Question 352 of 464
N10-009 Network Operations Practice Question
A network administrator needs to identify which application protocols are consuming the most bandwidth on the company WAN link. Which of the following tools should the administrator use?
⚠ Common exam trap
The N10-009 exam often tests the distinction between flow-based monitoring (NetFlow) and packet-level analysis (sniffers), trapping candidates who think a packet sniffer is the best tool for long-term bandwidth usage by application, when in fact it is too resource-intensive and lacks built-in aggregation for that purpose.
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
✓
NetFlow analyzer
A NetFlow analyzer is the correct tool because it collects flow-level metadata (e.g., source/destination IPs, ports, protocol, and byte counts) from routers or switches, enabling the administrator to identify which application protocols (via port/protocol analysis) are consuming the most bandwidth over time. Unlike packet-level tools, NetFlow provides aggregated traffic statistics without storing full packet payloads, making it efficient for long-term WAN bandwidth monitoring.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
NetFlow analyzer
Why this is correct
NetFlow (and similar technologies like sFlow or IPFIX) captures metadata about network conversations, known as "flows." Each flow record includes source/destination IP addresses, ports, protocols, and byte/packet counts. An analyzer aggregates these records to provide detailed insights into which specific applications (identified by port/protocol) are generating the most traffic, making it ideal for identifying top bandwidth consumers and their usage patterns.
- ✗
Packet sniffer (e.g., tcpdump)
Why it's wrong here
A packet sniffer captures raw network traffic, providing granular detail down to the payload of individual packets. While it can technically reveal application protocols and their data volume, analyzing this raw, unaggregated data for long-term, high-volume bandwidth consumption across all applications is computationally intensive and impractical. It lacks the built-in aggregation and reporting capabilities of flow-based systems for high-level usage trends.
When this WOULD be correct
When the question asks for a tool to capture and analyze the contents of individual packets for troubleshooting a specific application issue, such as verifying encryption or decoding application-layer data.
- ✗
Port scanner (e.g., Nmap)
Why it's wrong here
A port scanner like Nmap is designed to probe a target host or network to discover which ports are open and listening for connections. Its primary function is security auditing and network mapping, identifying potential vulnerabilities or available services. It generates its own traffic to test port status and provides no data on the ongoing bandwidth consumption by existing application protocols or their overall usage.
When this WOULD be correct
A network administrator needs to identify which services are running on a server to assess potential security vulnerabilities. In that scenario, a port scanner like Nmap would be the correct tool.
- ✗
Bandwidth speed test
Why it's wrong here
A bandwidth speed test measures the maximum data transfer rate (upload and download throughput) between a client and a test server over a short, specific period. It provides a single aggregate number for the link's current capacity or performance, often used to verify ISP speeds. This tool cannot differentiate or break down bandwidth usage by individual application protocols, making it unsuitable for identifying specific application consumers.
When this WOULD be correct
When the question asks to measure the maximum throughput or latency of the WAN link to an external endpoint, such as verifying ISP performance or troubleshooting slow internet speeds.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The N10-009 exam frequently reuses these exact scenarios with slightly different constraints.
✓NetFlow analyzerCorrect answer▾
Why this is correct
NetFlow (and similar technologies like sFlow or IPFIX) captures metadata about network conversations, known as "flows." Each flow record includes source/destination IP addresses, ports, protocols, and byte/packet counts. An analyzer aggregates these records to provide detailed insights into which specific applications (identified by port/protocol) are generating the most traffic, making it ideal for identifying top bandwidth consumers and their usage patterns.
✗Packet sniffer (e.g., tcpdump)Wrong answer — click to see why▾
Why this is wrong here
A packet sniffer captures raw packets for deep inspection but does not aggregate bandwidth usage by application protocol; it requires manual analysis and lacks built-in reporting for top talkers or protocol distribution over time.
★ When this WOULD be the correct answer
When the question asks for a tool to capture and analyze the contents of individual packets for troubleshooting a specific application issue, such as verifying encryption or decoding application-layer data.
Why candidates choose this
Candidates may think packet sniffers can measure bandwidth by protocol since they see packet sizes and protocols, but they overlook the need for aggregated, historical bandwidth reporting that NetFlow provides.
✗Port scanner (e.g., Nmap)Wrong answer — click to see why▾
Why this is wrong here
A port scanner like Nmap identifies open ports and services on hosts, but it does not measure bandwidth consumption by application protocols. It cannot show which protocols are using the most bandwidth over time.
★ When this WOULD be the correct answer
A network administrator needs to identify which services are running on a server to assess potential security vulnerabilities. In that scenario, a port scanner like Nmap would be the correct tool.
Why candidates choose this
Candidates may confuse the ability to discover running services (which Nmap does) with the ability to measure bandwidth usage by those services, assuming that knowing which services are present implies knowing their bandwidth consumption.
✗Bandwidth speed testWrong answer — click to see why▾
Why this is wrong here
A bandwidth speed test measures throughput to an external server, not per-application protocol usage on the WAN link, so it cannot identify which application protocols are consuming bandwidth.
★ When this WOULD be the correct answer
When the question asks to measure the maximum throughput or latency of the WAN link to an external endpoint, such as verifying ISP performance or troubleshooting slow internet speeds.
Why candidates choose this
Candidates may confuse bandwidth measurement with application protocol analysis, thinking a speed test can show which applications are using the link.
Analysis generated from the official N10-009blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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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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