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 analyze bandwidth usage by application and identify top talkers on the network. Which protocol or technology should be used to export detailed traffic flow information from routers and switches to a central collector?
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 choice because it is a Cisco-developed protocol designed specifically to export detailed IP traffic flow information—including source/destination IPs, ports, protocols, and byte counts—from routers and switches to a central collector for bandwidth usage analysis and top talker identification. Unlike simpler monitoring tools, NetFlow provides per-flow granularity, enabling administrators to pinpoint which applications and hosts are consuming the most bandwidth.
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.
✓
NetFlow
Why this is correct
NetFlow exports flow records that contain information about each traffic flow, enabling detailed bandwidth and application analysis.
Related concept
Read the scenario before looking for a memorised answer.
✗
SNMP
Why it's wrong here
SNMP provides aggregate interface statistics (e.g., bits per second) but does not provide per-flow detail.
✗
ICMP
Why it's wrong here
ICMP is used for error reporting and diagnostics (e.g., ping), not for traffic analysis.
✗
SMTP
Why it's wrong here
SMTP is used for sending email messages, not for network traffic monitoring.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between SNMP and NetFlow, where candidates mistakenly choose SNMP because they associate it with network monitoring, but SNMP lacks the per-flow granularity needed for top talker and application analysis.
Detailed technical explanation
How to think about this question
NetFlow operates by caching flow records on the network device, where each flow is defined by the 5-tuple (source IP, destination IP, source port, destination port, and protocol). When a flow ends or the cache fills, the device exports these records via UDP (typically port 2055) to a collector, which can then aggregate data for application visibility. A real-world scenario involves using NetFlow v9 or IPFIX (RFC 7011) to detect a sudden spike in traffic to a specific application port, such as a video streaming service overwhelming a WAN link.
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: NetFlow — NetFlow is the correct choice because it is a Cisco-developed protocol designed specifically to export detailed IP traffic flow information—including source/destination IPs, ports, protocols, and byte counts—from routers and switches to a central collector for bandwidth usage analysis and top talker identification. Unlike simpler monitoring tools, NetFlow provides per-flow granularity, enabling administrators to pinpoint which applications and hosts are consuming the most bandwidth.
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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