- A
Syslog
Why wrong: Syslog is used for collecting log messages (events), not for periodic monitoring of interface statistics.
- B
SNMP polling
SNMP polling allows an NMS to query MIB objects like interface utilization counters at regular intervals, making it ideal for real-time bandwidth monitoring.
- C
NetFlow
Why wrong: NetFlow collects traffic flow records (source/destination, ports, etc.) for analysis, but it is not designed for simple, real-time interface utilization polling.
- D
CDP
Why wrong: Cisco Discovery Protocol (CDP) is used to discover directly connected Cisco devices and their capabilities, not for bandwidth monitoring.
Question 479 of 520
SNMP Polling for Real-Time Bandwidth Utilization Monitoring
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 monitor bandwidth utilization on a router interface in real time. Which of the following protocols is best suited for this 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
✓
SNMP polling
SNMP polling is the best choice for real-time bandwidth monitoring because it allows the network management system (NMS) to actively query the router's interface MIB (e.g., ifInOctets, ifOutOctets) at short intervals, calculating utilization from the delta between successive polls. This provides near-real-time data without waiting for unsolicited events, making it ideal for live dashboards and threshold alerts.
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.
- ✗
Syslog
Why it's wrong here
Syslog is used for collecting log messages (events), not for periodic monitoring of interface statistics.
When this WOULD be correct
Syslog would be correct for a question asking about centralized logging of router events, such as interface status changes or security alerts, where real-time bandwidth monitoring is not required.
- ✓
SNMP polling
Why this is correct
SNMP polling allows an NMS to query MIB objects like interface utilization counters at regular intervals, making it ideal for real-time bandwidth monitoring.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
NetFlow
Why it's wrong here
NetFlow collects traffic flow records (source/destination, ports, etc.) for analysis, but it is not designed for simple, real-time interface utilization polling.
When this WOULD be correct
A network administrator needs to analyze traffic patterns and identify top talkers over a period of time. NetFlow would be the best choice for detailed flow-level visibility and historical traffic analysis.
- ✗
CDP
Why it's wrong here
Cisco Discovery Protocol (CDP) is used to discover directly connected Cisco devices and their capabilities, not for bandwidth monitoring.
When this WOULD be correct
A question asking which protocol allows a network administrator to discover directly connected Cisco devices and their device IDs, platform, and IP addresses would make CDP the correct answer.
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.
✓SNMP pollingCorrect answer▾
Why this is correct
SNMP polling allows an NMS to query MIB objects like interface utilization counters at regular intervals, making it ideal for real-time bandwidth monitoring.
✗SyslogWrong answer — click to see why▾
Why this is wrong here
Syslog is used for logging and event messages, not for real-time bandwidth monitoring. It does not provide polling-based utilization data.
★ When this WOULD be the correct answer
Syslog would be correct for a question asking about centralized logging of router events, such as interface status changes or security alerts, where real-time bandwidth monitoring is not required.
Why candidates choose this
Candidates may confuse Syslog as a monitoring tool because it collects logs from network devices, but it lacks the polling mechanism needed for real-time utilization metrics.
✗NetFlowWrong answer — click to see why▾
Why this is wrong here
NetFlow is designed for traffic flow analysis and capacity planning, not real-time bandwidth utilization monitoring on a router interface. It provides aggregated flow data with some delay, whereas SNMP polling offers immediate interface counters.
★ When this WOULD be the correct answer
A network administrator needs to analyze traffic patterns and identify top talkers over a period of time. NetFlow would be the best choice for detailed flow-level visibility and historical traffic analysis.
Why candidates choose this
Candidates may confuse NetFlow's traffic monitoring capabilities with real-time bandwidth monitoring, not realizing that NetFlow focuses on flow data rather than instantaneous interface utilization.
✗CDPWrong answer — click to see why▾
Why this is wrong here
CDP (Cisco Discovery Protocol) is a Layer 2 protocol used to discover directly connected Cisco devices and their capabilities, not for monitoring real-time bandwidth utilization on a router interface.
★ When this WOULD be the correct answer
A question asking which protocol allows a network administrator to discover directly connected Cisco devices and their device IDs, platform, and IP addresses would make CDP the correct answer.
Why candidates choose this
Candidates may confuse CDP with a monitoring protocol because it provides information about neighboring devices, leading them to think it can also report interface statistics like bandwidth usage.
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?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The N10-009 exam often tests SNMP polling vs. NetFlow by framing the question around 'real-time bandwidth utilization,' leading candidates to choose NetFlow because they confuse flow analysis with interface-level utilization, but NetFlow's export delay and flow-based aggregation make it unsuitable for instantaneous per-interface bandwidth monitoring.
Detailed technical explanation
How to think about this question
SNMP polling uses GET requests to retrieve OIDs from the IF-MIB, specifically ifHCInOctets and ifHCOutOctets (64-bit counters) for high-speed interfaces, avoiding counter wrap issues. The NMS calculates utilization using the formula: (delta_octets * 8 * 100) / (delta_time * interface_speed). Real-world deployments often use a polling interval of 30–60 seconds to balance accuracy and network overhead, with tools like PRTG or SolarWinds leveraging this method for live graphs.
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 practitioner preparing for the N10-009 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this N10-009 question test?
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: SNMP polling — SNMP polling is the best choice for real-time bandwidth monitoring because it allows the network management system (NMS) to actively query the router's interface MIB (e.g., ifInOctets, ifOutOctets) at short intervals, calculating utilization from the delta between successive polls. This provides near-real-time data without waiting for unsolicited events, making it ideal for live dashboards and threshold alerts.
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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Last reviewed: Jun 11, 2026
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