The correct answer is the AWS Managed Rules for Cross-site scripting (XSS) rule group, a Rate-based rule, and the AWS Managed Rules for SQL injection rule group. These three rule groups work together to block malicious payloads like XSS and SQL injection while also enforcing a request rate limit per IP, directly addressing the security engineer’s requirements for an Application Load Balancer. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of how managed rule groups handle specific threat vectors versus other rule types like IP sets or geographic match rules, which are designed for static allow/deny or location-based blocking, not behavioral rate control. A common trap is confusing a rate-based rule with an IP set rule—remember that rate limiting is about request frequency, not IP reputation. Memory tip: “XSS, SQL, and Rate—three guards at the gate.”
SCS-C02 Infrastructure Security Practice Question
This SCS-C02 practice question tests your understanding of infrastructure security. 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. 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 security engineer is configuring an AWS WAF web ACL for an Application Load Balancer. The engineer wants to block requests that contain cross-site scripting (XSS) and also limit the rate of requests from a single IP. Which THREE rule groups should be added?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Rate-based rule
Options A, C, and E are correct. The AWS Managed Rules for XSS (A) and Rate-based rules (C) address the requirements, and the SQL injection rule group (E) is commonly included for comprehensive protection. Option B is wrong because an IP set rule allows/denies specific IPs, not rate limiting. Option D is wrong because geographic match rules are for location-based blocking, not behavior.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 Managed Rules - IP reputation rule group
Why it's wrong here
IP reputation lists block known malicious IPs, but does not rate limit.
✓
Rate-based rule
Why this is correct
Rate-based rules limit the number of requests from an IP over a time period.
Related concept
Standard ACLs match source addresses.
✓
AWS Managed Rules - SQL injection rule group
Why this is correct
While not explicitly requested, this is a common addition and the question asks for THREE groups; SQL injection is a typical choice.
Related concept
Standard ACLs match source addresses.
✓
AWS Managed Rules - Cross-site scripting (XSS) rule group
Why this is correct
This rule group detects and blocks XSS attacks.
Related concept
Standard ACLs match source addresses.
✗
Geographic match rule
Why it's wrong here
Geographic match rules block or allow based on country, not rate limiting.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SCS-C02 ACL questions on filtering logic and placement.
Infrastructure Security — This question tests Infrastructure Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Rate-based rule — Options A, C, and E are correct. The AWS Managed Rules for XSS (A) and Rate-based rules (C) address the requirements, and the SQL injection rule group (E) is commonly included for comprehensive protection. Option B is wrong because an IP set rule allows/denies specific IPs, not rate limiting. Option D is wrong because geographic match rules are for location-based blocking, not behavior.
What should I do if I get this SCS-C02 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SCS-C02 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A security engineer is designing a web application that will run on EC2 instances behind an Application Load Balancer (ALB). The application must be protected from common web exploits like SQL injection and cross-site scripting. Which AWS service should be used to provide this protection?
medium
✓ A.AWS WAF
B.Network ACLs
C.Security Groups
D.AWS Shield Advanced
Why A: Option B is correct because AWS WAF is a web application firewall that protects against common web exploits. Option A is wrong because Shield Advanced provides DDoS protection, not application-layer attacks. Option C is wrong because Network ACLs are stateless firewalls at the subnet level. Option D is wrong because Security Groups are stateful firewalls at the instance level.
Variation 2. A company uses AWS WAF to protect a web application. The security team wants to block requests that contain SQL injection patterns. Which WAF rule type should be used?
medium
A.IP set rule
B.Geographic match rule
C.Rate-based rule
✓ D.SQL injection match rule
Why D: Option D is correct because AWS WAF provides a dedicated SQL injection match rule that inspects incoming requests for SQL injection patterns in the URI, query string, or body. This rule uses a set of predefined SQL-like patterns (e.g., 'OR 1=1', 'UNION SELECT') to detect and block malicious input, directly addressing the security team's requirement.
Variation 3. A company uses AWS WAF to protect its web application from common web exploits. The security team wants to block requests that contain SQL injection or cross-site scripting (XSS) in the query string. Which rule type should be used?
hard
A.Custom regex pattern set
✓ B.Managed rule group for SQL injection and XSS
C.Rate-based rule
D.Geographic match rule
Why B: Option B is correct because AWS WAF has managed rule groups for SQL injection and XSS. Option A is wrong because rate-based rules are for rate limiting. Option C is wrong because geographic rules are for location-based blocking. Option D is wrong because regex patterns are custom, but managed rules are more comprehensive.
Variation 4. A company wants to use AWS WAF to protect its web application from common web exploits. Which AWS service must be integrated with AWS WAF to provide this protection?
easy
A.Security Groups
✓ B.Application Load Balancer or Amazon CloudFront
C.Amazon Route 53
D.Network ACLs
Why B: Option B is correct because AWS WAF is integrated with CloudFront and ALB to filter requests. Option A is wrong because Network ACLs are stateless and not application-layer. Option C is wrong because Security Groups are stateful firewalls at the instance level. Option D is wrong because Route 53 is DNS, not a web traffic endpoint.
Variation 5. A company's security engineer is configuring a web application firewall (WAF) to protect a public-facing Application Load Balancer (ALB). The application is vulnerable to SQL injection attacks. Which AWS WAF rule should be used to mitigate this threat?
medium
A.Add a rule to block cross-site scripting (XSS) attacks.
✓ B.Add a rule from the AWS Managed Rules for SQL injection.
C.Add a rate-based rule to limit requests per IP.
D.Add a geographic match rule to block traffic from specific countries.
Why B: Option A is correct. AWS WAF has a managed rule group called SQLi that specifically blocks SQL injection attempts. Option B (Rate-based rule) is for DDoS. Option C (Cross-site scripting) is for XSS. Option D (Geographic match) is for geo-blocking.
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Question Discussion
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