- A
The CoPP policy is dropping all ICMP packets to the control plane.
Why wrong: The CoPP-ICMP class shows 0 packets, so no ICMP traffic has been classified or dropped.
- B
The CoPP policy is not matching any packets for the CoPP-ICMP and CoPP-SSH classes.
The packet counters for both classes are zero, indicating no traffic matched these classes.
- C
The CoPP policy is rate-limiting SSH traffic to 16000 bps.
Why wrong: The CoPP-SSH class shows 0 packets, so no SSH traffic has been processed.
- D
The CoPP policy is applied to the output direction.
Why wrong: The output shows 'Service-policy input: CoPP-IN', indicating it is applied to the input direction.
Question 468 of 2,152
300-410 Control Plane Policing (CoPP) Practice Question
This 300-410 practice question tests your understanding of control plane policing (copp). Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 on Router R1:
R1# show policy-map control-plane
Control Plane
Service-policy input: CoPP-IN
Class-map: CoPP-ICMP (match-all) 0 packets, 0 bytes 5 minute offered rate 0000 bps, drop rate 0000 bps Match: access-group 100 police: cir 8000 bps, bc 1500 bytes, be 1500 bytes conformed 0 packets, 0 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop
Class-map: CoPP-SSH (match-all) 0 packets, 0 bytes 5 minute offered rate 0000 bps, drop rate 0000 bps Match: access-group 110 police: cir 16000 bps, bc 3000 bytes, be 3000 bytes conformed 0 packets, 0 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop
Class-map: class-default (match-any) 1250 packets, 75000 bytes 5 minute offered rate 1000 bps, drop rate 0000 bps Match: any
Based on this output, which statement is correct?
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 packets for the CoPP-ICMP and CoPP-SSH classes.
The output shows that the CoPP-ICMP and CoPP-SSH class-maps have zero packets matched (0 packets, 0 bytes), indicating that no traffic has been classified into these classes. This means the policy is not matching any ICMP or SSH packets, likely because the access-lists (100 and 110) are not correctly defined or applied, or the traffic is not reaching the control plane. Option B correctly identifies this lack of matching.
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 ICMP packets to the control plane.
Why it's wrong here
The CoPP-ICMP class shows 0 packets, so no ICMP traffic has been classified or dropped.
- ✓
The CoPP policy is not matching any packets for the CoPP-ICMP and CoPP-SSH classes.
Why this is correct
The packet counters for both classes are zero, indicating no traffic matched these classes.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The CoPP policy is rate-limiting SSH traffic to 16000 bps.
Why it's wrong here
The CoPP-SSH class shows 0 packets, so no SSH traffic has been processed.
- ✗
The CoPP policy is applied to the output direction.
Why it's wrong here
The output shows 'Service-policy input: CoPP-IN', indicating it is applied to the input direction.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between a configured policy and an active policy; candidates see police parameters and assume traffic is being policed, but the zero packet counters reveal that no classification is occurring, so the policy is effectively idle.
Trap categories for this question
Command / output trap
The CoPP-ICMP class shows 0 packets, so no ICMP traffic has been classified or dropped.
Detailed technical explanation
How to think about this question
Control Plane Policing (CoPP) uses class-maps with match statements (e.g., access-group) to classify traffic destined to the control plane. If the access-list does not match the actual traffic (e.g., wrong protocol, source/destination, or ACL order), the class-map will not accumulate packets, rendering the police action ineffective. In real-world scenarios, misconfigured ACLs are a common cause of CoPP failures, leading to either no protection or unintended drops.
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.
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 packets for the CoPP-ICMP and CoPP-SSH classes. — The output shows that the CoPP-ICMP and CoPP-SSH class-maps have zero packets matched (0 packets, 0 bytes), indicating that no traffic has been classified into these classes. This means the policy is not matching any ICMP or SSH packets, likely because the access-lists (100 and 110) are not correctly defined or applied, or the traffic is not reaching the control plane. Option B correctly identifies this lack of matching.
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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