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CAS-004 Practice Question: During an incident response, the team must…
During an incident response, the team must perform containment actions. Which TWO actions are considered proper containment? (Select exactly 2.)
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
✓
Isolate affected systems from the network
Options A and C are correct. Isolating affected systems (A) prevents the spread of an incident by disconnecting compromised hosts from the network, which is a classic containment action. Disabling compromised user accounts (C) stops an attacker from using stolen credentials to access resources, also a containment measure. Option B (notify law enforcement) is a communication step that may happen after containment, not a containment action itself. Option D (back up affected systems) is typically done during evidence collection before containment, or after containment for recovery, but is not a containment action. Option E (patch all vulnerabilities) is part of eradication, not the immediate containment phase.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Isolate affected systems from the network
Why this is correct
Isolation stops lateral movement.
- ✗
Notify law enforcement
Why it's wrong here
Notification is post-containment per policy.
- ✓
Disable compromised user accounts
Why this is correct
Disabling accounts prevents further misuse.
- ✗
Back up the affected systems
Why it's wrong here
Backup is part of recovery, not containment.
- ✗
Patch all vulnerabilities on affected systems
Why it's wrong here
Patching is eradication/remediation.
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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.