mediumMultiple Choice
300-410 Practice Question: Runs the following command to troubleshoot an…
A network engineer runs the following command to troubleshoot an SNMP issue:
R1# debug snmp packets SNMP: Packet received via UDP from 10.1.1.1 on port 161 SNMP: GetRequest, reqid 12345, errstat 0, errindex 0 SNMP: Community string: public SNMP: MIB object: 1.3.6.1.2.1.1.1.0 (sysDescr) SNMP: Value: Cisco IOS Software, C1900 Software (C1900-UNIVERSALK9-M), Version 15.7(3)M SNMP: Packet sent via UDP to 10.1.1.1 on port 161 SNMP: GetResponse, reqid 12345, errstat 0, errindex 0
What does this debug output indicate?
⚠ Common exam trap
Cisco often tests the distinction between SNMP Get/Set operations (which use UDP 161) and SNMP traps/informs (which use UDP 162), so candidates may mistakenly interpret a GetResponse as a trap if they overlook the direction and port details in the debug output.
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 SNMP agent is correctly responding to a GetRequest from the NMS at 10.1.1.1.
The debug output shows a complete SNMP GetRequest/GetResponse exchange between the NMS at 10.1.1.1 and the router acting as an SNMP agent. The agent receives a GetRequest for sysDescr (OID 1.3.6.1.2.1.1.1.0), processes it successfully (errstat 0, errindex 0), and sends back a GetResponse containing the system description. This confirms the SNMP agent is functioning correctly and responding to queries from the NMS.
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 SNMP agent is correctly responding to a GetRequest from the NMS at 10.1.1.1.
Why this is correct
The debug shows a complete SNMP transaction: the agent received a GetRequest for sysDescr from 10.1.1.1, returned errstat 0, and sent a GetResponse with the correct value. This confirms the agent is functioning and answering the NMS, so no SNMP fault exists on R1.
- ✗
The SNMP agent is failing to process the request due to a community string mismatch.
Why it's wrong here
The output shows errstat 0 and a successful GetResponse, so the community string was accepted and the request processed. A mismatch would instead produce an authentication failure or silence. It is tempting because community-string errors are a common SNMP fault, but the debug proves authentication succeeded here.
- ✗
The SNMP agent is sending a trap to the NMS at 10.1.1.1.
Why it's wrong here
The exchange is a solicited GetRequest answered by a GetResponse from port 161, not an unsolicited trap, which agents send to port 162. Traps are tempting because they also carry SNMP notifications, and would be correct if the agent initiated an alert without a poll.
- ✗
The SNMP agent is ignoring the request due to an ACL blocking the NMS.
Why it's wrong here
The agent received the request and replied, so no ACL dropped the traffic; a blocked NMS would yield no received packet or response. ACLs are tempting because they commonly cause silent SNMP failures, and would be the answer if the debug showed requests arriving without replies.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco 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 300-410 exam.