- A
show policy-map control-plane
This command displays packet counters for each class in the CoPP policy, including dropped (violate) packets.
- B
debug policy-map control-plane
Why wrong: This is not a valid Cisco IOS command; the correct debug is 'debug policy-map' but it is not specific to control plane and can be disruptive.
- C
show control-plane host open-ports
This command shows which class map is associated with each open control plane port, helping verify CoPP classification.
- D
show ip cache flow
Why wrong: This command displays NetFlow statistics for data plane traffic, not control plane policing drops.
- E
show access-lists
Why wrong: This command shows ACL match counts but does not provide CoPP-specific drop information or policy statistics.
Question 1,365 of 2,152
300-410 Control Plane Policing (CoPP) Practice Question
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.
Which TWO commands are used to troubleshoot Control Plane Policing (CoPP) and identify which traffic is being dropped? (Choose TWO.)
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
✓
show policy-map control-plane
The 'show policy-map control-plane' command displays the applied policy map on the control plane, including class maps, match criteria, and per-class statistics such as the number of packets matched and dropped. This allows you to verify which traffic is being classified and confirm that CoPP is dropping the intended packets. It is the primary verification command for CoPP.
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.
- ✓
show policy-map control-plane
Why this is correct
This command displays packet counters for each class in the CoPP policy, including dropped (violate) packets.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
debug policy-map control-plane
Why it's wrong here
This is not a valid Cisco IOS command; the correct debug is 'debug policy-map' but it is not specific to control plane and can be disruptive.
- ✓
show control-plane host open-ports
Why this is correct
This command shows which class map is associated with each open control plane port, helping verify CoPP classification.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
show ip cache flow
Why it's wrong here
This command displays NetFlow statistics for data plane traffic, not control plane policing drops.
- ✗
show access-lists
Why it's wrong here
This command shows ACL match counts but does not provide CoPP-specific drop information or policy statistics.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between commands that show CoPP configuration versus those that show actual drop statistics; the trap here is that candidates might think 'show access-lists' is sufficient because ACLs are used in class maps, but it does not show the policy-map actions or control-plane-specific drop counters.
Trap categories for this question
Command / output trap
This is not a valid Cisco IOS command; the correct debug is 'debug policy-map' but it is not specific to control plane and can be disruptive.
Detailed technical explanation
How to think about this question
CoPP uses a control-plane service policy that references a policy-map with class maps matching control-plane traffic (e.g., routing protocols, management traffic) and actions like 'drop' or 'police'. The 'show policy-map control-plane' command reveals the actual packet counters for each class, including 'dropped' packets, which is essential for verifying that the policer is enforcing the configured rate. In real-world scenarios, a common issue is that CoPP may drop legitimate traffic like BGP keepalives if the policer rate is too low, and this command helps identify such drops by showing per-class drop counts.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Control Plane Policing (CoPP) — study guide chapter
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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: show policy-map control-plane — The 'show policy-map control-plane' command displays the applied policy map on the control plane, including class maps, match criteria, and per-class statistics such as the number of packets matched and dropped. This allows you to verify which traffic is being classified and confirm that CoPP is dropping the intended packets. It is the primary verification command for CoPP.
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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