Question 1,516 of 2,152

SNMP Troubleshooting →mediumMultiple ChoiceObjective-mapped

Duplicate SNMP Traps: Multiple snmp-server host Commands

This 300-410 practice question tests your understanding of snmp troubleshooting. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.

An engineer is troubleshooting why the NMS is receiving duplicate SNMP traps from router R9 for the same event. The router has two 'snmp-server host' commands pointing to the same NMS IP address but with different community strings: 'public' and 'private'. The NMS is configured to process traps from both communities. What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The router sends one trap per 'snmp-server host' command, resulting in duplicate traps for the same event.
Correct because each host command generates a separate trap; using two communities causes duplication.
B
The NMS is configured to listen on two different ports, causing duplicate reception.
Why wrong: Incorrect because the NMS listens on a single port; the router sends to the same port.
C
The router has an SNMP trap filter that is misconfigured, causing the same trap to be sent twice.
Why wrong: Incorrect because trap filters suppress traps, not duplicate them.
D
The engineer enabled both 'snmp-server enable traps' and 'snmp-server enable informs', causing duplicate notifications.
Why wrong: Incorrect because traps and informs are different; the host commands specify which type.

Full breakdown with real-world context →

Quick Answer

The answer is that the router sends one trap per `snmp-server host` command, resulting in duplicate SNMP traps for the same event. This occurs because each `snmp-server host` statement creates an independent trap destination entry, even when pointing to the same NMS IP address. When an event triggers a trap, the router generates a separate packet for each configured community string—in this case, one for 'public' and one for 'private'. The NMS then receives two identical traps because it is configured to accept both communities. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of SNMP trap generation logic and the distinction between host configuration and notification filtering. A common pitfall is assuming that multiple community strings on the same host are merged into a single trap; they are not. Memory tip: "One host line, one trap copy"—each `snmp-server host` command is an independent trigger, so duplicate lines mean duplicate traps.

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 router sends one trap per 'snmp-server host' command, resulting in duplicate traps for the same event.

Each 'snmp-server host' command creates a separate trap destination entry in the router's SNMP configuration. When a trap-generating event occurs, the router sends a trap to each configured destination. Since both commands point to the same NMS IP address but with different community strings ('public' and 'private'), the router sends two identical traps (one with each community string) for the same event, causing the NMS to receive duplicates.

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 router sends one trap per 'snmp-server host' command, resulting in duplicate traps for the same event.
Why this is correct
Correct because each host command generates a separate trap; using two communities causes duplication.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The NMS is configured to listen on two different ports, causing duplicate reception.
Why it's wrong here
Incorrect because the NMS listens on a single port; the router sends to the same port.
✗
The router has an SNMP trap filter that is misconfigured, causing the same trap to be sent twice.
Why it's wrong here
Incorrect because trap filters suppress traps, not duplicate them.
✗
The engineer enabled both 'snmp-server enable traps' and 'snmp-server enable informs', causing duplicate notifications.
Why it's wrong here
Incorrect because traps and informs are different; the host commands specify which type.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the misconception that multiple 'snmp-server host' commands with the same IP but different communities are redundant or that the router deduplicates them, when in fact each command generates a separate trap transmission.

Trap categories for this question

Command / output trap
Incorrect because traps and informs are different; the host commands specify which type.

Detailed technical explanation

How to think about this question

Under the hood, the 'snmp-server host' command creates an entry in the router's SNMP notification receiver table, and each entry is processed independently. When an event triggers a trap, the router iterates through all configured receivers and sends a separate SNMPv2c Trap PDU (or SNMPv1 Trap) to each, including the community string specified in that command. In real-world scenarios, this duplication can overwhelm the NMS or cause false alarms, so best practice is to use a single 'snmp-server host' command with a single community string, or use SNMPv3 with user-based security to avoid community-based duplication.

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 300-410 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.

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 router sends one trap per 'snmp-server host' command, resulting in duplicate traps for the same event. — Each 'snmp-server host' command creates a separate trap destination entry in the router's SNMP configuration. When a trap-generating event occurs, the router sends a trap to each configured destination. Since both commands point to the same NMS IP address but with different community strings ('public' and 'private'), the router sends two identical traps (one with each community string) for the same event, causing the NMS to receive duplicates.

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.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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