The answer is to isolate the workstation from the network and perform a forensic analysis. This is the correct next step because the Snort NIDS alert for a fake SSL certificate MITM detection, combined with a self-signed certificate impersonating google.com from an unknown IP, is a strong indicator of compromise—regardless of the user’s report of normal behavior. In a real-world SOC, the priority is containment and evidence preservation to prevent lateral movement or data exfiltration. On the Cisco CyberOps Associate 200-201 exam, this scenario tests your understanding of incident response procedures and how to prioritize actions when network-based and host-based indicators conflict. A common trap is to trust user reports or focus on the web proxy logs instead of acting on the clear NIDS signature. Remember the mnemonic: “Alert, Isolate, Analyze”—when a certificate is fake and the IP is unknown, containment comes first.
200-201 Security Monitoring Practice Question
This 200-201 practice question tests your understanding of security monitoring. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
You are a cybersecurity analyst in a SOC. The company uses a combination of Snort NIDS and Windows Event Log monitoring. At 3:00 PM, you receive a critical alert: 'ET TROJAN Observed Malicious SSL Certificate (Fake Google)'. The alert shows that a workstation (IP 10.0.1.45) initiated an SSL connection to IP 192.0.2.10 on port 443. The certificate presented by the server is self-signed and claims to be 'google.com'. The destination IP is not in any known Google IP range. You check the firewall logs and see that the outbound connection was allowed. The workstation's host logs show that the user is a marketing employee who frequently accesses webmail. The user reports no unusual behavior. You also check the company's web proxy logs and see that the user accessed 'http://www.google.com' earlier today, but the SSL connection is to a different IP. What should be your next step?
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 and perform a forensic analysis
The alert indicates a potential man-in-the-middle (MITM) attack or malware using a self-signed SSL certificate impersonating google.com. Isolating the workstation is critical to prevent lateral movement or data exfiltration while preserving evidence for forensic analysis. The combination of Snort NIDS detecting the malicious certificate and the connection to an unknown IP (192.0.2.10) strongly suggests compromise, regardless of user reports.
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.
✗
Ignore the alert because the user is unaware of any issue
Why it's wrong here
The user may not be aware of malware; the technical indicators are strong evidence of compromise.
✓
Isolate the workstation from the network and perform a forensic analysis
Why this is correct
Isolating the workstation prevents further damage, and forensic analysis can determine the root cause and scope of compromise.
Related concept
Read the scenario before looking for a memorised answer.
✗
Wait and monitor the workstation for further alerts before taking action
Why it's wrong here
Delaying action could allow the attacker to steal data or move laterally.
✗
Block the destination IP 192.0.2.10 on the firewall
Why it's wrong here
Blocking the IP is a temporary measure, but the workstation may already be compromised; isolation is more comprehensive.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the principle that user reports of 'no unusual behavior' are unreliable in incident response, and that immediate containment (isolation) takes precedence over monitoring or partial blocking.
Detailed technical explanation
How to think about this question
Snort's 'ET TROJAN Observed Malicious SSL Certificate (Fake Google)' rule detects self-signed certificates that claim to be google.com but are not signed by a trusted CA. In a real-world scenario, such certificates are often used by malware (e.g., Zbot or Dridex) to intercept HTTPS traffic via local proxy or by an on-path attacker. Forensic analysis should include memory capture, disk imaging, and checking for rogue certificate authorities installed on the host.
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 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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security Monitoring — This question tests Security Monitoring — 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 and perform a forensic analysis — The alert indicates a potential man-in-the-middle (MITM) attack or malware using a self-signed SSL certificate impersonating google.com. Isolating the workstation is critical to prevent lateral movement or data exfiltration while preserving evidence for forensic analysis. The combination of Snort NIDS detecting the malicious certificate and the connection to an unknown IP (192.0.2.10) strongly suggests compromise, regardless of user reports.
What should I do if I get this 200-201 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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Question Discussion
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