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Quick Answer
The correct containment phase actions for a malware outbreak are isolating affected systems, blocking outbound communication at the firewall, and implementing network segmentation to prevent lateral movement. These three steps directly stop the malware from communicating with command-and-control servers, exfiltrating data, or spreading to other hosts, which is the core goal of containment. On the CompTIA CySA+ CS0-003 exam, this question tests your ability to distinguish containment from eradication or recovery—a common trap is selecting “scanning for rootkits” or “patching vulnerabilities,” which belong to later phases. Remember the memory tip: “Isolate, Block, Segment” to lock down the outbreak.
CS0-003 Security Operations Practice Question
This CS0-003 practice question tests your understanding of security operations. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 incident response team is analyzing a suspected malware outbreak on a corporate network. Which three of the following actions should be performed as part of the containment phase? (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
✓
Isolating affected systems from the network by disabling their network interfaces.
Isolating affected systems from the network by disabling their network interfaces is a core containment action because it immediately stops the malware from communicating with command-and-control (C2) servers or spreading to other hosts. Blocking outbound communication from infected hosts at the firewall prevents data exfiltration and further C2 activity without requiring physical access to each machine. Implementing network segmentation (e.g., VLANs or ACLs) restricts lateral movement by limiting the infected system's ability to reach other subnets, which is critical in containing a worm or ransomware outbreak.
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 actions (immediate isolation) and eradication actions (patching, imaging), so candidates mistakenly select 'creating a forensic image' or 'patching the vulnerability' as containment steps when they actually belong to later phases of the incident response process.
Detailed technical explanation
How to think about this question
During containment, disabling the network interface (e.g., via `ifconfig down` or `netsh interface set interface admin=disable`) stops all Layer 2/3 traffic instantly, while firewall ACLs can block specific ports (e.g., TCP 445 for SMB or TCP 3389 for RDP) used by malware for lateral movement. Network segmentation using VLANs or micro-segmentation policies (e.g., with 802.1X or SDN) enforces zero-trust boundaries, preventing ARP spoofing or SMB relay attacks from spreading across broadcast domains. In a real-world ransomware scenario like WannaCry, failing to block outbound SMB traffic allowed the worm to propagate globally within minutes.
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 security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
What to study next
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FAQ
Questions learners often ask
What does this CS0-003 question test?
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Isolating affected systems from the network by disabling their network interfaces. — Isolating affected systems from the network by disabling their network interfaces is a core containment action because it immediately stops the malware from communicating with command-and-control (C2) servers or spreading to other hosts. Blocking outbound communication from infected hosts at the firewall prevents data exfiltration and further C2 activity without requiring physical access to each machine. Implementing network segmentation (e.g., VLANs or ACLs) restricts lateral movement by limiting the infected system's ability to reach other subnets, which is critical in containing a worm or ransomware outbreak.
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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