Quick Answer
The answer is network logs and full packet captures. Network logs are a primary source of evidence in network forensics because they record events such as authentication attempts, firewall actions, and system access, providing a chronological trail of activity that can be correlated with other data to reconstruct an incident. Full packet captures, on the other hand, preserve the complete raw data of network traffic, including payloads and headers, allowing for deep inspection of protocol anomalies and malicious content that logs alone might miss. On the Cisco CyberOps Associate 200-201 exam, this distinction tests your understanding of the two fundamental data types used in network forensics: logs for event context and packet captures for granular evidence. A common trap is confusing session data (which summarizes flows) with full packet captures, or assuming logs contain payload details. Remember the memory tip: “Logs tell you what happened; packets show you exactly how it happened.”
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 types of data are commonly used for network forensics? (Choose two.)
Application code
Why wrong: Application code is host-level, not network.
Hard drive images
Why wrong: Hard drive images are for host forensics.
NetFlow records
Why wrong: NetFlow provides flow data but not full detail; less common for forensics.
Full packet captures
Why wrong: PCAPs are crucial for network forensics.
Network logs
Network logs capture events and are key for forensic analysis.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Network logs
Network logs (E) are a primary source of evidence in network forensics because they record events such as authentication attempts, firewall actions, and system access. These logs provide a chronological trail of activity that can be correlated with other data to reconstruct an incident. They are commonly used due to their availability and the critical context they offer for identifying malicious behavior.
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.
Application code
Why it's wrong here
Application code is host-level, not network.
Hard drive images
Why it's wrong here
Hard drive images are for host forensics.
NetFlow records
Why it's wrong here
NetFlow provides flow data but not full detail; less common for forensics.
Full packet captures
Why it's wrong here
PCAPs are crucial for network forensics.
Network logs
Why this is correct
Network logs capture events and are key for forensic analysis.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Cisco often tests the distinction between metadata-only sources (like NetFlow) and full-content sources (like packet captures and logs), leading candidates to incorrectly select NetFlow as a primary forensic data type when the question requires evidence with payload or detailed event context.
Detailed technical explanation
Network logs typically come from syslog, Windows Event Log, or firewall logs (e.g., iptables logs) and often include timestamps, source/destination IPs, and action taken. In a real-world incident, correlating network logs with full packet captures (PCAP) allows an analyst to verify that a specific log entry (e.g., 'connection denied') matches the actual packet exchange, revealing attempts to bypass ACLs. Tools like Wireshark or tcpdump capture full packets, while NetFlow (using Cisco's NetFlow v9 or IPFIX) only exports flow summaries, missing payload content crucial for identifying exploit payloads.
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
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FAQ
Network Intrusion Analysis — This question tests Network Intrusion Analysis — Read the scenario before looking for a memorised answer..
The correct answer is: Network logs — Network logs (E) are a primary source of evidence in network forensics because they record events such as authentication attempts, firewall actions, and system access. These logs provide a chronological trail of activity that can be correlated with other data to reconstruct an incident. They are commonly used due to their availability and the critical context they offer for identifying malicious behavior.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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