspects every request for SQLi and XSS before CloudFront passes it through.”
CLF-C02 Security and Compliance Practice Question
This CLF-C02 practice question tests your understanding of security and compliance. 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 company operates a global e-commerce website behind Amazon CloudFront. Security analysts have noticed a pattern of SQL injection attempts and cross-site scripting attacks targeting the web application. The company needs a fully managed service that can inspect incoming HTTP(S) requests and block these common web exploits before they reach the application origin. The solution must integrate with CloudFront and allow the security team to author custom rules. Which AWS service should the company use?
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 fully managed web application firewall that integrates directly with Amazon CloudFront to inspect HTTP(S) requests. It provides pre-configured rule groups (e.g., the SQL injection and cross-site scripting rule sets) and allows the security team to author custom rules to block common web exploits before they reach the origin. This makes it the correct choice for the described use case.
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 Shield Advanced
Why it's wrong here
AWS Shield Advanced provides enhanced protection against Distributed Denial of Service (DDoS) attacks, but it does not inspect application-layer traffic for threats like SQL injection or cross-site scripting. It is not designed for web application firewall (WAF) functionality.
- ✓
AWS WAF
Why this is correct
AWS WAF is a web application firewall that monitors and filters web requests for common attack patterns such as SQL injection and cross-site scripting. It integrates with CloudFront and allows you to define custom rules to block malicious traffic before it reaches your application.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon GuardDuty
Why it's wrong here
Amazon GuardDuty is a threat detection service that continuously monitors for malicious activity and unauthorized behavior using machine learning and threat intelligence. However, it does not actively block or filter incoming requests; it generates alerts and findings that require further investigation or action.
- ✗
AWS Firewall Manager
Why it's wrong here
AWS Firewall Manager is a centralized management service that helps you configure and manage firewall rules across multiple accounts and resources. It can manage AWS WAF rules, but the actual filtering is performed by AWS WAF, not Firewall Manager itself. For the requirement of inspecting and blocking web exploits, you need AWS WAF directly.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse AWS Shield Advanced (which handles volumetric DDoS) with AWS WAF (which handles application-layer exploits like SQL injection and XSS), leading them to select Shield Advanced when the question explicitly describes web application attacks.
Detailed technical explanation
How to think about this question
AWS WAF operates at Layer 7 (application layer) and can inspect the body, headers, and query strings of HTTP(S) requests. When integrated with CloudFront, WAF rules are evaluated at CloudFront edge locations, blocking malicious traffic before it traverses the AWS backbone. The service supports rate-based rules for additional protection against DDoS-like patterns, and custom rules can match on regex patterns, IP sets, or geographic origins.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Security and Compliance — study guide chapter
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Security and Compliance — This question tests Security and Compliance — 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 fully managed web application firewall that integrates directly with Amazon CloudFront to inspect HTTP(S) requests. It provides pre-configured rule groups (e.g., the SQL injection and cross-site scripting rule sets) and allows the security team to author custom rules to block common web exploits before they reach the origin. This makes it the correct choice for the described use case.
What should I do if I get this CLF-C02 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: Jun 11, 2026
This CLF-C02 practice question is part of Courseiva's free Amazon Web Services 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 CLF-C02 exam.
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