N10-009 Network Operations Practice Question
A network administrator wants to centrally monitor the bandwidth utilization on a router's serial interface over time. The monitoring tool needs to periodically poll the router for current interface counters. Which protocol should be used for this polling?
⚠ Common exam trap
The N10-009 exam often tests the distinction between polling (SNMP) and push-based reporting (Syslog, NetFlow), and the trap here is that candidates confuse NetFlow's flow export capability with simple interface counter polling, or assume Syslog can be used for periodic data retrieval.
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
SNMP (Simple Network Management Protocol) is the correct choice because it is specifically designed for polling network devices to retrieve operational statistics such as interface counters (e.g., ifInOctets, ifOutOctets) from a Management Information Base (MIB). The network administrator can configure an SNMP manager to periodically poll the router's serial interface OIDs, enabling centralized bandwidth utilization monitoring over time.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
SNMP
Why this is correct
SNMP (Simple Network Management Protocol) is the industry-standard protocol for managing and monitoring network devices. It utilizes Management Information Bases (MIBs) to organize device parameters, including interface statistics like bytes in/out and packet counts. A network management station can periodically send SNMP GET requests to a router to retrieve these specific interface counters, enabling the calculation and central monitoring of bandwidth utilization over time on a serial interface.
- ✗
Syslog
Why it's wrong here
Syslog is a protocol designed for the centralized collection of system and application log messages from various network devices. It operates as a push-based mechanism, where devices send event notifications (e.g., interface up/down, security alerts) as they occur, rather than allowing a management station to pull data. Syslog is not designed to expose or allow polling of real-time performance metrics or interface counters, which are necessary for calculating bandwidth utilization.
When this WOULD be correct
Syslog would be correct if the question asked for a protocol to receive unsolicited log messages from network devices, such as error events or security alerts, for central monitoring and alerting.
- ✗
NetFlow
Why it's wrong here
NetFlow collects traffic flow metadata (source/destination IPs, ports, protocols) for traffic analysis and billing, not periodic polling of cumulative interface byte counters. The requirement is for a tool that polls current interface counters at intervals; NetFlow exports flow records asynchronously from the router, lacking the on-demand counter retrieval that SNMP GET requests provide. It is tempting because NetFlow is commonly used for bandwidth monitoring, but it does not support the polling mechanism specified in the scenario.
When this WOULD be correct
A network administrator wants to analyze traffic patterns and identify top talkers on a router's serial interface over time. The monitoring tool needs to collect detailed flow records (source/destination IP, ports, protocols) for traffic engineering. NetFlow would be the correct protocol.
- ✗
ICMP
Why it's wrong here
The Internet Control Message Protocol (ICMP) is primarily an error-reporting and diagnostic protocol used within the IP suite. While essential for tools like `ping` to test host reachability and `traceroute` to map network paths, ICMP packets themselves do not carry or expose any information about a router's interface bandwidth utilization or performance counters. Therefore, it is unsuitable for monitoring bandwidth utilization.
When this WOULD be correct
A question asking which protocol is used to test basic connectivity between two hosts, such as verifying if a remote device is reachable, would have ICMP as 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.
✓SNMPCorrect answer▾
Why this is correct
SNMP (Simple Network Management Protocol) is the industry-standard protocol for managing and monitoring network devices. It utilizes Management Information Bases (MIBs) to organize device parameters, including interface statistics like bytes in/out and packet counts. A network management station can periodically send SNMP GET requests to a router to retrieve these specific interface counters, enabling the calculation and central monitoring of bandwidth utilization over time on a serial interface.
✗SyslogWrong answer — click to see why▾
Why this is wrong here
Syslog is used for logging and event messages, not for polling interface counters. It is a push-based protocol, whereas the question requires a pull-based mechanism to periodically poll for bandwidth utilization data.
★ When this WOULD be the correct answer
Syslog would be correct if the question asked for a protocol to receive unsolicited log messages from network devices, such as error events or security alerts, for central monitoring and alerting.
Why candidates choose this
Candidates may confuse Syslog with SNMP because both are used for network monitoring, but Syslog is for event logging, not for polling performance metrics like bandwidth utilization.
✗NetFlowWrong answer — click to see why▾
Why this is wrong here
NetFlow is used for traffic flow analysis and accounting, not for polling interface counters like bandwidth utilization. It exports flow data to a collector, whereas the question requires periodic polling of counters, which is SNMP's function.
★ When this WOULD be the correct answer
A network administrator wants to analyze traffic patterns and identify top talkers on a router's serial interface over time. The monitoring tool needs to collect detailed flow records (source/destination IP, ports, protocols) for traffic engineering. NetFlow would be the correct protocol.
Why candidates choose this
Candidates may confuse NetFlow's traffic monitoring capability with bandwidth monitoring, assuming it can provide utilization data. They might overlook that NetFlow is flow-based and not designed for polling interface counters like SNMP does.
✗ICMPWrong answer — click to see why▾
Why this is wrong here
ICMP is used for network diagnostics like ping and traceroute, not for polling interface counters or bandwidth utilization over time.
★ When this WOULD be the correct answer
A question asking which protocol is used to test basic connectivity between two hosts, such as verifying if a remote device is reachable, would have ICMP as the correct answer.
Why candidates choose this
Candidates may confuse ICMP's role in network monitoring (e.g., ping for reachability) with the need to poll interface statistics, assuming ICMP can provide bandwidth data.
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?”
Go deeper
Related to this question
Learn chapter
Network Documentation and Diagrams
Key term
Router
A router is a networking device that connects different networks together and directs data traffic between them by choosing the best path for data to travel.
Key term
Management Information Base
A Management Information Base (MIB) is a virtual database that stores information about network devices, organized as a hierarchical tree, which network management tools use to monitor and control those devices.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.