The answer is to enable SSL decryption on the firewall to inspect the traffic content. This is correct because the gradual increase in outbound traffic on port 443 to foreign IPs during non-business hours, with no IDS alerts or suspicious processes, is a classic sign of data exfiltration over encrypted channels. Since HTTPS traffic is encrypted, the IDS cannot see the payload, and endpoint checks may miss malware that piggybacks on legitimate system processes. On the Cisco CyberOps Associate 200-201 exam, this scenario tests your understanding of how encryption can blind security tools and why SSL decryption is a critical countermeasure for detecting encrypted exfiltration. A common trap is assuming that no IDS alert means no threat, but encrypted traffic can bypass signature-based detection entirely. Memory tip: “No alert on port 443? Decrypt to see the hurt.”
200-201 Security Monitoring Practice Question
This 200-201 practice question tests your understanding of security monitoring. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 SOC analyst at a mid-sized company. The company uses a SIEM that ingests logs from firewalls, IDS, and endpoints. Over the past week, you've noticed a gradual increase in outbound traffic from several internal hosts to IP addresses in a foreign country during non-business hours. The traffic is primarily on port 443. The IDS has not generated any alerts. The firewall logs show the connections are established. You check the endpoints and find no unusual processes running. However, the outbound connections persist. What is the most likely explanation and the best next step?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable SSL decryption on the firewall to inspect the traffic content.
The gradual increase in outbound traffic on port 443 (HTTPS) to foreign IPs during non-business hours, without IDS alerts or suspicious processes, strongly suggests data exfiltration over encrypted channels. Since the traffic is encrypted, the IDS cannot inspect the payload, and endpoint checks may miss stealthy malware that uses legitimate processes (e.g., svchost.exe) for beaconing. Enabling SSL decryption on the firewall allows the SOC to decrypt and inspect the HTTPS traffic, revealing the actual content and confirming or ruling out exfiltration.
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.
✓
Enable SSL decryption on the firewall to inspect the traffic content.
Why this is correct
Provides visibility into encrypted traffic to confirm data exfiltration.
Clue confirmation
The clue words "best", "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Assume the hosts are compromised and reimage them.
Why it's wrong here
No evidence of compromise on endpoints; reimaging is drastic.
✗
Ignore the traffic since the IDS and endpoints show no signs of compromise.
Why it's wrong here
Complacent; unusual outbound traffic should be investigated.
✗
Immediately isolate all affected hosts from the network.
Why it's wrong here
Premature; may disrupt business without confirming malicious activity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a lack of IDS alerts and endpoint anomalies means the network is clean, but the trap here is that encrypted traffic (port 443) can hide malicious activity from signature-based detection, requiring proactive decryption to uncover the threat.
Detailed technical explanation
How to think about this question
SSL/TLS inspection (decryption) typically uses a man-in-the-middle proxy on the firewall that re-encrypts traffic with a trusted certificate, allowing deep packet inspection of HTTPS payloads. In a real-world scenario, advanced persistent threats (APTs) often use HTTPS beaconing to blend in with normal web traffic, and without decryption, the SOC is blind to the actual data being sent. The gradual increase in traffic volume is a classic indicator of data staging and exfiltration, where attackers slowly move data to avoid triggering volume-based alerts.
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: Enable SSL decryption on the firewall to inspect the traffic content. — The gradual increase in outbound traffic on port 443 (HTTPS) to foreign IPs during non-business hours, without IDS alerts or suspicious processes, strongly suggests data exfiltration over encrypted channels. Since the traffic is encrypted, the IDS cannot inspect the payload, and endpoint checks may miss stealthy malware that uses legitimate processes (e.g., svchost.exe) for beaconing. Enabling SSL decryption on the firewall allows the SOC to decrypt and inspect the HTTPS traffic, revealing the actual content and confirming or ruling out exfiltration.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best", "most likely". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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