The answer is that the SNMP agent is correctly responding to a GetRequest from the NMS at 10.1.1.1. This is correct because the debug snmp packets output shows a complete and error-free exchange: the agent receives a GetRequest for the sysDescr OID (1.3.6.1.2.1.1.1.0) using the community string “public,” and immediately sends back a GetResponse with errstat 0 and errindex 0, confirming the requested value. On the Cisco CCNP ENARSI 300-410 exam, interpreting debug snmp packets output tests your ability to verify SNMP agent functionality and troubleshoot common misconfigurations like incorrect community strings or ACL blocks. A common trap is focusing only on the request and missing the response’s error status—here, errstat 0 is the key indicator of success. For a quick memory tip, remember “GetRequest with errstat 0 means the agent is a hero”—zero errors means the SNMP agent is responding as expected.
300-410 SNMP Troubleshooting Practice Question
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.
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
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 snmp packets command shows SNMP packet exchanges. The output shows a successful GetRequest from 10.1.1.1 with community 'public' for sysDescr, and a GetResponse with no errors, indicating the SNMP agent is responding correctly.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 output shows a GetRequest followed by a GetResponse with errstat 0, indicating successful communication.
Related concept
Standard ACLs match source addresses.
✗
The SNMP agent is failing to process the request due to a community string mismatch.
Why it's wrong here
The community string 'public' is shown in the request, and the response has no error, so there is no mismatch.
✗
The SNMP agent is sending a trap to the NMS at 10.1.1.1.
Why it's wrong here
The debug shows a GetRequest/GetResponse exchange, not a trap.
✗
The SNMP agent is ignoring the request due to an ACL blocking the NMS.
Why it's wrong here
The output shows the packet was received and processed, so no ACL is blocking it.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Trap categories for this question
Command / output trap
The community string 'public' is shown in the request, and the response has no error, so there is no mismatch.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
SNMP Troubleshooting — This question tests SNMP Troubleshooting — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The SNMP agent is correctly responding to a GetRequest from the NMS at 10.1.1.1. — The debug snmp packets command shows SNMP packet exchanges. The output shows a successful GetRequest from 10.1.1.1 with community 'public' for sysDescr, and a GetResponse with no errors, indicating the SNMP agent is responding correctly.
What should I do if I get this 300-410 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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