hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show policy-map control-plane
Control Plane
Service-policy input: CoPP-IN
Class-map: CoPP-BGP (match-all) 0 packets, 0 bytes 5 minute offered rate 0000 bps, drop rate 0000 bps Match: access-group 120 police: cir 32000 bps, bc 6000 bytes, be 6000 bytes conformed 0 packets, 0 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop
R1# show ip bgp summary
BGP router identifier 1.1.1.1, local AS number 100 BGP table version is 1, main routing table version 1
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 10.1.1.2 4 200 10 10 1 0 0 00:05:00 5
Based on this output, what is the most likely problem?
⚠ Common exam trap
Cisco often tests the misconception that a zero packet count under a CoPP class implies the policer is dropping all traffic, when in fact it indicates the classification is failing and traffic is not being evaluated by that policy.
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 access-list 120 is not matching BGP traffic, so it is falling into class-default.
The CoPP policy shows zero packets matched under class CoPP-BGP, which uses access-group 120. Since the BGP session to 10.1.1.2 is up and exchanging routes, BGP traffic is not being classified by the policy and is instead falling into the default class, which typically permits all traffic. This indicates that access-list 120 does not match the BGP packets, likely due to incorrect ACL entries or direction.
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 BGP session is down.
Why it's wrong here
The BGP summary shows the neighbor is up with state established.
- ✓
The access-list 120 is not matching BGP traffic, so it is falling into class-default.
Why this is correct
The zero packet count indicates the class is not matching, but BGP is working, so traffic is matched by class-default.
- ✗
The police rate is too low and is dropping all BGP packets.
Why it's wrong here
The counters show 0 packets, so no packets have been classified.
- ✗
The policy-map is applied to the output direction.
Why it's wrong here
The output shows input direction.
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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.