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200-201 Practice Question: Which three types of data are commonly collected…
Which three types of data are commonly collected and analyzed for network intrusion detection? (Choose three.)
⚠ Common exam trap
Cisco often tests the distinction between network-based and host-based data sources, and the trap here is that candidates may incorrectly include Windows event logs (host-based) or DNS query logs (specialized) as primary network intrusion detection data, when the exam expects the three foundational types: syslog, NetFlow, and full packet captures.
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
✓
Syslog messages
Syslog messages are a standard protocol (RFC 5424) used to forward log messages from network devices, servers, and applications to a central logging server. In intrusion detection, syslog data provides critical event information such as authentication failures, interface status changes, and security policy violations, which analysts correlate with other data sources to identify malicious activity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Syslog messages
Why this is correct
Logs from network devices are critical.
- ✓
NetFlow records
Why this is correct
Standard data for network intrusion detection.
- ✓
Full packet captures
Why this is correct
Provides complete visibility into network traffic.
- ✗
Windows event logs
Why it's wrong here
Host-based logs, not network data.
- ✗
DNS query logs
Why it's wrong here
Useful but not as commonly used as the other three for general intrusion detection.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.