- A
The class-map uses match-any instead of match-all, which will cause incorrect matching.
Why wrong: Incorrect. Both match-any and match-all are valid; match-any is actually appropriate here if multiple protocols should be matched individually.
- B
The police rate of 32000 bps is too low for routing protocol traffic and may cause adjacency drops.
Why wrong: Incorrect. While the rate might be low, the primary issue is the use of match protocol.
- C
The 'match protocol' command is not supported in CoPP class-maps; only ACLs or DSCP/IP precedence can be used.
Correct. CoPP only supports match access-group, match ip dscp, or match ip precedence. match protocol is not allowed.
- D
The policy-map must be applied to the control-plane with the 'output' keyword instead of 'input'.
Why wrong: Incorrect. CoPP can be applied as input or output; input is correct for policing incoming control-plane traffic.
CoPP Match Protocol Limitation
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.
Consider the following CoPP configuration:
class-map match-any COPP-ROUTING match protocol ospf match protocol eigrp match protocol bgp ! policy-map COPP-POLICY
class COPP-ROUTING
police 32000 conform-action transmit exceed-action drop
class class-default
police 64000 conform-action transmit exceed-action drop ! control-plane service-policy input COPP-POLICY
What is a potential issue with this configuration?
Quick Answer
The answer is that the configuration is invalid because the match protocol command is not supported in CoPP class-maps, which creates a CoPP match protocol limitation. CoPP operates at the control plane level and can only classify traffic using Access Control Lists (ACLs) or DSCP/IP precedence values, not by protocol names like OSPF, EIGRP, or BGP. This means the policy-map will fail to correctly identify and police routing protocol traffic, leaving the control plane unprotected. On the Cisco CCNP ENARSI 300-410 exam, this tests your understanding of CoPP’s classification constraints—a common trap is assuming that match protocol works universally, when in fact it is only valid for QoS policies on data-plane interfaces. Remember the memory tip: “CoPP cops only ACLs and DSCP, not protocol names.”
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
The 'match protocol' command is not supported in CoPP class-maps; only ACLs or DSCP/IP precedence can be used.
Option C is correct because the 'match protocol' command is not supported in Control Plane Policing (CoPP) class-maps. CoPP operates on the control plane, which processes packets that are destined to the router itself; these packets are typically identified by ACLs, DSCP, or IP precedence values, not by protocol names like OSPF, EIGRP, or BGP. The 'match protocol' command is used in QoS policies applied to data-plane interfaces, not in control-plane service policies.
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.
- ✗
The class-map uses match-any instead of match-all, which will cause incorrect matching.
Why it's wrong here
Incorrect. Both match-any and match-all are valid; match-any is actually appropriate here if multiple protocols should be matched individually.
- ✗
The police rate of 32000 bps is too low for routing protocol traffic and may cause adjacency drops.
Why it's wrong here
Incorrect. While the rate might be low, the primary issue is the use of match protocol.
- ✓
The 'match protocol' command is not supported in CoPP class-maps; only ACLs or DSCP/IP precedence can be used.
Why this is correct
Correct. CoPP only supports match access-group, match ip dscp, or match ip precedence. match protocol is not allowed.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The policy-map must be applied to the control-plane with the 'output' keyword instead of 'input'.
Why it's wrong here
Incorrect. CoPP can be applied as input or output; input is correct for policing incoming control-plane traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that 'match protocol' can be used in CoPP class-maps because it is valid in data-plane QoS policies, but CoPP explicitly requires ACLs, DSCP, or IP precedence for classification.
Trap categories for this question
Command / output trap
Incorrect. CoPP can be applied as input or output; input is correct for policing incoming control-plane traffic.
Detailed technical explanation
How to think about this question
CoPP uses Modular QoS CLI (MQC) but restricts match criteria to those that can be evaluated on packets destined to the router's control plane, such as ACLs (matching IP, port, protocol fields), DSCP, or IP precedence. The 'match protocol' command relies on Network-Based Application Recognition (NBAR), which performs deep packet inspection on transit traffic and is not designed for control-plane packets that are already terminated locally. In real-world scenarios, you would use an ACL to match routing protocol packets by their IP protocol numbers (e.g., OSPF = 89, EIGRP = 88, BGP = TCP port 179) and apply that ACL in the CoPP class-map.
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 network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
Visual reference
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: The 'match protocol' command is not supported in CoPP class-maps; only ACLs or DSCP/IP precedence can be used. — Option C is correct because the 'match protocol' command is not supported in Control Plane Policing (CoPP) class-maps. CoPP operates on the control plane, which processes packets that are destined to the router itself; these packets are typically identified by ACLs, DSCP, or IP precedence values, not by protocol names like OSPF, EIGRP, or BGP. The 'match protocol' command is used in QoS policies applied to data-plane interfaces, not in control-plane service policies.
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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