CAS-004 Security Architecture Practice Question
A company is adopting a defense-in-depth strategy. Which of the following is an example of a preventive control at the network layer?
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 segmentation
Network segmentation limits lateral movement and reduces attack surface, making it a preventive network control.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Intrusion Detection System (IDS)
Why it's wrong here
IDS is detective, not preventive.
- ✗
Security Information and Event Management (SIEM)
Why it's wrong here
SIEM is for monitoring and analysis, not prevention.
- ✓
Network segmentation
Why this is correct
Segmentation prevents unauthorized access between network zones.
- ✗
Penetration testing
Why it's wrong here
Pen testing is an assessment, not a preventive control.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 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 CAS-005 exam.