CAS-004 Security Operations Practice Question
During an incident response, a team is prioritizing containment actions. Which THREE of the following actions should be taken to contain the incident effectively?
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
✓
Blocking malicious IP addresses at the firewall
Containment focuses on stopping the spread and limiting damage. Blocking malicious IPs at the firewall, isolating affected systems from the network, and disabling compromised user accounts are key containment steps. Collecting forensic images is part of evidence preservation, not containment, and notifying law enforcement is optional and not a containment action.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Blocking malicious IP addresses at the firewall
Why this is correct
This prevents further communication with the attacker.
- ✗
Notifying law enforcement
Why it's wrong here
Notification is not a containment action.
- ✗
Collecting forensic images of affected systems
Why it's wrong here
This is evidence preservation, not containment.
- ✓
Isolating affected systems from the network
Why this is correct
Isolation prevents lateral movement.
- ✓
Disabling compromised user accounts
Why this is correct
This stops unauthorized access.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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