This 200-201 practice question tests your understanding of security monitoring. 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 are common sources of security event data in a Security Information and Event Management (SIEM) system?
SMTP logs
Why wrong: SMTP logs are specific to email and less common as a primary SIEM source.
NetFlow records
NetFlow provides metadata on network traffic flows.
SNMP traps
Why wrong: SNMP traps are more for network performance monitoring than security events.
Syslog from network devices
Syslog is a standard for sending event messages to SIEM.
DNS queries
Why wrong: DNS logs can be security-relevant but are not a primary SIEM source.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
NetFlow records
NetFlow records (B) are a common source of security event data in a SIEM because they provide detailed metadata about network flows, including source/destination IPs, ports, protocols, and byte counts. SIEMs ingest NetFlow to detect anomalies, such as data exfiltration or beaconing, by analyzing flow patterns rather than full packet payloads. This makes NetFlow a standard telemetry source for network visibility and threat hunting.
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.
SMTP logs
Why it's wrong here
SMTP logs are specific to email and less common as a primary SIEM source.
NetFlow records
Why this is correct
NetFlow provides metadata on network traffic flows.
Related concept
Read the scenario before looking for a memorised answer.
SNMP traps
Why it's wrong here
SNMP traps are more for network performance monitoring than security events.
Syslog from network devices
Why this is correct
Syslog is a standard for sending event messages to SIEM.
Related concept
Read the scenario before looking for a memorised answer.
DNS queries
Why it's wrong here
DNS logs can be security-relevant but are not a primary SIEM source.
Common exam traps
Cisco often tests the distinction between network management protocols (SNMP) and security monitoring sources (syslog, NetFlow), leading candidates to mistakenly select SNMP traps as a security event source because they associate 'traps' with alerts, when in fact SNMP is for device health, not security event logging.
Detailed technical explanation
Syslog (D) is a standard logging protocol (RFC 5424) used by network devices to send event messages (e.g., authentication failures, configuration changes) to a SIEM, often over UDP port 514. NetFlow (B) exports flow records using UDP (typically port 2055 or 9996) and can be versioned (e.g., NetFlow v5, v9, or IPFIX); SIEMs correlate these with other logs to build a timeline of network activity. In a real-world scenario, a SIEM might combine syslog from a firewall (e.g., 'deny' events) with NetFlow to confirm whether a blocked connection actually attempted data transfer.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Security Monitoring — This question tests Security Monitoring — Read the scenario before looking for a memorised answer..
The correct answer is: NetFlow records — NetFlow records (B) are a common source of security event data in a SIEM because they provide detailed metadata about network flows, including source/destination IPs, ports, protocols, and byte counts. SIEMs ingest NetFlow to detect anomalies, such as data exfiltration or beaconing, by analyzing flow patterns rather than full packet payloads. This makes NetFlow a standard telemetry source for network visibility and threat hunting.
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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