- A
CoPP uses Modular QoS CLI (MQC) to define traffic classes and actions.
CoPP relies on MQC with class maps to match traffic and policy maps to define policing actions.
- B
CoPP is applied directly to physical interfaces to protect the control plane.
Why wrong: CoPP is applied globally to the control plane using the 'service-policy input' command under 'control-plane', not to individual interfaces.
- C
CoPP can be used to rate-limit traffic destined to the CPU, such as routing protocol packets or management traffic.
CoPP is designed to police traffic that is processed by the route processor, including OSPF, BGP, SSH, and SNMP.
- D
CoPP operates at Layer 2 to filter Ethernet frames before they reach the CPU.
Why wrong: CoPP operates at Layer 3 and above, classifying packets based on IP headers and upper-layer information, not Ethernet frames.
- E
CoPP replaces the need for access control lists (ACLs) on the device.
Why wrong: CoPP complements ACLs but does not replace them; ACLs are often used within class maps for CoPP classification.
Control Plane Policing (CoPP) Fundamentals
This 300-410 practice question tests your understanding of control plane policing (copp). Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 about Control Plane Policing (CoPP) are true? (Choose TWO.)
Quick Answer
The answer is that CoPP can be used to rate-limit traffic destined to the CPU, such as routing protocol packets or management traffic. This is correct because Control Plane Policing (CoPP) applies a Modular QoS CLI (MQC) service policy directly to the control plane, classifying packets like OSPF hellos or SSH and policing them to protect the CPU from overload. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of control plane protection mechanisms, often appearing in a “choose two” format where one distractor suggests CoPP is applied to interfaces—a common trap. Remember, CoPP works at Layer 3 and above, not Layer 2, and it complements ACLs rather than replacing them. A helpful memory tip: think of CoPP as a “CPU bouncer” that checks ID (classifies) and limits entry (polices) at the control plane door, not at the interface gate.
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.
Option A is correct because 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.
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.
- ✓
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Trap categories for this question
Command / output trap
CoPP is applied globally to the control plane using the 'service-policy input' command under 'control-plane', not to individual interfaces.
Detailed technical explanation
How to think about this question
Under the hood, CoPP leverages the CPU's internal receive ring and policer hardware to enforce rate limits on traffic destined to the route processor. For example, you can protect OSPF hello packets (protocol 89) by creating a class map that matches an ACL for OSPF traffic, then applying a police action to limit the rate to 100 kbps, preventing a DoS attack from overwhelming the CPU while still allowing legitimate protocol exchanges. A subtle behavior is that CoPP policies are processed in the control plane path, meaning they only affect packets that are punted to the CPU, not those switched in hardware.
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.
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.
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: CoPP uses Modular QoS CLI (MQC) to define traffic classes and actions. — Option A is correct because 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.
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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