mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a Control Plane Policing (CoPP) issue:
R1# show policy-map control-plane input class class-default
Class-map: class-default (match-any) 0 packets, 0 bytes 5 minute offered rate 0 bps, drop rate 0 bps Match: any police: cir 1000000 bps, bc 31250 bytes, be 31250 bytes conformed 0 packets, 0 bytes; actions: transmit violated 0 packets, 0 bytes; actions: drop conformed 0 bps, exceed 0 bps, violated 0 bps
What does this output indicate?
⚠ Common exam trap
Cisco often tests the misconception that zero packet counts in a CoPP policy indicate the policy is working correctly (e.g., no traffic is being dropped), when in fact it indicates a classification failure, such as a missing ACL or incorrect class-map configuration.
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 not matching any traffic, indicating a possible ACL or class-map misconfiguration.
The output shows zero packets matched in class-default, meaning no traffic is being classified by the CoPP policy. This indicates a possible misconfiguration in the ACL or class-map that defines the traffic to be policed, causing the policy to be effectively inactive. A correctly configured CoPP policy would show non-zero packet counts for matched 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 due to a misconfigured CIR.
Why it's wrong here
The CIR is set to 1 Mbps, but no packets have been dropped because none have matched the class.
- ✓
The CoPP policy is not matching any traffic, indicating a possible ACL or class-map misconfiguration.
Why this is correct
The class-default matches all traffic, but zero packets have been seen, suggesting the policy may not be applied correctly or the interface is idle.
- ✗
The CoPP policy is working correctly and policing traffic at 1 Mbps.
Why it's wrong here
While the policy is configured, no traffic has been processed, so it cannot be confirmed as working.
- ✗
The CoPP policy is only applied to the output direction.
Why it's wrong here
The command specifies 'input', so it is applied to incoming traffic.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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