Quick Answer
The answer is to isolate affected systems and disable compromised user accounts, as these two actions directly prevent the lateral spread of an incident while preserving forensic evidence. Isolating systems cuts off network communication to contain malware or unauthorized access, while disabling accounts stops attackers from using stolen credentials to move laterally or exfiltrate data. On the CompTIA SecurityX CAS-004 exam, this question tests your ability to distinguish containment from later phases like eradication or recovery; a common trap is confusing notification or system restoration with containment actions. Remember the mnemonic “I.D.”—Isolate systems, then Disable accounts—to lock down the threat before any cleanup begins.
This CAS-004 practice question tests your understanding of security operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
During an incident response, the team must perform containment actions. Which TWO actions are considered proper containment? (Select exactly 2.)
Isolate affected systems from the network
Isolation stops lateral movement.
Notify law enforcement
Why wrong: Notification is post-containment per policy.
Disable compromised user accounts
Disabling accounts prevents further misuse.
Back up the affected systems
Why wrong: Backup is part of recovery, not containment.
Patch all vulnerabilities on affected systems
Why wrong: Patching is eradication/remediation.
Answer choices
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 B and D are correct because isolating affected systems and disabling compromised accounts prevent further spread. Option A is recovery, not containment. Option C is notification after containment. Option E is eradication.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
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.
Related concept
Static NAT maps one inside address to one outside address.
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.
Related concept
Static NAT maps one inside address to one outside address.
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.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CAS-004 NAT questions on configuration and troubleshooting.
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FAQ
Security Operations — This question tests Security Operations — Static NAT maps one inside address to one outside address..
The correct answer is: Isolate affected systems from the network — Options B and D are correct because isolating affected systems and disabling compromised accounts prevent further spread. Option A is recovery, not containment. Option C is notification after containment. Option E is eradication.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CAS-004 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 24, 2026
This CAS-004 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-004 exam.
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