- A
Web Application Firewall (WAF)
WAF can maintain state for session tracking.
- B
Network ACLs
Why wrong: NACLs are stateless.
- C
Route tables
Why wrong: Route tables are stateless.
- D
DDoS protection services
Why wrong: DDoS protection is not typically classified as stateful for traffic filtering.
- E
Security groups
Security groups are stateful.
Question 353 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.
A cloud engineer is tasked with securing network traffic in a VPC. Which TWO of the following are stateful security mechanisms? (Choose two.)
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
✓
Web Application Firewall (WAF)
Security groups are stateful, automatically allowing return traffic. WAF can be stateful in some implementations (e.g., tracking sessions). Network ACLs are stateless. DDoS protection is not stateful in this context. Route tables are stateless.
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.
- ✓
Web Application Firewall (WAF)
Why this is correct
WAF can maintain state for session tracking.
Related concept
Standard ACLs match source addresses.
- ✗
Network ACLs
Why it's wrong here
NACLs are stateless.
- ✗
Route tables
Why it's wrong here
Route tables are stateless.
- ✗
DDoS protection services
Why it's wrong here
DDoS protection is not typically classified as stateful for traffic filtering.
- ✓
Security groups
Why this is correct
Security groups are stateful.
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 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: Web Application Firewall (WAF) — Security groups are stateful, automatically allowing return traffic. WAF can be stateful in some implementations (e.g., tracking sessions). Network ACLs are stateless. DDoS protection is not stateful in this context. Route tables are stateless.
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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