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Quick Answer
The answer is isolating affected systems from the network immediately, identifying the initial infection vector through log analysis, and blocking the ransomware’s command and control (C2) communication at the firewall. These three actions are correct because containment focuses on halting lateral movement via protocols like SMB or RDP, while eradication requires removing the root cause—such as a phishing link or unpatched vulnerability—and cutting off the attacker’s ability to re-encrypt or exfiltrate data. On the CompTIA CySA+ CS0-003 exam, this question tests your ability to distinguish between containment (stopping spread) and eradication (removing the threat), with a common trap being to select “restoring from backup” too early, as that is a recovery phase action. A helpful memory tip is “ICE”: Isolate, Check logs, Eradicate C2—remember that you must stop the bleed before you clean the wound.
CS0-003 Incident Response and Management Practice Question
This CS0-003 practice question tests your understanding of incident response and management. 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.
An organization has detected a ransomware outbreak that has encrypted critical file servers. The incident response team has activated the plan. Which three of the following actions should be taken during the containment and eradication phases? (Choose three.)
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 immediately.
Isolating affected systems from the network immediately is correct because it stops the ransomware from spreading laterally to other hosts via SMB, RDP, or other network protocols. This containment step is critical to limit the scope of the outbreak and protect unencrypted assets.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between containment (immediate isolation) and eradication (removal and restoration), and the trap here is that candidates confuse 'powering down' as a valid containment step when it actually destroys forensic evidence and is not recommended in ransomware response.
Detailed technical explanation
How to think about this question
During containment, network isolation can be achieved by disabling the switch port (via SNMP or CLI) or applying a host-based firewall rule to block all inbound/outbound traffic except to a forensic jump box. Eradication involves removing the ransomware binary, registry run keys, and scheduled tasks, then restoring data from verified offline backups (e.g., using VSS or tape backups) to ensure no residual malware is reintroduced. Identifying the initial infection vector through log analysis (e.g., Windows Event ID 4625 for brute-force or 4688 for process creation) helps prevent recurrence by patching the exploited vulnerability.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
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FAQ
Questions learners often ask
What does this CS0-003 question test?
Incident Response and Management — This question tests Incident Response and Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Isolate affected systems from the network immediately. — Isolating affected systems from the network immediately is correct because it stops the ransomware from spreading laterally to other hosts via SMB, RDP, or other network protocols. This containment step is critical to limit the scope of the outbreak and protect unencrypted assets.
What should I do if I get this CS0-003 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This CS0-003 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 CS0-003 exam.
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