Quick Answer
The answer is NetFlow, as it is the only technology that provides the detailed flow data required for WAN traffic analysis, including source and destination IP addresses, ports, and protocols. Unlike SNMP, which offers aggregate bandwidth utilization, or Syslog, which logs events, NetFlow captures metadata about every conversation between devices, allowing an administrator to pinpoint exactly which hosts are consuming the most bandwidth on a WAN link. On the CompTIA Network+ N10-009 exam, this question tests your ability to distinguish between monitoring tools: SNMP is for overall interface stats, Syslog is for log messages, and NetFlow is for per-flow visibility. A common trap is choosing SNMP because it measures bandwidth, but it lacks the granularity of flow data. Remember the memory tip: “NetFlow tells you who is talking to whom, on which port, and how much they’re saying.”
This N10-009 practice question tests your understanding of network operations. 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 network administrator needs to identify which devices are generating the most traffic on a WAN link. The administrator requires detailed flow data including source and destination IP addresses, ports, and protocols. Which technology should be deployed?
SNMP polling
Why wrong: SNMP polls interface counters (bytes/packets) but does not provide per-flow details.
NetFlow
NetFlow records contain flow attributes like IP addresses, ports, and protocol, ideal for traffic analysis.
Syslog
Why wrong: Syslog is for log messages, not for traffic flow data.
ICMP
Why wrong: ICMP is used for diagnostic purposes (ping, traceroute), not for collecting flow statistics.
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
NetFlow is the correct technology because it provides detailed flow-level data, including source and destination IP addresses, ports, and protocols, which is exactly what the administrator needs to identify which devices are generating the most traffic on a WAN link. Unlike SNMP or Syslog, NetFlow exports metadata about network flows, allowing for granular traffic analysis and bandwidth usage per conversation.
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 polling
Why it's wrong here
SNMP polls interface counters (bytes/packets) but does not provide per-flow details.
NetFlow
Why this is correct
NetFlow records contain flow attributes like IP addresses, ports, and protocol, ideal for traffic analysis.
Related concept
Read the scenario before looking for a memorised answer.
Syslog
Why it's wrong here
Syslog is for log messages, not for traffic flow data.
ICMP
Why it's wrong here
ICMP is used for diagnostic purposes (ping, traceroute), not for collecting flow statistics.
Common exam traps
The trap here is that candidates often confuse SNMP's interface utilization data with the detailed per-flow information that only NetFlow provides, leading them to choose SNMP polling when the question explicitly asks for source/destination IPs, ports, and protocols.
Detailed technical explanation
NetFlow operates by caching flow records on the router or switch, where each flow is defined by the 5-tuple (source IP, destination IP, source port, destination port, protocol). The device exports these records to a collector using UDP (typically port 2055 or 9996), enabling analysis of traffic patterns, top talkers, and application usage. In real-world scenarios, NetFlow is essential for capacity planning and security investigations, as it can reveal which hosts are consuming the most bandwidth or communicating with suspicious external IPs.
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
Network Operations — This question tests Network Operations — Read the scenario before looking for a memorised answer..
The correct answer is: NetFlow — NetFlow is the correct technology because it provides detailed flow-level data, including source and destination IP addresses, ports, and protocols, which is exactly what the administrator needs to identify which devices are generating the most traffic on a WAN link. Unlike SNMP or Syslog, NetFlow exports metadata about network flows, allowing for granular traffic analysis and bandwidth usage per conversation.
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 11, 2026
This N10-009 practice question is part of Courseiva's free CompTIA 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 N10-009 exam.
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