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300-410 Practice Question: Which TWO statements correctly describe the…
Which TWO statements correctly describe the behavior of Control Plane Policing (CoPP) when applied to a Cisco IOS router? (Choose TWO.)
⚠ Common exam trap
Cisco often tests the distinction between CoPP applying to the control plane (CPU-bound traffic) versus applying to all traffic entering the router, and the trap here is that candidates mistakenly think CoPP polices all forwarded traffic, when it only polices traffic destined to the control plane.
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 the Modular QoS CLI (MQC) framework, where a policy-map is created with class-maps and actions, and then applied to the control-plane interface using the 'service-policy input' command. This attaches the policy to the control plane, filtering traffic destined to the router's CPU before it is process-switched.
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'.
- ✓
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].
- ✗
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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