- A
DDoS protection service
Why wrong: DDoS protection mitigates volumetric attacks but does not filter application-layer exploits.
- B
Network ACL
Why wrong: Network ACLs operate at the network layer and do not inspect application-layer traffic.
- C
Security group
Why wrong: Security groups provide stateful filtering at the instance level but do not inspect HTTP payloads.
- D
Web Application Firewall (WAF)
WAF inspects HTTP requests and can block SQL injection, XSS, etc.
Question 988 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 administrator needs to protect a web application from common attacks such as SQL injection and cross-site scripting (XSS). Which cloud service should be implemented?
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)
A Web Application Firewall (WAF) is specifically designed to filter and monitor HTTP traffic, blocking common web exploits like SQL injection and XSS. Cloud providers offer WAF services (e.g., AWS WAF, Azure WAF, Cloud Armor).
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 service
Why it's wrong here
DDoS protection mitigates volumetric attacks but does not filter application-layer exploits.
- ✗
Network ACL
Why it's wrong here
Network ACLs operate at the network layer and do not inspect application-layer traffic.
- ✗
Security group
Why it's wrong here
Security groups provide stateful filtering at the instance level but do not inspect HTTP payloads.
- ✓
Web Application Firewall (WAF)
Why this is correct
WAF inspects HTTP requests and can block SQL injection, XSS, etc.
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.
- →
Security — study guide chapter
Learn the concepts, then practise the questions
- →
Security practice questions
Targeted practice on this topic area only
- →
All CV0-004 questions
997 questions across all exam domains
- →
CompTIA Cloud+ CV0-004 study guide
Full concept coverage aligned to exam objectives
- →
CV0-004 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related CV0-004 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Cloud Architecture and Design practice questions
Practise CV0-004 questions linked to Cloud Architecture and Design.
Deployment practice questions
Practise CV0-004 questions linked to Deployment.
Security practice questions
Practise CV0-004 questions linked to Security.
Operations and Support practice questions
Practise CV0-004 questions linked to Operations and Support.
Troubleshooting practice questions
Practise CV0-004 questions linked to Troubleshooting.
CV0-004 fundamentals practice questions
Practise CV0-004 questions linked to CV0-004 fundamentals.
CV0-004 scenario practice questions
Practise CV0-004 questions linked to CV0-004 scenario.
CV0-004 troubleshooting practice questions
Practise CV0-004 questions linked to CV0-004 troubleshooting.
Practice this exam
Start a free CV0-004 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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) — A Web Application Firewall (WAF) is specifically designed to filter and monitor HTTP traffic, blocking common web exploits like SQL injection and XSS. Cloud providers offer WAF services (e.g., AWS WAF, Azure WAF, Cloud Armor).
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.