The answer is encrypted traffic using unrecognized SSL certificates and communication with a known malicious IP address. These are strong indicators of compromise in network traffic because they directly reveal anomalous behavior: unrecognized SSL certificates often indicate a man-in-the-middle attack or a malware implant using self-signed certs to hide C2 traffic, while traffic to a known malicious IP suggests the host is actively communicating with a command-and-control server or malware distribution point. On the Cisco CyberOps Associate 200-201 exam, this concept tests your ability to distinguish high-fidelity IOCs from noise—threat intelligence feeds like AlienVault OTX or MISP provide curated blocklists that make IP matches a definitive red flag. A common trap is mistaking generic encrypted traffic (e.g., HTTPS to a legitimate site) for an IOC; the key is the certificate’s unrecognized status or the IP’s reputation. Memory tip: “Bad cert, bad IP—two IOCs you can’t skip.”
200-201 Network Intrusion Analysis Practice Question
This 200-201 practice question tests your understanding of network intrusion analysis. 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.
Which two pieces of evidence are strong indicators of compromise (IOC) in network traffic?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Communication with a known malicious IP address
Communication with a known malicious IP address is a strong indicator of compromise because it directly suggests the host is interacting with a command-and-control (C2) server or a malware distribution point. Threat intelligence feeds and blocklists (e.g., AlienVault OTX, MISP) provide curated lists of known malicious IPs; matching traffic to these lists provides high-fidelity evidence of an active compromise.
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.
Read the scenario before looking for a memorised answer.
✓
Encrypted traffic using unrecognized SSL certificates
Why this is correct
Unrecognized certificates may indicate man-in-the-middle or malicious servers.
Related concept
Read the scenario before looking for a memorised answer.
✗
Regular DNS queries to corporate DNS servers
Why it's wrong here
This is normal network behavior.
✗
Normal SMTP traffic to internal mail server
Why it's wrong here
Internal email traffic is benign.
✗
Standard HTTP traffic to a known content delivery network
Why it's wrong here
CDN traffic is normal and expected.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between 'normal' traffic and 'anomalous' traffic, and the trap here is that candidates may mistake encrypted traffic (Option B) as always suspicious, but the question asks for 'strong indicators' — and unrecognized SSL certificates are indeed a strong IOC, while regular DNS, SMTP, and CDN traffic are not.
Detailed technical explanation
How to think about this question
Encrypted traffic using unrecognized SSL certificates (Option B) is a strong IOC because it may indicate a man-in-the-middle attack, a rogue certificate authority, or malware using self-signed certificates to evade inspection. Under the hood, tools like Zeek can extract certificate hashes and compare them against known certificate transparency logs; a mismatch or an untrusted issuer often correlates with malicious activity. In real-world scenarios, ransomware like Ryuk has used self-signed certificates for its C2 communications, making this a critical behavioral indicator.
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 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
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.
Network Intrusion Analysis — This question tests Network Intrusion Analysis — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Communication with a known malicious IP address — Communication with a known malicious IP address is a strong indicator of compromise because it directly suggests the host is interacting with a command-and-control (C2) server or a malware distribution point. Threat intelligence feeds and blocklists (e.g., AlienVault OTX, MISP) provide curated lists of known malicious IPs; matching traffic to these lists provides high-fidelity evidence of an active compromise.
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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