- A
The CoPP policy is dropping all traffic due to a misconfigured CIR.
Why wrong: The CIR is set to 1 Mbps, but no packets have been dropped because none have matched the class.
- B
The CoPP policy is not matching any traffic, indicating a possible ACL or class-map misconfiguration.
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.
- C
The CoPP policy is working correctly and policing traffic at 1 Mbps.
Why wrong: While the policy is configured, no traffic has been processed, so it cannot be confirmed as working.
- D
The CoPP policy is only applied to the output direction.
Why wrong: The command specifies 'input', so it is applied to incoming traffic.
Question 2,119 of 2,152
Understanding CoPP Default Class Output with No Traffic Matched
This 300-410 practice question tests your understanding of control plane policing (copp). 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 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?
Quick Answer
The answer is that the CoPP policy is not matching any traffic, indicating a possible ACL or class-map misconfiguration. This output from the show policy-map control-plane input class class-default command reveals zero packets matched because the class-default is a catch-all class that should normally see at least some control plane traffic, such as routing protocol hellos or management packets. The 0 packets, 0 bytes and 0 bps rates confirm that the policy-map is effectively idle, meaning the classification logic—often tied to an access-list or class-map criteria—is failing to identify traffic as belonging to this class. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to interpret CoPP counters and troubleshoot why a policy is not applying; a common trap is assuming the policy is working when counters show zero, when in reality the ACL may be misordered or the class-map may use match-all instead of match-any. A useful memory tip is “zero packets, zero problem—check your ACL first.”
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.
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.
- ✗
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Trap categories for this question
Command / output trap
The command specifies 'input', so it is applied to incoming traffic.
Detailed technical explanation
How to think about this question
Control Plane Policing (CoPP) uses a class-map to match traffic destined to the control plane, often via an ACL that specifies protocols like SSH, BGP, or ICMP. If the ACL or class-map is misconfigured (e.g., wrong protocol, incorrect source/destination, or missing match statement), the class-default will capture all traffic but the policy will not apply the intended policing action, leading to zero matched packets in the specific class. In real-world scenarios, this can leave the control plane unprotected against DoS attacks, as the CoPP policy is effectively bypassed.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
Visual reference
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?
Control Plane Policing (CoPP) — This question tests Control Plane Policing (CoPP) — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
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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