CLF-C02 Security and Compliance Practice Question
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?
⚠ Common exam trap
It's easy for candidates to 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.
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.
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.
When this WOULD be correct
A company needs protection against DDoS attacks for a CloudFront distribution and requires 24/7 access to the DDoS Response Team (DRT) and cost protection against scaling charges during an attack.
- ✓
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.
- ✗
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.
When this WOULD be correct
A company wants to continuously monitor AWS accounts and workloads for malicious activity, such as unusual API calls or potentially compromised instances, and needs automated threat detection without deploying additional software. GuardDuty would be the correct answer.
- ✗
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.
When this WOULD be correct
A company with multiple AWS accounts and resources wants to centrally enforce a common set of WAF rules across all CloudFront distributions and Application Load Balancers. The security team needs to ensure consistent protection without manually configuring each resource. In this scenario, AWS Firewall Manager would be the correct answer because it provides centralized policy management for AWS WAF, AWS Shield Advanced, and other firewall services.
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 CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓AWS WAFCorrect answer▾
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.
✗AWS Shield AdvancedWrong answer — click to see why▾
Why this is wrong here
AWS Shield Advanced provides DDoS protection but does not inspect HTTP(S) requests for SQL injection or cross-site scripting attacks, nor does it allow custom rule authoring for web exploits.
★ When this WOULD be the correct answer
A company needs protection against DDoS attacks for a CloudFront distribution and requires 24/7 access to the DDoS Response Team (DRT) and cost protection against scaling charges during an attack.
Why candidates choose this
Candidates may confuse Shield Advanced with a web application firewall because both offer security for CloudFront, but Shield Advanced focuses on DDoS mitigation, not application-layer inspection.
✗Amazon GuardDutyWrong answer — click to see why▾
Why this is wrong here
Amazon GuardDuty is a threat detection service that monitors for malicious activity and unauthorized behavior, but it does not inspect or block HTTP(S) requests at the application layer. It cannot prevent SQL injection or XSS attacks.
★ When this WOULD be the correct answer
A company wants to continuously monitor AWS accounts and workloads for malicious activity, such as unusual API calls or potentially compromised instances, and needs automated threat detection without deploying additional software. GuardDuty would be the correct answer.
Why candidates choose this
Candidates may confuse GuardDuty's threat detection capabilities with web application security, assuming it can block attacks because it identifies malicious patterns.
✗AWS Firewall ManagerWrong answer — click to see why▾
Why this is wrong here
AWS Firewall Manager is a policy management service that centrally configures and manages firewall rules across multiple accounts and resources, but it does not itself inspect HTTP(S) requests or block web exploits like SQL injection or XSS. It can manage AWS WAF rules, but the question asks for the service that directly inspects and blocks these attacks, which is AWS WAF.
★ When this WOULD be the correct answer
A company with multiple AWS accounts and resources wants to centrally enforce a common set of WAF rules across all CloudFront distributions and Application Load Balancers. The security team needs to ensure consistent protection without manually configuring each resource. In this scenario, AWS Firewall Manager would be the correct answer because it provides centralized policy management for AWS WAF, AWS Shield Advanced, and other firewall services.
Why candidates choose this
Candidates may confuse Firewall Manager with a firewall service itself, thinking it provides direct inspection and blocking capabilities, when in fact it is a policy management tool that orchestrates other services like AWS WAF.
Analysis generated from the official CLF-C02blueprint 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 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.