CCSP Cloud Platform and Infrastructure Security Practice Question
A cloud security analyst is reviewing the network architecture of a VPC. The security team wants to block all traffic from a known malicious IP address at the subnet level. Which AWS network security component 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
✓
Network ACL (NACL)
NACLs (Network Access Control Lists) are stateless firewalls that operate at the subnet level and support both allow and deny rules. Security groups are stateful and only support allow rules at the instance level.
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 ACL (NACL)
Why this is correct
NACLs are stateless and allow explicit deny rules at the subnet level.
- ✗
Transit gateway
Why it's wrong here
Transit gateway acts as a hub for VPC connections, not a security filter.
- ✗
Security group
Why it's wrong here
Security groups are stateful and cannot be used to explicitly deny traffic; they only have allow rules.
- ✗
VPC peering connection
Why it's wrong here
VPC peering connects VPCs, it does not filter traffic.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CCSP practice question is part of Courseiva's free ISC2 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 CCSP exam.