- A
AWS Network Firewall
Why wrong: AWS Network Firewall is a managed service for VPC-level traffic filtering and inspection, protecting network boundaries. It does not provide application-layer web attack protection (SQL injection, XSS) or native integration with CloudFront and ALB for web application rules.
- B
AWS Shield Advanced
Why wrong: AWS Shield Advanced provides enhanced DDoS protection for applications. It does not include application-layer rule engines to block SQL injection, XSS, or geographic requests based on country codes.
- C
AWS WAF
AWS WAF is a web application firewall that protects against common web exploits like SQL injection and XSS. It supports pre-configured managed rule sets, custom rules, and geographic (geo) blocking. It integrates directly with Amazon CloudFront and Application Load Balancer, meeting all the requirements.
- D
AWS Firewall Manager
Why wrong: AWS Firewall Manager is a security management service that centrally configures and monitors firewall rules (including AWS WAF rules) across accounts and resources. However, it does not itself provide the web application filtering or geo-blocking capabilities; it manages the underlying WAF rules. The primary service that performs the described protection is AWS WAF.
Quick Answer
The answer is AWS WAF, the correct choice because it is a fully managed web application firewall designed to protect web applications from common exploits like SQL injection and cross-site scripting (XSS) using pre-configured rule sets such as AWS Managed Rules, while also supporting geo-blocking to restrict traffic from specific countries for compliance. It integrates natively with both CloudFront and Application Load Balancers (ALBs) without requiring any additional infrastructure or custom proxies, meeting all the security team’s requirements in a single service. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your understanding of how AWS WAF fits into the shared responsibility model for application-layer security, often appearing as a scenario where you must distinguish it from services like Shield (DDoS protection) or Network Firewall (network-layer filtering). A common trap is confusing WAF with Shield Advanced, but remember: WAF handles layer 7 attacks like SQLi and XSS, while Shield focuses on DDoS. Memory tip: WAF = Web App Firewall, so think “WAF blocks the app-layer bad guys.”
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 runs a web application on Amazon CloudFront and an Application Load Balancer (ALB). The security team wants to protect the application from common web attacks such as SQL injection and cross-site scripting (XSS). Additionally, the company needs to block requests from specific countries due to compliance requirements. The security team prefers a managed service that provides pre-configured rule sets and integrates directly with CloudFront and ALB without requiring additional infrastructure. Which AWS service should the security team 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 managed web application firewall that protects web applications from common exploits like SQL injection and cross-site scripting (XSS) using pre-configured rule sets (e.g., AWS Managed Rules). It integrates natively with both CloudFront and Application Load Balancers (ALBs) without requiring additional infrastructure, and it supports geo-blocking to restrict requests from specific countries, meeting all stated requirements.
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
AWS Network Firewall is a managed service for VPC-level traffic filtering and inspection, protecting network boundaries. It does not provide application-layer web attack protection (SQL injection, XSS) or native integration with CloudFront and ALB for web application rules.
- ✗
AWS Shield Advanced
Why it's wrong here
AWS Shield Advanced provides enhanced DDoS protection for applications. It does not include application-layer rule engines to block SQL injection, XSS, or geographic requests based on country codes.
- ✓
AWS WAF
Why this is correct
AWS WAF is a web application firewall that protects against common web exploits like SQL injection and XSS. It supports pre-configured managed rule sets, custom rules, and geographic (geo) blocking. It integrates directly with Amazon CloudFront and Application Load Balancer, meeting all the requirements.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Firewall Manager
Why it's wrong here
AWS Firewall Manager is a security management service that centrally configures and monitors firewall rules (including AWS WAF rules) across accounts and resources. However, it does not itself provide the web application filtering or geo-blocking capabilities; it manages the underlying WAF rules. The primary service that performs the described protection is AWS WAF.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse AWS WAF with AWS Shield Advanced, thinking Shield Advanced provides application-layer attack protection, but Shield Advanced focuses on DDoS mitigation at the network and transport layers, not on inspecting HTTP payloads for SQL injection or XSS.
Detailed technical explanation
How to think about this question
AWS WAF uses web access control lists (ACLs) that contain rules to inspect HTTP(S) requests based on conditions such as IP addresses, HTTP headers, URI strings, and body content. For SQL injection and XSS protection, AWS WAF offers managed rule groups (e.g., AWSManagedRulesSQLiRuleSet and AWSManagedRulesCommonRuleSet) that use regex patterns and signature-based detection to block malicious payloads. Geo-blocking is implemented via geographic match conditions that map client IP addresses to country codes using MaxMind GeoIP databases, allowing or denying requests based on the originating country.
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 managed web application firewall that protects web applications from common exploits like SQL injection and cross-site scripting (XSS) using pre-configured rule sets (e.g., AWS Managed Rules). It integrates natively with both CloudFront and Application Load Balancers (ALBs) without requiring additional infrastructure, and it supports geo-blocking to restrict requests from specific countries, meeting all stated requirements.
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.
About these practice questions
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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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