This 200-201 practice question tests your understanding of security monitoring. 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 SOC analyst receives an alert for 'Malware Detected' from an endpoint sensor. The analyst checks the endpoint and sees a file named 'invoice.exe' in the Downloads folder. What should the analyst do first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Escalate to a senior analyst.
Why wrong: Should contain first before escalation.
Run a full antivirus scan.
Why wrong: Time-consuming; malware may block scan.
Isolate the host from the network.
Contains the threat and prevents spread.
Delete the file immediately.
Why wrong: Destroys evidence and does not address running process.
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 the host from the network.
The correct first step is to isolate the host from the network (C) because the alert indicates active malware ('invoice.exe' in Downloads). Containment is the immediate priority in incident response to prevent lateral movement and data exfiltration. Isolating the host stops any ongoing C2 communication or propagation over the network, aligning with the NIST SP 800-61 containment strategy.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Escalate to a senior analyst.
Why it's wrong here
Should contain first before escalation.
Run a full antivirus scan.
Why it's wrong here
Time-consuming; malware may block scan.
Isolate the host from the network.
Why this is correct
Contains the threat and prevents spread.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Delete the file immediately.
Why it's wrong here
Destroys evidence and does not address running process.
Common exam traps
Cisco often tests the incident response priority of containment over eradication or escalation, and the trap here is that candidates may choose to delete the file (D) or run a scan (B) first, mistaking remediation for the initial response step.
Detailed technical explanation
Isolation can be achieved by disabling the network interface (e.g., via `ip link set eth0 down` on Linux or disabling the adapter in Windows) or by using endpoint detection and response (EDR) tools to quarantine the host. This action stops all TCP/UDP traffic, including DNS queries that might be used for C2 beaconing. In a real-world scenario, failing to isolate first could allow ransomware to encrypt network shares or exfiltrate data via SMB or HTTP.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 200-201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Security Monitoring — This question tests Security Monitoring — Read the scenario before looking for a memorised answer..
The correct answer is: Isolate the host from the network. — The correct first step is to isolate the host from the network (C) because the alert indicates active malware ('invoice.exe' in Downloads). Containment is the immediate priority in incident response to prevent lateral movement and data exfiltration. Isolating the host stops any ongoing C2 communication or propagation over the network, aligning with the NIST SP 800-61 containment strategy.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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