CV0-004 Security Practice Question
A cloud administrator is configuring network security for a multi-tier application. Which TWO statements about security groups and network ACLs are correct?
⚠ Common exam trap
Many exam-takers confuse stateful security groups with stateless network ACLs, leading candidates to incorrectly think security groups can deny specific IPs or that network ACLs are evaluated first, when in fact security groups are evaluated at the instance level before network ACLs at the subnet boundary.
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
✓
Network ACLs are stateless and require explicit allow rules for both inbound and outbound traffic.
Network ACLs are stateless, meaning they do not automatically allow return traffic; you must explicitly define allow rules for both inbound and outbound traffic. Option E is correct because security groups are stateful and support only allow rules; you cannot create a deny rule within a security group, and any traffic not explicitly allowed is implicitly denied.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Network ACLs evaluate rules before security groups.
Why it's wrong here
Network ACLs evaluate at subnet level before security groups, but this statement is about order, not security group statefulness.
- ✗
Security groups can be used to deny traffic from specific IP addresses.
Why it's wrong here
Security groups cannot deny; they only allow.
- ✗
Security groups are stateless.
Why it's wrong here
Security groups are stateful, not stateless.
- ✓
Network ACLs are stateless and require explicit allow rules for both inbound and outbound traffic.
Why this is correct
Stateless means each direction must be explicitly allowed.
- ✓
Security groups support allow rules only.
Why this is correct
Security groups only allow; they do not have deny rules.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.