- A
CoPP policies are applied using the Modular QoS CLI (MQC) and can be attached to the control-plane interface with the 'service-policy input' command.
Correct. CoPP uses MQC class-maps and policy-maps, and is applied under the control-plane configuration with 'service-policy input'.
- B
CoPP can be applied to the aggregate control plane or separately to the IPv4, IPv6, and MPLS control plane subinterfaces.
Correct. Cisco IOS supports applying CoPP to the aggregate control plane (control-plane) or to specific subinterfaces like control-plane [host | transit | cef-exception].
- C
CoPP policies are applied using the 'policy-map' command under the interface configuration mode for each physical interface.
Why wrong: Incorrect. CoPP is applied globally under the control-plane configuration, not per physical interface.
- D
CoPP polices all traffic that enters the router, including traffic that is process-switched after being forwarded.
Why wrong: Incorrect. CoPP only polices traffic destined to the control plane, not transit traffic or traffic that is process-switched after forwarding.
- E
CoPP uses the 'class-map' command to match traffic based on ACLs, NBAR, or DSCP values, and the 'police' command to enforce rate limits.
Why wrong: Incorrect. While CoPP does use class-maps and the police action, the statement is too generic and omits that CoPP specifically targets control plane traffic; the description is accurate for any MQC policy, but the question asks about CoPP behavior specifically.
Quick Answer
The correct answer is that CoPP can be applied to the aggregate control plane or separately to the IPv4, IPv6, and MPLS control plane subinterfaces. This is because Control Plane Policing uses Modular QoS CLI (MQC) to classify and rate-limit traffic destined to the router’s control plane, which is treated as a distinct logical entity. The `service-policy input` command is applied under the `control-plane` configuration, and you can target the aggregate plane or specific subinterfaces for granular protection. On the Cisco CCNP ENARSI 300-410 exam, this question tests your understanding that CoPP only polices traffic destined to the control plane itself—it does not affect process-switched traffic that is forwarded through the router. A common trap is assuming CoPP polices all traffic passing through the router, but it strictly protects the control plane from excessive CPU load. Memory tip: think "CoPP protects the brain, not the body"—it only polices traffic heading to the router’s CPU, not transit traffic.
300-410 Control Plane Policing (CoPP) Practice Question
This 300-410 practice question tests your understanding of control plane policing (copp). This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 statements correctly describe the behavior of Control Plane Policing (CoPP) when applied to a Cisco IOS router? (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
CoPP policies are applied using the Modular QoS CLI (MQC) and can be attached to the control-plane interface with the 'service-policy input' command.
CoPP uses MQC to classify and rate-limit traffic destined to the control plane. The control plane is a separate logical entity, and CoPP policies can be applied to the aggregate control plane or per-subinterface. The 'service-policy input' command is used under the control-plane configuration. CoPP does not affect traffic that is process-switched after being forwarded; it only polices traffic destined to the control plane itself.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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 policies are applied using the Modular QoS CLI (MQC) and can be attached to the control-plane interface with the 'service-policy input' command.
Why this is correct
Correct. CoPP uses MQC class-maps and policy-maps, and is applied under the control-plane configuration with 'service-policy input'.
Related concept
Authentication checks who the user is.
- ✓
CoPP can be applied to the aggregate control plane or separately to the IPv4, IPv6, and MPLS control plane subinterfaces.
Why this is correct
Correct. Cisco IOS supports applying CoPP to the aggregate control plane (control-plane) or to specific subinterfaces like control-plane [host | transit | cef-exception].
Related concept
Authentication checks who the user is.
- ✗
CoPP policies are applied using the 'policy-map' command under the interface configuration mode for each physical interface.
Why it's wrong here
Incorrect. CoPP is applied globally under the control-plane configuration, not per physical interface.
- ✗
CoPP polices all traffic that enters the router, including traffic that is process-switched after being forwarded.
Why it's wrong here
Incorrect. CoPP only polices traffic destined to the control plane, not transit traffic or traffic that is process-switched after forwarding.
- ✗
CoPP uses the 'class-map' command to match traffic based on ACLs, NBAR, or DSCP values, and the 'police' command to enforce rate limits.
Why it's wrong here
Incorrect. While CoPP does use class-maps and the police action, the statement is too generic and omits that CoPP specifically targets control plane traffic; the description is accurate for any MQC policy, but the question asks about CoPP behavior specifically.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 300-410 questions on access control and AAA configuration.
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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) — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: CoPP policies are applied using the Modular QoS CLI (MQC) and can be attached to the control-plane interface with the 'service-policy input' command. — CoPP uses MQC to classify and rate-limit traffic destined to the control plane. The control plane is a separate logical entity, and CoPP policies can be applied to the aggregate control plane or per-subinterface. The 'service-policy input' command is used under the control-plane configuration. CoPP does not affect traffic that is process-switched after being forwarded; it only polices traffic destined to the control plane itself.
What should I do if I get this 300-410 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 300-410 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
About these practice questions
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Last reviewed: Jun 18, 2026
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.
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