The correct answer is to isolate the host and block the malicious IP or domain at the firewall or proxy. Isolating the workstation immediately cuts off the malware’s communication with its command-and-control server, stopping data exfiltration and lateral movement, while blocking the malicious IP prevents any other compromised host on the network from reaching that same external threat. On the Security+ SY0-701 exam, this tests your understanding of the containment phase from NIST SP 800-61, where the priority is stopping the spread and impact of an incident. A common trap is choosing “disconnect the network cable” instead of “isolate the host”—both sound similar, but isolating is a deliberate, documented action that preserves forensic evidence. Remember the mnemonic “I-Block”: Isolate the host, then Block the IP.
SY0-701 Security Operations Practice Question
This SY0-701 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.
A workstation is suspected of running malware and contacting an unknown host. Which two actions belong in the containment phase? Select two.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Isolate the workstation from the network.
Isolating the workstation from the network (A) immediately stops the malware's ability to communicate with the command-and-control (C2) server, preventing data exfiltration and further propagation. Blocking the malicious IP or domain at the firewall or proxy (B) is a containment action that prevents any system on the network from reaching the known malicious host, even if other hosts are already compromised. Both actions align with the NIST SP 800-61 containment strategy of stopping the spread and impact of an incident.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 the workstation from the network.
Why this is correct
Isolating the workstation stops spread while keeping the system available for analysis.
Related concept
Read the scenario before looking for a memorised answer.
✓
Block the malicious IP or domain at the firewall or proxy.
Why this is correct
Blocking the malicious IP or domain helps cut off command-and-control traffic quickly.
Related concept
Read the scenario before looking for a memorised answer.
✗
Reimage the workstation immediately before collecting evidence.
Why it's wrong here
Reimaging too soon can destroy evidence that may be needed in the investigation.
✗
Tell the user to keep working until tomorrow.
Why it's wrong here
Telling the user to keep working leaves the threat active and exposed.
✗
Delete recent logs to reduce noise.
Why it's wrong here
Deleting logs removes clues and makes later investigation much harder for responders.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the containment phase with the eradication phase, mistakenly thinking that reimaging (Option C) is a containment action when it is actually an eradication step that should only occur after evidence collection and analysis.
Detailed technical explanation
How to think about this question
Network isolation can be achieved by disabling the switch port (using `shutdown` on the interface) or by unplugging the Ethernet cable, which immediately drops all Layer 2 and Layer 3 connectivity. Blocking at the firewall or proxy typically uses DNS sinkholing or IP blacklisting at the perimeter, which prevents any outbound traffic to the malicious host without affecting other legitimate traffic; this is often implemented via ACLs or next-generation firewall rules that inspect application-layer traffic.
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 SOC analyst notices unusual lateral movement in the network at 2 AM. The IR playbook dictates: identify and contain (isolate the affected machine), then eradicate (remove the malware), then recover (restore from backup), then document. Skipping containment before eradication risks the attacker regaining access. Questions like this test the sequence and rationale of incident response phases.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SY0-701 question in full detail.
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: Isolate the workstation from the network. — Isolating the workstation from the network (A) immediately stops the malware's ability to communicate with the command-and-control (C2) server, preventing data exfiltration and further propagation. Blocking the malicious IP or domain at the firewall or proxy (B) is a containment action that prevents any system on the network from reaching the known malicious host, even if other hosts are already compromised. Both actions align with the NIST SP 800-61 containment strategy of stopping the spread and impact of an incident.
What should I do if I get this SY0-701 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This SY0-701 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 SY0-701 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.