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Infrastructure Security →mediumMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is to add a rule with an IP set condition that allows the partner’s IP as an exception to the rate-based rule. This works because AWS WAF evaluates rules in order, so a higher-priority allow rule for the specific IP set will match first, exempting that traffic from the rate-based rule while all other traffic remains subject to the rate limit. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of how to create granular exceptions within a WAF policy without weakening overall security—a common trap is confusing a web ACL-level whitelist (which bypasses all rules) with a targeted IP set exception. Remember that rate-based rules apply to aggregate traffic, not individual IPs, so you must use a separate allow rule with an IP set condition to carve out a specific address. Memory tip: think of it as “allow first, then rate-limit the rest.”

SCS-C02 Infrastructure Security Practice Question

This SCS-C02 practice question tests your understanding of infrastructure security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 is using AWS WAF to protect a web application. The security team notices that a specific IP address is generating a high volume of requests and triggering the WAF rate-based rule. However, the IP address is a legitimate partner's static IP. What should the security team do to allow this IP while still protecting against other malicious traffic?

Question 1mediummultiple choice

Full question →

A
Add a rule with an IP set condition that allows the partner's IP as an exception to the rate-based rule.
This allows the partner's IP to exceed the rate limit while other traffic is still rate-limited.
B
Create an IP set and whitelist the IP address in the web ACL default action.
Why wrong: Whitelisting in the web ACL would bypass all rules, not just the rate-based rule, potentially allowing other threats.
C
Increase the rate limit for the rate-based rule to accommodate the partner's traffic.
Why wrong: Increasing the rate limit would affect all traffic, reducing protection against high-volume attacks.
D
Disable the rate-based rule for the partner's IP by modifying the rule scope.
Why wrong: Rate-based rules cannot be disabled for specific IPs; exceptions must be configured using IP sets.

Full breakdown with real-world context →

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

✓

Add a rule with an IP set condition that allows the partner's IP as an exception to the rate-based rule.

Option C is correct because adding a WAF IP set condition that allows the partner's IP as an exception to the rate-based rule ensures that legitimate traffic is not blocked while other traffic is still subject to the rule. Option A is wrong because whitelisting the IP in the web ACL would bypass all rules, not just the rate-based rule. Option B is wrong because increasing the rate limit would affect all traffic, potentially allowing malicious traffic. Option D is wrong because WAF rate-based rules cannot be disabled for a specific IP directly; an IP set condition is needed.

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.

✓
Add a rule with an IP set condition that allows the partner's IP as an exception to the rate-based rule.
Why this is correct
This allows the partner's IP to exceed the rate limit while other traffic is still rate-limited.
Related concept
Standard ACLs match source addresses.
✗
Create an IP set and whitelist the IP address in the web ACL default action.
Why it's wrong here
Whitelisting in the web ACL would bypass all rules, not just the rate-based rule, potentially allowing other threats.
✗
Increase the rate limit for the rate-based rule to accommodate the partner's traffic.
Why it's wrong here
Increasing the rate limit would affect all traffic, reducing protection against high-volume attacks.
✗
Disable the rate-based rule for the partner's IP by modifying the rule scope.
Why it's wrong here
Rate-based rules cannot be disabled for specific IPs; exceptions must be configured using IP sets.

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.

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FAQ

Questions learners often ask

What does this SCS-C02 question test?

Infrastructure Security — This question tests Infrastructure Security — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Add a rule with an IP set condition that allows the partner's IP as an exception to the rate-based rule. — Option C is correct because adding a WAF IP set condition that allows the partner's IP as an exception to the rate-based rule ensures that legitimate traffic is not blocked while other traffic is still subject to the rule. Option A is wrong because whitelisting the IP in the web ACL would bypass all rules, not just the rate-based rule. Option B is wrong because increasing the rate limit would affect all traffic, potentially allowing malicious traffic. Option D is wrong because WAF rate-based rules cannot be disabled for a specific IP directly; an IP set condition is needed.

What should I do if I get this SCS-C02 question wrong?

What is the key concept behind this question?

Standard ACLs match source addresses.

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This SCS-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 SCS-C02 exam.