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300-410 Practice Question: Which TWO statements about Control Plane Policing…
Which TWO statements about Control Plane Policing (CoPP) are true? (Choose TWO.)
⚠ Common exam trap
Cisco often tests the misconception that CoPP is applied to physical interfaces (like an ACL) rather than to the control plane itself, and that it operates at Layer 2, when in fact it uses MQC for Layer 3/4 classification and is configured under the 'control-plane' global configuration mode.
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 uses Modular QoS CLI (MQC) to define traffic classes and actions.
Control Plane Policing (CoPP) uses the Modular QoS CLI (MQC) to classify traffic into classes (e.g., routing protocol packets, management traffic) and apply actions such as rate-limiting or dropping. MQC provides a flexible, policy-based framework that allows you to define traffic classes with class maps and attach service policies to the control plane, rather than to physical interfaces.
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 uses Modular QoS CLI (MQC) to define traffic classes and actions.
Why this is correct
CoPP relies on MQC with class maps to match traffic and policy maps to define policing actions.
- ✗
CoPP is applied directly to physical interfaces to protect the control plane.
Why it's wrong here
CoPP is applied globally to the control plane using the 'service-policy input' command under 'control-plane', not to individual interfaces.
- ✓
CoPP can be used to rate-limit traffic destined to the CPU, such as routing protocol packets or management traffic.
Why this is correct
CoPP is designed to police traffic that is processed by the route processor, including OSPF, BGP, SSH, and SNMP.
- ✗
CoPP operates at Layer 2 to filter Ethernet frames before they reach the CPU.
Why it's wrong here
CoPP operates at Layer 3 and above, classifying packets based on IP headers and upper-layer information, not Ethernet frames.
- ✗
CoPP replaces the need for access control lists (ACLs) on the device.
Why it's wrong here
CoPP complements ACLs but does not replace them; ACLs are often used within class maps for CoPP classification.
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.