Quick Answer
The answer is to isolate the server from the network and escalate to incident response. This is the correct first step because the irregular timing of outbound connections to a known command-and-control domain on port 443 is a classic sign of a compromised host using HTTPS to blend in with normal traffic, and isolating the server immediately prevents further data exfiltration or lateral movement while preserving forensic evidence. On the Cisco CyberOps Associate 200-201 exam, this scenario tests your ability to prioritize containment over analysis in the NIST incident response framework, with a common trap being analysts who try to inspect the traffic first or block the domain at the firewall, which risks alerting the attacker. Remember the memory tip: “Isolate before you investigate” to keep the host from communicating with the C2 server.
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 is reviewing a firewall log and sees a large number of outbound connections from an internal server to a known command-and-control (C2) domain. The connections are on port 443, and the packets have irregular timing. 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.
Isolate the server from the network and escalate to incident response.
Containment first.
Check the server's logs for signs of compromise.
Why wrong: Check after containment?
Ignore the alert because port 443 is normal traffic.
Why wrong: C2 traffic can use port 443.
Block the domain at the firewall immediately.
Why wrong: Blocking is good but isolation is more immediate.
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 server from the network and escalate to incident response.
The irregular timing and outbound connections to a known C2 domain on port 443 strongly indicate a compromised host using HTTPS to blend in with normal traffic. Isolating the server first prevents further data exfiltration or lateral movement while preserving forensic evidence, which aligns with the NIST incident response framework. Escalating to incident response ensures proper handling and analysis.
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.
Isolate the server from the network and escalate to incident response.
Why this is correct
Containment first.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Check the server's logs for signs of compromise.
Why it's wrong here
Check after containment?
Ignore the alert because port 443 is normal traffic.
Why it's wrong here
C2 traffic can use port 443.
Block the domain at the firewall immediately.
Why it's wrong here
Blocking is good but isolation is more immediate.
Common exam traps
Cisco often tests the principle of containment before investigation, where candidates mistakenly choose to investigate logs first instead of isolating the compromised host to prevent further damage.
Detailed technical explanation
C2 traffic on port 443 often uses TLS encryption to evade detection, but behavioral anomalies like irregular packet timing (e.g., jitter or periodic bursts) can distinguish it from legitimate HTTPS. Tools like Zeek or Suricata can analyze TLS handshake metadata (e.g., JA3 fingerprints) to identify known C2 patterns. In real-world scenarios, delaying isolation can allow ransomware to encrypt files or credentials to be stolen via alternate channels.
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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 server from the network and escalate to incident response. — The irregular timing and outbound connections to a known C2 domain on port 443 strongly indicate a compromised host using HTTPS to blend in with normal traffic. Isolating the server first prevents further data exfiltration or lateral movement while preserving forensic evidence, which aligns with the NIST incident response framework. Escalating to incident response ensures proper handling and analysis.
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 25, 2026
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