ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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 company uses AWS Shield Advanced to protect against DDoS attacks. They notice that some legitimate traffic is being throttled during a DDoS event. The security team wants to ensure that legitimate traffic from specific business partners is not affected. Which action should they take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a rate-based rule in AWS WAF with an IP set that includes the partners' IPs and set the rate limit high for that rule.
Option B is correct because AWS WAF rate-based rules with IP sets allow you to exclude specific IP addresses from rate limiting. Option A is wrong because increasing the rate limit for the entire web ACL may still allow malicious traffic. Option C is wrong because disabling the rate-based rule removes protection. Option D is wrong because Shield Advanced does not have built-in IP whitelisting at the application layer; that is done via WAF.
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.
✗
Disable the rate-based rule in AWS WAF during the DDoS event.
Why it's wrong here
Disabling the rule removes protection and may allow the DDoS to affect the application.
✗
Increase the global rate limit in AWS Shield Advanced.
Why it's wrong here
Shield Advanced does not have a global rate limit setting; rate limiting is done via AWS WAF.
✗
Add the partners' IP addresses to the AWS Shield Advanced whitelist.
Why it's wrong here
Shield Advanced does not have a whitelist for IPs at the application layer; it operates at the network layer.
✓
Create a rate-based rule in AWS WAF with an IP set that includes the partners' IPs and set the rate limit high for that rule.
Why this is correct
This allows higher request rates for trusted IPs while still protecting against DDoS.
Related concept
Standard ACLs match source addresses.
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 ANS-C01 ACL questions on filtering logic and placement.
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Create a rate-based rule in AWS WAF with an IP set that includes the partners' IPs and set the rate limit high for that rule. — Option B is correct because AWS WAF rate-based rules with IP sets allow you to exclude specific IP addresses from rate limiting. Option A is wrong because increasing the rate limit for the entire web ACL may still allow malicious traffic. Option C is wrong because disabling the rate-based rule removes protection. Option D is wrong because Shield Advanced does not have built-in IP whitelisting at the application layer; that is done via WAF.
What should I do if I get this ANS-C01 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 ANS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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