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.
A company uses Cisco Stealthwatch to monitor network traffic. Which type of data does Stealthwatch primarily rely on for visibility?
SNMP traps
Why wrong: SNMP is for device management, not flow analysis.
Full packet captures
Why wrong: Stealthwatch uses NetFlow metadata, not raw packets.
Syslog messages
Why wrong: Syslog is for log events, not network flows.
NetFlow data
Stealthwatch collects and analyzes NetFlow to detect anomalies.
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 data
Cisco Stealthwatch is designed for network traffic analysis and relies on NetFlow data (including IPFIX and other flow protocols) to provide visibility into network behavior, traffic patterns, and anomalies. Unlike full packet captures, NetFlow metadata (source/destination IP, ports, protocols, byte counts) is lightweight and scalable for monitoring large networks, making it the primary data source for Stealthwatch's behavioral analytics and threat detection.
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.
SNMP traps
Why it's wrong here
SNMP is for device management, not flow analysis.
Full packet captures
Why it's wrong here
Stealthwatch uses NetFlow metadata, not raw packets.
Syslog messages
Why it's wrong here
Syslog is for log events, not network flows.
NetFlow data
Why this is correct
Stealthwatch collects and analyzes NetFlow to detect anomalies.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Cisco often tests the distinction between flow-based monitoring (NetFlow) and packet-based monitoring (full packet capture), and the trap here is that candidates mistakenly think full packet captures are required for security monitoring, overlooking that Stealthwatch's efficiency and scalability come from using metadata-rich flow data instead.
Detailed technical explanation
NetFlow, originally a Cisco-proprietary protocol (RFC 3954), exports flow records containing key fields like IP addresses, ports, protocol, and timestamps; Stealthwatch aggregates these flows to build a baseline of normal traffic and detect deviations (e.g., data exfiltration or C2 traffic). In real-world deployments, Stealthwatch can also ingest IPFIX (RFC 7011) and sFlow, but NetFlow remains the core data source for its behavioral analytics engine, which uses machine learning to identify threats without inspecting packet payloads.
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 data — Cisco Stealthwatch is designed for network traffic analysis and relies on NetFlow data (including IPFIX and other flow protocols) to provide visibility into network behavior, traffic patterns, and anomalies. Unlike full packet captures, NetFlow metadata (source/destination IP, ports, protocols, byte counts) is lightweight and scalable for monitoring large networks, making it the primary data source for Stealthwatch's behavioral analytics and threat detection.
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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