The answer is SNMP traps. Traps are the correct choice because they are unsolicited, event-driven messages sent directly from the SNMP agent on the switch to the network management system (NMS), providing immediate notification when a critical interface goes down. Unlike SNMP polling, which relies on the NMS to periodically request status and can introduce delays, traps push the alert in real time, ensuring the administrator is notified the moment the link fails. On the CompTIA Network+ N10-009 exam, this question tests your understanding of the difference between active polling and passive trap-based monitoring—a common trick is that polling is for routine health checks, while traps are for urgent, unsolicited alerts. A helpful memory tip: think of a trap as a “tripwire” that snaps and alerts you instantly, whereas polling is like checking a security camera feed every five minutes.
N10-009 Network Operations Practice Question
This N10-009 practice question tests your understanding of network operations. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 be notified immediately when a critical switch interface goes down. Which SNMP feature should be configured?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Why wrong: Polling requires the management station to periodically request information, which does not provide immediate notification of events.
B
Traps
Traps are event-driven notifications sent by the device to the management station, providing immediate alerting.
C
Informs
Why wrong: Informs are also event-driven but include acknowledgment; they are not the most basic SNMP notification feature and are not as widely used as traps for simple alerting.
D
Set
Why wrong: Set is used to change configuration values on the device, not to receive notifications.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Traps
B is correct because SNMP traps are unsolicited messages sent from an SNMP agent to the network management system (NMS) to immediately notify the administrator of a critical event, such as a switch interface going down. Unlike polling, which requires the NMS to periodically request status information, traps provide real-time, event-driven alerts without delay, ensuring the administrator is notified as soon as the interface state changes.
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.
✗
Polling
Why it's wrong here
Polling requires the management station to periodically request information, which does not provide immediate notification of events.
✓
Traps
Why this is correct
Traps are event-driven notifications sent by the device to the management station, providing immediate alerting.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Informs
Why it's wrong here
Informs are also event-driven but include acknowledgment; they are not the most basic SNMP notification feature and are not as widely used as traps for simple alerting.
✗
Set
Why it's wrong here
Set is used to change configuration values on the device, not to receive notifications.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between traps and informs, where candidates mistakenly choose informs thinking they are more reliable for critical alerts, but the question emphasizes 'immediately notified,' making the unacknowledged, low-latency trap the correct choice.
Detailed technical explanation
How to think about this question
SNMP traps are defined in RFC 1157 and use UDP port 162 to send event notifications from the agent to the NMS without waiting for a response, making them ideal for urgent events like linkDown (OID 1.3.6.1.6.3.1.1.5.3). In contrast, informs (RFC 3413) add reliability by requiring an acknowledgment, but this introduces additional network traffic and processing, which can be undesirable in high-volume or time-sensitive scenarios. A real-world example is a network operations center (NOC) relying on traps to immediately detect and respond to a critical switch port failure, while polling might miss the event until the next cycle.
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: Traps — B is correct because SNMP traps are unsolicited messages sent from an SNMP agent to the network management system (NMS) to immediately notify the administrator of a critical event, such as a switch interface going down. Unlike polling, which requires the NMS to periodically request status information, traps provide real-time, event-driven alerts without delay, ensuring the administrator is notified as soon as the interface state changes.
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: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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