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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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.
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.
✓
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.
Clue confirmation
The clue word "best" in the question point toward this answer.
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.
✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco 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.
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: 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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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