N10-009 Network Operations Practice Question
A network administrator wants to be alerted immediately when any interface on a core router goes down. The administrator has already configured SNMP community strings. Which additional configuration is necessary to receive these alerts?
⚠ Common exam trap
CompTIA often tests the distinction between polling (SNMP get/walk) and event-driven notifications (traps), and candidates mistakenly choose periodic polling (Option C) thinking it provides 'immediate' alerts, not realizing that polling introduces latency and is not truly immediate.
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
✓
A) Configure the router to send SNMP traps to the NMS
SNMP traps are unsolicited notifications sent from the managed device (the router) to the Network Management Station (NMS) when a specific event occurs, such as an interface going down. Since the administrator wants immediate alerts without polling, configuring the router to send SNMP traps to the NMS is the correct approach. The SNMP community strings are already set, so the missing piece is the trap destination and enabling trap generation for interface state changes.
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) Configure the router to send SNMP traps to the NMS
Why this is correct
Configuring a router to send SNMP traps to the Network Management System (NMS) is the correct method for receiving immediate alerts. SNMP traps are unsolicited notification messages sent by the network device (agent) to the NMS (manager) when a significant event, such as an interface going down, occurs. This push-based mechanism ensures real-time notification without requiring the NMS to constantly poll the device, making it highly efficient for critical event monitoring.
- ✗
B) Perform an SNMP walk of the interface OIDs
Why it's wrong here
Performing an SNMP walk of interface OIDs is incorrect because an SNMP walk is a polling operation initiated by the NMS to retrieve a sequence of variables within a specified branch of the Management Information Base (MIB) tree. While it can gather comprehensive interface status data, it is a pull-based method that only discovers an interface down event during its next scheduled execution. This does not provide the immediate, real-time alerts required for critical infrastructure monitoring.
When this WOULD be correct
This option would be correct if the question asked: 'A network administrator wants to audit all configurable parameters on a router to ensure no unauthorized changes have been made. Which SNMP operation should be used?' In that case, an SNMP walk would retrieve the entire MIB tree for review.
- ✗
C) Use SNMP get to retrieve interface status periodically
Why it's wrong here
Using SNMP get to retrieve interface status periodically is incorrect because SNMP get is a polling operation where the NMS explicitly requests the value of a specific managed object from a device. While repeated 'get' requests could eventually detect an interface failure, this method is inefficient for immediate alerts. It generates continuous network traffic and places a significant processing burden on both the NMS and the monitored device, without guaranteeing instant notification of critical events.
When this WOULD be correct
A network administrator needs to monitor interface utilization trends over time. By using SNMP get to periodically retrieve interface OIDs, the NMS can collect historical data for analysis and reporting.
- ✗
D) Configure SNMP set to change interface parameters
Why it's wrong here
Configuring SNMP set is incorrect because this operation is used by the Network Management System (NMS) to actively modify or write configuration parameters on a managed network device. For instance, an SNMP set command could be used to administratively shut down an interface or change its IP address. It is a command for configuration changes, not a mechanism for the device to autonomously send alerts about its operational status to the NMS.
When this WOULD be correct
In a scenario where a network administrator needs to remotely disable an interface on a router via SNMP to mitigate a security incident, configuring SNMP set would be necessary to change the interface status.
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.
✓A) Configure the router to send SNMP traps to the NMSCorrect answer▾
Why this is correct
Configuring a router to send SNMP traps to the Network Management System (NMS) is the correct method for receiving immediate alerts. SNMP traps are unsolicited notification messages sent by the network device (agent) to the NMS (manager) when a significant event, such as an interface going down, occurs. This push-based mechanism ensures real-time notification without requiring the NMS to constantly poll the device, making it highly efficient for critical event monitoring.
✗B) Perform an SNMP walk of the interface OIDsWrong answer — click to see why▾
Why this is wrong here
Performing an SNMP walk retrieves all OID values from the router, but it does not configure the router to send unsolicited alerts. The administrator needs the router to proactively send notifications when an interface goes down, which requires configuring SNMP traps, not polling.
★ When this WOULD be the correct answer
This option would be correct if the question asked: 'A network administrator wants to audit all configurable parameters on a router to ensure no unauthorized changes have been made. Which SNMP operation should be used?' In that case, an SNMP walk would retrieve the entire MIB tree for review.
Why candidates choose this
Candidates may confuse the act of monitoring (polling) with receiving alerts (traps). They might think that walking the interface OIDs will somehow trigger notifications, not realizing that traps require explicit configuration on the agent.
✗C) Use SNMP get to retrieve interface status periodicallyWrong answer — click to see why▾
Why this is wrong here
SNMP get retrieves data on demand, not automatically. The administrator wants immediate alerts when an interface goes down, which requires the router to proactively send traps, not periodic polling.
★ When this WOULD be the correct answer
A network administrator needs to monitor interface utilization trends over time. By using SNMP get to periodically retrieve interface OIDs, the NMS can collect historical data for analysis and reporting.
Why candidates choose this
Candidates may confuse proactive alerting (traps) with reactive monitoring (polling). They might think that frequent polling can provide near-real-time alerts, but it cannot guarantee immediate notification and wastes bandwidth.
✗D) Configure SNMP set to change interface parametersWrong answer — click to see why▾
Why this is wrong here
SNMP set is used to modify configuration parameters on a device, not to receive alerts. The question asks for receiving immediate notifications when an interface goes down, which requires traps, not set operations.
★ When this WOULD be the correct answer
In a scenario where a network administrator needs to remotely disable an interface on a router via SNMP to mitigate a security incident, configuring SNMP set would be necessary to change the interface status.
Why candidates choose this
Candidates may confuse SNMP set with SNMP trap configuration, thinking that setting parameters is part of alert configuration, or they may not clearly distinguish between SNMP operations (get, set, trap) and their purposes.
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?”
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Related to this question
Learn chapter
Network Documentation and Diagrams
Key term
Out-of-band
Out-of-band refers to a separate, dedicated network path used for managing and configuring IT devices, distinct from the main data traffic path.
Key term
SNMP
A network protocol used to collect and organize information about managed devices on IP networks and to modify that information to change device behavior.
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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.