CAS-004 Security Architecture Practice Question
A security architect is implementing defense-in-depth for a critical application. Which of the following is an example of a detective control?
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
✓
Intrusion detection system
Detective controls identify and record security events after they occur; an IDS monitors traffic for suspicious activity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Data encryption
Why it's wrong here
Incorrect; encryption is a preventive/deterrent control.
- ✗
Access control list
Why it's wrong here
Incorrect; ACL is a preventive control.
- ✗
Firewall
Why it's wrong here
Incorrect; firewall is a preventive control.
- ✓
Intrusion detection system
Why this is correct
Correct; IDS monitors and alerts on potential incidents.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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