mediumMultiple Choice
300-410 Practice Question: Runs the following command to verify CoPP…
A network engineer runs the following command to verify CoPP (Control Plane Policing) with route-maps:
R1# show policy-map control-plane input class class-default
Control Plane
Service-policy input: CoPP
Class-map: class-default (match-any) 12234 packets, 1234567 bytes 5 minute offered rate 1000 bps, drop rate 0 bps Match: any police: cir 8000 bps, bc 1500 bytes, be 1500 bytes conformed 12234 packets, 1234567 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop
What does this output indicate?
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 CoPP policy is allowing all traffic and not dropping any packets.
The output shows the CoPP policy applied to the control plane. The class-default matches all traffic and polices it at 8000 bps. All packets have conformed and been transmitted, with no drops. This indicates that the CoPP policy is working and not dropping any traffic.
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 CoPP policy is dropping all traffic because the CIR is too low.
Why it's wrong here
The counters show 12,234 packets conformed and transmitted, with zero exceeded and zero violated, so nothing is being dropped despite the 8,000 bps CIR. It is tempting because a low CIR can cause drops, but that would appear under exceeded or violated, which are both zero here.
- ✓
The CoPP policy is allowing all traffic and not dropping any packets.
Why this is correct
Conformed packets equal total packets with exceeded and violated both zero, so every packet matched class-default is transmitted. The policy-map applies policing at 8000 bps, yet no traffic has breached it, confirming nothing is dropped.
- ✗
The CoPP policy is only matching specific traffic classes.
Why it's wrong here
The output shows class-default matching any traffic, with all 12234 packets conformed and transmitted, so no specific classes are matched. It is tempting because class-default can carry classified traffic, which would be correct if named classes with match statements appeared in the output.
- ✗
The CoPP policy is not applied to the control plane.
Why it's wrong here
The service-policy input CoPP is bound to the control plane and counters are incrementing, so it is applied. It is tempting because an unapplied policy shows no counters, which would be correct if the interface or control-plane attachment were missing.
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JA
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.