- A
The NMS is configured with a community string that does not match the community string used in the 'snmp-server host' command on the router.
Correct. The NMS will discard traps from the router because the community strings do not match, preventing reception.
- B
The router has an ACL applied to its VTY lines that denies UDP port 162.
Why wrong: Incorrect. VTY lines are for management access (SSH/Telnet) and do not affect SNMP trap delivery.
- C
The 'snmp-server enable traps' command is missing from the router configuration.
Correct. Without 'snmp-server enable traps', the router does not generate traps, so the NMS receives none.
- D
The NMS is listening on UDP port 161 instead of UDP port 162.
Why wrong: Incorrect. The NMS can be configured to listen on any port; listening on 161 does not inherently prevent receiving traps if it also listens on 162 or is configured to listen on other ports.
- E
The 'snmp-server host' command specifies the IP address of a different NMS.
Why wrong: Incorrect. While this would cause traps to be sent to a different NMS, the question asks for actions that prevent the NMS from receiving traps. This is a destination misconfiguration, but it is not considered a typical prevention action in this context.
300-410 SNMP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of snmp troubleshooting. 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.
Which TWO actions will prevent an SNMPv2c NMS from receiving traps from a Cisco router? (Choose TWO.)
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
The NMS is configured with a community string that does not match the community string used in the 'snmp-server host' command on the router.
In SNMPv2c, a community string mismatch (Option A) prevents the NMS from authenticating and accepting traps. Additionally, the 'snmp-server enable traps' command (Option C) is required on the router to generate traps; without it, no traps are sent. Option D is incorrect because the NMS can be configured to listen on any port; if it listens on 161 it will receive SNMP queries but not traps, but this does not prevent trap reception if the NMS also listens on 162. Option E is incorrect because if 'snmp-server host' points to a different NMS, the trap is still sent to that NMS, but the original NMS would not receive it—however, that is a destination misconfiguration, not a prevention mechanism; in this context, it is not considered a typical prevention action.
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.
- ✓
The NMS is configured with a community string that does not match the community string used in the 'snmp-server host' command on the router.
Why this is correct
Correct. The NMS will discard traps from the router because the community strings do not match, preventing reception.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The router has an ACL applied to its VTY lines that denies UDP port 162.
- ✓
The 'snmp-server enable traps' command is missing from the router configuration.
Why this is correct
Correct. Without 'snmp-server enable traps', the router does not generate traps, so the NMS receives none.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The NMS is listening on UDP port 161 instead of UDP port 162.
Why it's wrong here
Incorrect. The NMS can be configured to listen on any port; listening on 161 does not inherently prevent receiving traps if it also listens on 162 or is configured to listen on other ports.
- ✗
The 'snmp-server host' command specifies the IP address of a different NMS.
Why it's wrong here
Incorrect. While this would cause traps to be sent to a different NMS, the question asks for actions that prevent the NMS from receiving traps. This is a destination misconfiguration, but it is not considered a typical prevention action in this context.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between the 'snmp-server enable traps' command (which enables trap generation) and the 'snmp-server host' command (which specifies the destination), leading candidates to overlook that both are required for trap delivery.
Detailed technical explanation
How to think about this question
SNMP traps are unsolicited notifications sent from the agent (router) to the manager (NMS) on UDP port 162. The 'snmp-server enable traps' command globally enables trap generation, while 'snmp-server host' defines the target NMS and community string. Without 'snmp-server enable traps', the router will not generate any traps even if the host is configured. In real-world scenarios, misconfigured community strings are a common cause of trap loss, and verifying both the enable and host commands is essential during troubleshooting.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this 300-410 question test?
SNMP Troubleshooting — This question tests SNMP Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The NMS is configured with a community string that does not match the community string used in the 'snmp-server host' command on the router. — In SNMPv2c, a community string mismatch (Option A) prevents the NMS from authenticating and accepting traps. Additionally, the 'snmp-server enable traps' command (Option C) is required on the router to generate traps; without it, no traps are sent. Option D is incorrect because the NMS can be configured to listen on any port; if it listens on 161 it will receive SNMP queries but not traps, but this does not prevent trap reception if the NMS also listens on 162. Option E is incorrect because if 'snmp-server host' points to a different NMS, the trap is still sent to that NMS, but the original NMS would not receive it—however, that is a destination misconfiguration, not a prevention mechanism; in this context, it is not considered a typical prevention action.
What should I do if I get this 300-410 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: Jul 4, 2026
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