- A
CoPP is dropping all traffic to the control plane.
Why wrong: No packets are exceeded or violated; all are transmitted.
- B
CoPP is rate-limiting traffic to 8000 bps and not dropping any packets.
The police cir is 8000 bps, and all packets conform, so they are transmitted.
- C
CoPP is not configured; the class-default shows no action.
Why wrong: The police action is configured and active.
- D
CoPP is dropping packets due to exceeding the rate.
Why wrong: Exceeded and violated counts are zero.
Question 1,097 of 2,152
How to Interpret CoPP 'show policy-map control-plane input class-default'
This 300-410 practice question tests your understanding of device management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
Quick Answer
The answer is that CoPP is rate-limiting traffic to 8000 bps and not dropping any packets. This is correct because the output shows the police statement with a committed information rate (CIR) of 8000 bps, and all 140,091 packets have been counted as conforming, meaning they fell within the configured burst parameters and were transmitted; the exceeded and violated counters remain at zero, confirming no drops occurred. On the Cisco CCNP ENARSI 300-410 exam, this command tests your ability to verify CoPP effectiveness by distinguishing between conforming, exceeding, and violating actions—a common trap is assuming any policer with a CIR must be dropping traffic, but the drop counters must be checked. Remember the memory tip: "Conformed means transmitted, exceeded means dropped; if both exceeded and violated are zero, the policer is not yet throttling."
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
CoPP uses a policy-map applied to the control-plane service policy, where the class-default matches all traffic not matched by other classes. The police command implements a token bucket algorithm: conformed packets (within CIR) are transmitted, while exceeded and violated packets (above CIR) are dropped. In this case, the offered rate of 1000 bps is well below the CIR of 8000 bps, so all packets conform and none are dropped. Real-world scenarios often involve tuning CoPP to protect the control plane from DoS attacks while allowing legitimate traffic.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Device Management — This question tests Device Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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