This 200-201 practice question tests your understanding of security concepts. 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 security analyst is investigating a potential data exfiltration incident. The analyst notices that a large amount of data has been sent to an external IP address over port 443 during non-business hours. The company uses a proxy server that logs all outbound connections. Which action should the analyst take first to validate the suspicion?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the proxy logs to see the destination IP and user agent string.
Option C is correct because proxy logs contain the destination IP and user agent string, which are critical for validating whether the external IP is legitimate or malicious. By checking these logs first, the analyst can correlate the outbound connection with known threat intelligence or anomalous user agents without disrupting operations or consuming resources on unnecessary packet captures.
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.
✗
Immediately block the external IP address at the firewall.
Why it's wrong here
Blocking without investigation may disrupt legitimate traffic and does not provide evidence.
✗
Run a packet capture on the internal server to analyze the payload.
Why it's wrong here
Packet capture may not be feasible or might miss the traffic if it has already occurred.
✓
Check the proxy logs to see the destination IP and user agent string.
Why this is correct
Proxy logs provide details about the connection and can help identify if the traffic is suspicious.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Notify the security team lead and wait for further instructions.
Why it's wrong here
Waiting may delay investigation and allow further data exfiltration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the candidate's ability to prioritize log analysis over reactive actions, and the trap here is that candidates may jump to blocking the IP (Option A) or escalating (Option D) without first using available logs to validate the suspicion.
Detailed technical explanation
How to think about this question
Proxy servers typically log HTTP headers including the user agent string, which can reveal the client application (e.g., a custom script vs. a browser) and help identify anomalous behavior. Under the hood, the proxy logs also record the destination IP, timestamp, and bytes transferred, allowing the analyst to correlate with threat intelligence feeds or geolocation data. In a real-world scenario, a legitimate cloud service (e.g., AWS S3) might use port 443, but a suspicious user agent like 'curl/7.68.0' during non-business hours could indicate data exfiltration via a script.
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 Concepts — This question tests Security Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Check the proxy logs to see the destination IP and user agent string. — Option C is correct because proxy logs contain the destination IP and user agent string, which are critical for validating whether the external IP is legitimate or malicious. By checking these logs first, the analyst can correlate the outbound connection with known threat intelligence or anomalous user agents without disrupting operations or consuming resources on unnecessary packet captures.
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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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