- A
There are 25 SNMP requests with invalid community strings.
The 'Unknown community name' counter of 25 indicates that many requests used community strings not recognized by the router.
- B
The router has sent 150 trap PDUs.
Why wrong: The 'Trap PDUs' counter is 0, meaning no traps were sent.
- C
There were 10 set requests that failed due to bad values.
Why wrong: Set-request PDUs are 0, so no set requests were received.
- D
The router received 200 SNMP packets.
Why wrong: The router received 150 packets (SNMP packets input: 150).
Question 15 of 2,152
Show SNMP Statistics — Interpreting Errors
This 300-410 practice question tests your understanding of snmp troubleshooting. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 engineer runs the following command on Router R1:
R1# show snmp statistics SNMP packets input: 150
Bad SNMP version errors: 0 Unknown community name: 25 Illegal operation for community name: 0 Encoding errors: 0 Number of requested variables: 300 Number of altered variables: 0 Get-request PDUs: 120 Get-next PDUs: 30 Set-request PDUs: 0
SNMP packets output: 200
Too big errors: 0
No such name errors: 10
Bad values errors: 0 General errors: 0 Response PDUs: 200 Trap PDUs: 0
Based on this output, which statement is correct?
Quick Answer
The correct statement is that there are 25 SNMP requests with invalid community strings. This is directly supported by the "Unknown community name: 25" counter in the show snmp statistics output, which increments whenever an SNMP request arrives with a community string that does not match any configured on the router. In the context of the Cisco CCNP ENARSI 300-410 exam, interpreting these error counters tests your ability to diagnose SNMP configuration mismatches and access control issues, a common troubleshooting scenario. A frequent trap is confusing "Unknown community name" with "No such name errors"—the latter indicates the requested MIB object doesn't exist on the device, not an authentication failure. To remember the distinction, think of "community" as the password for access, while "name" refers to the specific data object being queried.
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
✓
There are 25 SNMP requests with invalid community strings.
The 'Unknown community name: 25' counter indicates that 25 incoming SNMP packets contained a community string that did not match any configured community on Router R1. This means those requests were rejected due to invalid community strings, making option A correct.
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.
- ✓
There are 25 SNMP requests with invalid community strings.
Why this is correct
The 'Unknown community name' counter of 25 indicates that many requests used community strings not recognized by the router.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The router has sent 150 trap PDUs.
Why it's wrong here
The 'Trap PDUs' counter is 0, meaning no traps were sent.
- ✗
There were 10 set requests that failed due to bad values.
Why it's wrong here
Set-request PDUs are 0, so no set requests were received.
- ✗
The router received 200 SNMP packets.
Why it's wrong here
The router received 150 packets (SNMP packets input: 150).
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between input and output packet counters, tricking candidates into confusing the total input (150) with the total output (200) or misinterpreting specific error counters like 'Unknown community name' as a different type of failure.
Detailed technical explanation
How to think about this question
SNMP community strings act as a simple authentication mechanism, and the 'Unknown community name' counter increments when a request uses a community string not defined in the router's SNMP configuration. This is distinct from 'Bad SNMP version errors' (version mismatch) or 'Illegal operation for community name' (community exists but lacks read/write permissions). In real-world troubleshooting, a high 'Unknown community name' count often indicates misconfigured NMS systems or unauthorized access attempts.
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.
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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: There are 25 SNMP requests with invalid community strings. — The 'Unknown community name: 25' counter indicates that 25 incoming SNMP packets contained a community string that did not match any configured community on Router R1. This means those requests were rejected due to invalid community strings, making option A correct.
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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