- A
Capture a packet trace of the suspicious traffic and analyze the SSL/TLS handshake to determine if the traffic is legitimate.
Deep packet inspection of the encrypted handshake can reveal certificate details or anomalies indicating a covert channel.
- B
Immediately block the destination IP on the firewall and quarantine the server.
Why wrong: Blocking without evidence of malicious content may disrupt legitimate services and does not aid investigation.
- C
Review the server's web server logs for any unusual requests or responses.
Why wrong: Web server logs record incoming HTTP requests, not outbound connections from the server itself; thus likely irrelevant.
- D
Check the server's running processes and network connections with a command line tool like netstat.
Why wrong: Netstat shows active connections but not the encrypted content or handshake details; it is a secondary step.
Quick Answer
The correct next step is to capture a packet trace of the suspicious traffic and analyze the SSL/TLS handshake to determine legitimacy. This is because the traffic is encrypted over TCP port 443, so without inspecting the handshake—specifically the server certificate, cipher suites, and Server Name Indication (SNI)—the analyst cannot confirm whether the external IP is a legitimate service or an unauthorized endpoint used for data exfiltration. On the Cisco CyberOps Associate 200-201 exam, this scenario tests your understanding of encrypted traffic analysis and the limitations of flow-based monitoring tools like Stealthwatch, which can flag volume anomalies but cannot inspect payloads. A common trap is assuming that no Firepower alerts mean the traffic is safe, but encrypted channels often bypass signature-based detection. Remember the mnemonic “CERT-SNI” to recall the key handshake elements to inspect: Certificate, Encryption suite, and Server Name Indication.
200-201 Network Intrusion Analysis Practice Question
This 200-201 practice question tests your understanding of network intrusion analysis. 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.
A security analyst at a financial firm is investigating a potential data breach. The company uses Cisco Firepower NGFW and Stealthwatch for network visibility. Over the past week, an internal server with IP 10.10.10.50 has been sending large amounts of data to an external IP 203.0.113.55 on TCP port 443. The Stealthwatch flow records show that the server typically communicates with only internal hosts and a few known external update servers. The analyst checks the Firepower events and sees no alerts for this traffic. The server is running a custom web application that handles financial transactions. The analyst suspects data exfiltration. What should the analyst do next?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Capture a packet trace of the suspicious traffic and analyze the SSL/TLS handshake to determine if the traffic is legitimate.
Option A is correct because the traffic is encrypted over TCP port 443 (HTTPS), so the analyst cannot determine the content or legitimacy of the data transfer without decrypting or inspecting the SSL/TLS handshake. Capturing a packet trace allows the analyst to examine the TLS handshake details, such as the server certificate, cipher suites, and SNI, which can reveal whether the external IP is a legitimate service or an unauthorized endpoint. This step is non-disruptive and provides forensic evidence before taking any blocking or quarantine actions.
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.
- ✓
Capture a packet trace of the suspicious traffic and analyze the SSL/TLS handshake to determine if the traffic is legitimate.
Why this is correct
Deep packet inspection of the encrypted handshake can reveal certificate details or anomalies indicating a covert channel.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Immediately block the destination IP on the firewall and quarantine the server.
Why it's wrong here
Blocking without evidence of malicious content may disrupt legitimate services and does not aid investigation.
- ✗
Review the server's web server logs for any unusual requests or responses.
Why it's wrong here
Web server logs record incoming HTTP requests, not outbound connections from the server itself; thus likely irrelevant.
- ✗
Check the server's running processes and network connections with a command line tool like netstat.
Why it's wrong here
Netstat shows active connections but not the encrypted content or handshake details; it is a secondary step.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between flow/event data and full packet inspection, trapping candidates who think firewall logs or netstat alone can confirm exfiltration over encrypted channels.
Trap categories for this question
Command / output trap
Netstat shows active connections but not the encrypted content or handshake details; it is a secondary step.
Detailed technical explanation
How to think about this question
Under the hood, Stealthwatch flow records provide metadata (source/destination IP, ports, bytes transferred) but cannot inspect encrypted payloads. A packet capture with tools like tcpdump or Wireshark allows the analyst to examine the TLS handshake's ServerHello certificate and SNI extension, which may indicate a mismatch with the expected external update servers. In real-world scenarios, attackers often use legitimate-looking HTTPS traffic to blend in, so analyzing the certificate chain or using a TLS proxy (e.g., Cisco Firepower's SSL decryption policy) is critical for detection.
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.
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FAQ
Questions learners often ask
What does this 200-201 question test?
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: Capture a packet trace of the suspicious traffic and analyze the SSL/TLS handshake to determine if the traffic is legitimate. — Option A is correct because the traffic is encrypted over TCP port 443 (HTTPS), so the analyst cannot determine the content or legitimacy of the data transfer without decrypting or inspecting the SSL/TLS handshake. Capturing a packet trace allows the analyst to examine the TLS handshake details, such as the server certificate, cipher suites, and SNI, which can reveal whether the external IP is a legitimate service or an unauthorized endpoint. This step is non-disruptive and provides forensic evidence before taking any blocking or quarantine actions.
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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Last reviewed: Jun 25, 2026
This 200-201 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-201 exam.
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