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.
An NOC technician observes that the average latency on a critical WAN link has risen sharply. To determine which applications are consuming the most bandwidth and contributing to the latency, which tool should the technician use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A) NetFlow
NetFlow is the correct tool because it provides per-flow traffic analysis, allowing the technician to identify which applications (by protocol and port) are consuming the most bandwidth on the WAN link. Unlike simple bandwidth monitors, NetFlow exports detailed records of source/destination IPs, ports, and byte counts, enabling precise identification of bandwidth-hungry applications contributing to increased latency.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
A) NetFlow
Why this is correct
Correct. NetFlow captures traffic flows and allows analysis of bandwidth usage by application, source, and destination.
Related concept
Read the scenario before looking for a memorised answer.
✗
B) SNMP
Why it's wrong here
SNMP polls device counters (e.g., interface bytes) but does not reveal which applications are using the bandwidth.
✗
C) Syslog
Why it's wrong here
Syslog is used for log messages and events, not for traffic analysis.
✗
D) Ping
Why it's wrong here
Ping tests reachability and latency but does not provide per-application bandwidth data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between SNMP (which shows aggregate bandwidth) and NetFlow (which shows per-application bandwidth), leading candidates to mistakenly choose SNMP because they associate it with bandwidth monitoring, even though it cannot identify specific applications.
Detailed technical explanation
How to think about this question
NetFlow (defined in RFC 3954) operates by caching flow records on the router, where a flow is defined by the 5-tuple (source IP, destination IP, source port, destination port, protocol). The router exports these records to a collector (e.g., SolarWinds, PRTG) for analysis. In a real-world scenario, a sudden latency spike on a WAN link might be caused by a backup application saturating the link; NetFlow would immediately show high byte counts for that application's port (e.g., TCP 445 for SMB), while SNMP would only show the interface utilization without application context.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this N10-009 question in full detail.
Network Operations — This question tests Network Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A) NetFlow — NetFlow is the correct tool because it provides per-flow traffic analysis, allowing the technician to identify which applications (by protocol and port) are consuming the most bandwidth on the WAN link. Unlike simple bandwidth monitors, NetFlow exports detailed records of source/destination IPs, ports, and byte counts, enabling precise identification of bandwidth-hungry applications contributing to increased latency.
What should I do if I get this N10-009 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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