mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot…
A network engineer runs the following command to troubleshoot Control Plane Policing (CoPP):
R1# show policy-map control-plane input class class-default
Class-map: class-default (match-any) 140091 packets, 12345678 bytes 5 minute offered rate 1000 bps, drop rate 0 bps Match: any police: cir 8000 bps, bc 1500 bytes conformed 140091 packets, 12345678 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop
What does this output indicate?
⚠ Common exam trap
Cisco often tests the misconception that a police statement with a CIR automatically means packets are being dropped, but the actual drop counters must be checked to confirm drops are occurring.
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
✓
CoPP is rate-limiting traffic to 8000 bps and not dropping any packets.
The output shows that the class-default policy-map for control-plane input has a police statement with a CIR of 8000 bps. The counters indicate 140,091 packets conformed and transmitted, with zero packets exceeded or violated. Since the drop rate is 0 bps and no packets have been dropped, CoPP is rate-limiting traffic to 8000 bps without any drops occurring.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
CoPP is dropping all traffic to the control plane.
Why it's wrong here
No packets are exceeded or violated; all are transmitted.
- ✓
CoPP is rate-limiting traffic to 8000 bps and not dropping any packets.
Why this is correct
The police cir is 8000 bps, and all packets conform, so they are transmitted.
- ✗
CoPP is not configured; the class-default shows no action.
Why it's wrong here
The police action is configured and active.
- ✗
CoPP is dropping packets due to exceeding the rate.
Why it's wrong here
Exceeded and violated counts are zero.
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