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300-410 Practice Question: An engineer is troubleshooting why the NMS is not…
An engineer is troubleshooting why the NMS is not receiving SNMP traps for interface up/down events on router R4. The configuration includes 'snmp-server enable traps snmp linkdown linkup' and 'snmp-server host 10.1.1.200 version 2c public'. The NMS can receive other traps from R4. What is the most likely cause?
⚠ Common exam trap
Cisco often tests the misconception that multiple trap keywords can be combined in a single 'snmp-server enable traps' command, when in fact each specific trap (like 'linkdown' and 'linkup') requires its own separate command to be enabled.
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 engineer combined 'linkdown' and 'linkup' in a single command; they must be configured as separate 'snmp-server enable traps' commands.
Cisco IOS requires that 'linkdown' and 'linkup' be configured in separate 'snmp-server enable traps' commands when using the 'snmp-server enable traps snmp' syntax. Combining them in a single command is syntactically invalid; the router will not enable either trap type, which explains why the NMS receives other traps but not link up/down events.
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 engineer combined 'linkdown' and 'linkup' in a single command; they must be configured as separate 'snmp-server enable traps' commands.
Why this is correct
Correct because the IOS syntax requires separate commands for each trap type; combining them is invalid.
- ✗
The NMS is configured to filter out link up/down traps, so they are not displayed.
Why it's wrong here
Incorrect because the NMS receives other traps, indicating the issue is on the router side.
- ✗
The router needs the 'snmp-server trap-source' command to specify the loopback interface for traps.
Why it's wrong here
Incorrect because other traps are received, so trap-source is not the issue.
- ✗
The 'snmp-server host' command must include the 'udp-port' option to specify port 162.
Why it's wrong here
Incorrect because the default UDP port for traps is 162, so that is not required.
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Last reviewed: Jul 4, 2026
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