- 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.
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.
When this WOULD be correct
A company needs to protect a VPC-based workload (e.g., EC2 instances) from network-level threats like port scanning or DDoS, and requires stateful inspection of all traffic entering or leaving the VPC, with no need for application-layer filtering.
- ✗
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.
When this WOULD be correct
A company needs protection against large-scale DDoS attacks targeting their CloudFront distribution and ALB, and requires 24/7 access to the DDoS Response Team (DRT) for mitigation. They also want cost protection from scaling due to DDoS attacks.
- ✓
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.
When this WOULD be correct
A company with multiple AWS accounts and resources wants to centrally deploy and manage AWS WAF rules across all accounts and resources, including CloudFront distributions and ALBs, to enforce consistent security policies. The security team needs a single tool to define and apply web ACLs across the organization, not to create the rules themselves.
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 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.
✗AWS Network FirewallWrong answer — click to see why▾
Why this is wrong here
AWS Network Firewall is a managed firewall for VPCs that filters traffic at the network and transport layers (Layer 3-4), not at the application layer. It cannot inspect HTTP requests for SQL injection or XSS, nor does it integrate directly with CloudFront or ALB for web ACLs.
★ When this WOULD be the correct answer
A company needs to protect a VPC-based workload (e.g., EC2 instances) from network-level threats like port scanning or DDoS, and requires stateful inspection of all traffic entering or leaving the VPC, with no need for application-layer filtering.
Why candidates choose this
Candidates may assume 'Network Firewall' is a general-purpose firewall that can handle all security needs, including web attacks, due to its name and managed nature, overlooking that it lacks application-layer inspection capabilities.
✗AWS Shield AdvancedWrong answer — click to see why▾
Why this is wrong here
AWS Shield Advanced provides DDoS protection but does not include pre-configured rule sets for SQL injection or XSS, nor does it offer geo-blocking capabilities. It also does not integrate directly with ALB for application-layer filtering.
★ When this WOULD be the correct answer
A company needs protection against large-scale DDoS attacks targeting their CloudFront distribution and ALB, and requires 24/7 access to the DDoS Response Team (DRT) for mitigation. They also want cost protection from scaling due to DDoS attacks.
Why candidates choose this
Candidates may confuse Shield Advanced with WAF because both are security services, and Shield Advanced includes WAF at no extra cost, leading them to think it provides the same application-layer protections.
✗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 monitors firewall rules across accounts, but it does not itself provide the pre-configured rule sets for SQL injection or XSS protection. It manages AWS WAF rules, not the rules themselves, and does not directly integrate with CloudFront and ALB for web traffic inspection.
★ When this WOULD be the correct answer
A company with multiple AWS accounts and resources wants to centrally deploy and manage AWS WAF rules across all accounts and resources, including CloudFront distributions and ALBs, to enforce consistent security policies. The security team needs a single tool to define and apply web ACLs across the organization, not to create the rules themselves.
Why candidates choose this
Candidates may confuse Firewall Manager's ability to centrally manage WAF rules with the actual WAF service that provides the pre-configured rule sets for common web attacks, assuming Firewall Manager offers built-in protection rather than just policy management.
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?”
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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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.
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Last reviewed: Jun 11, 2026
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