- A
AWS Shield Advanced
Why wrong: AWS Shield Advanced provides enhanced protection against distributed denial-of-service (DDoS) attacks. It is not designed to inspect application-layer payloads for SQL injection or XSS. While it can be used in conjunction with AWS WAF, Shield Advanced alone does not offer the rule-based filtering needed for these specific web exploits.
- B
Amazon GuardDuty
Why wrong: Amazon GuardDuty is a threat detection service that continuously monitors for malicious activity and unauthorized behavior across AWS accounts, workloads, and data sources (e.g., CloudTrail logs, VPC Flow Logs, DNS logs). It does not function as a web application firewall and cannot block specific web requests at the application layer.
- C
AWS WAF
AWS WAF is a fully managed web application firewall that enables customers to monitor and control HTTP(S) requests to their applications. It provides managed rule groups for common threats like SQL injection and cross-site scripting (XSS). The service integrates seamlessly with Application Load Balancers, allowing traffic to be inspected at the edge before reaching the backend instances, and requires no server management.
- D
AWS Network Firewall
Why wrong: AWS Network Firewall is a managed firewall service that provides network-level filtering for VPC traffic, including stateful and stateless inspection and intrusion prevention. It operates at Layers 3 and 4, not at the application layer (Layer 7). While it can provide some threat protection, it is not designed to inspect application-layer attacks like SQL injection or XSS, and it does not offer the pre-configured web-application rule sets that AWS WAF provides.
CLF-C02 Security and Compliance Practice Question
This CLF-C02 practice question tests your understanding of security and compliance. 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. A key principle to apply: aWS WAF operates at Layer 7 (application layer) to inspect HTTP(S) requests.. 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 hosts a web application on Amazon EC2 instances behind an Application Load Balancer. The security team wants to protect the application from common web attacks such as SQL injection and cross-site scripting (XSS) at the edge, before the requests reach the application. The company wants to use pre-built rule sets maintained by AWS to quickly enable protection, and the solution should be fully managed with no servers to manage. 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 helps protect web applications from common web exploits like SQL injection and cross-site scripting (XSS). It integrates with Application Load Balancers (ALBs) and allows you to use pre-built, AWS-managed rule sets (e.g., the AWS Managed Rules for SQL injection and XSS) to quickly enable protection at the edge, before traffic reaches the EC2 instances. This meets the requirement for a serverless, managed solution with no infrastructure to maintain.
Key principle: AWS WAF operates at Layer 7 (application layer) to inspect HTTP(S) requests.
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. It is not designed to inspect application-layer payloads for SQL injection or XSS. While it can be used in conjunction with AWS WAF, Shield Advanced alone does not offer the rule-based filtering needed for these specific web exploits.
- ✗
Amazon GuardDuty
Why it's wrong here
Amazon GuardDuty is a threat detection service that continuously monitors for malicious activity and unauthorized behavior across AWS accounts, workloads, and data sources (e.g., CloudTrail logs, VPC Flow Logs, DNS logs). It does not function as a web application firewall and cannot block specific web requests at the application layer.
- ✓
AWS WAF
Why this is correct
AWS WAF is a fully managed web application firewall that enables customers to monitor and control HTTP(S) requests to their applications. It provides managed rule groups for common threats like SQL injection and cross-site scripting (XSS). The service integrates seamlessly with Application Load Balancers, allowing traffic to be inspected at the edge before reaching the backend instances, and requires no server management.
Related concept
AWS WAF operates at Layer 7 (application layer) to inspect HTTP(S) requests.
- ✗
AWS Network Firewall
Why it's wrong here
AWS Network Firewall is a managed firewall service that provides network-level filtering for VPC traffic, including stateful and stateless inspection and intrusion prevention. It operates at Layers 3 and 4, not at the application layer (Layer 7). While it can provide some threat protection, it is not designed to inspect application-layer attacks like SQL injection or XSS, and it does not offer the pre-configured web-application rule sets that AWS WAF provides.
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, mistakenly thinking Shield Advanced handles application-layer attacks like SQL injection, when in fact it focuses on DDoS mitigation at the network and transport layers.
Detailed technical explanation
How to think about this question
AWS WAF operates at Layer 7 (HTTP/HTTPS) and uses web access control lists (web ACLs) to inspect request headers, body, and URI strings against conditions such as SQL-like patterns or script tags. The AWS Managed Rules for SQL injection (e.g., SQLi_RuleGroup) and XSS (e.g., XSS_RuleGroup) are regularly updated by AWS to cover evolving attack vectors, and they can be attached to an ALB, CloudFront, or API Gateway. In a real-world scenario, a company might combine WAF with rate-based rules to also mitigate brute-force login attempts, while still relying on Shield Advanced for volumetric DDoS protection.
KKey Concepts to Remember
- AWS WAF operates at Layer 7 (application layer) to inspect HTTP(S) requests.
- AWS WAF protects against common web exploits like SQL injection and XSS.
- AWS WAF offers AWS Managed Rules for quick, pre-built protection.
- AWS WAF is a fully managed service with no servers to provision or manage.
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
AWS WAF operates at Layer 7 (application layer) to inspect HTTP(S) requests.
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.
Review aWS WAF operates at Layer 7 (application layer) to inspect HTTP(S) requests., then practise related CLF-C02 questions on the same topic to reinforce the concept.
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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 — AWS WAF operates at Layer 7 (application layer) to inspect HTTP(S) requests..
What is the correct answer to this question?
The correct answer is: AWS WAF — AWS WAF is a fully managed web application firewall that helps protect web applications from common web exploits like SQL injection and cross-site scripting (XSS). It integrates with Application Load Balancers (ALBs) and allows you to use pre-built, AWS-managed rule sets (e.g., the AWS Managed Rules for SQL injection and XSS) to quickly enable protection at the edge, before traffic reaches the EC2 instances. This meets the requirement for a serverless, managed solution with no infrastructure to maintain.
What should I do if I get this CLF-C02 question wrong?
Review aWS WAF operates at Layer 7 (application layer) to inspect HTTP(S) requests., then practise related CLF-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
AWS WAF operates at Layer 7 (application layer) to inspect HTTP(S) requests.
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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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