- A
DDoS protection
Why wrong: DDoS protection is for mitigating distributed denial-of-service attacks, not for stateful traffic management.
- B
Web Application Firewall
Why wrong: WAF is for HTTP/HTTPS traffic filtering, not for managing stateful response traffic.
- C
Security groups
Security groups are stateful and automatically allow return traffic.
- D
Network ACLs
Why wrong: NACLs are stateless and require explicit outbound rules for response traffic.
Question 75 of 997
CV0-004 Security Practice Question
This CV0-004 practice question tests your understanding of 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.
An organization uses AWS and wants to control inbound traffic to its EC2 instances. They need a solution that automatically allows response traffic for any permitted inbound request. Which of the following should they 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
✓
Security groups
Security groups are stateful, meaning if you allow inbound traffic, the response is automatically allowed regardless of outbound rules. Network ACLs are stateless and require explicit rules for both directions.
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.
- ✗
DDoS protection
Why it's wrong here
DDoS protection is for mitigating distributed denial-of-service attacks, not for stateful traffic management.
- ✗
Web Application Firewall
Why it's wrong here
WAF is for HTTP/HTTPS traffic filtering, not for managing stateful response traffic.
- ✓
Security groups
Why this is correct
Security groups are stateful and automatically allow return traffic.
Related concept
Standard ACLs match source addresses.
- ✗
Network ACLs
Why it's wrong here
NACLs are stateless and require explicit outbound rules for response traffic.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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 CV0-004 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this CV0-004 question test?
Security — This question tests Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Security groups — Security groups are stateful, meaning if you allow inbound traffic, the response is automatically allowed regardless of outbound rules. Network ACLs are stateless and require explicit rules for both directions.
What should I do if I get this CV0-004 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 CV0-004 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jul 4, 2026
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.
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