- 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.
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.”
300-410 Control Plane Policing (CoPP) Practice Question
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?
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.
Using match protocol in a class-map for CoPP is not supported; CoPP only matches on ACLs or DSCP/IP precedence. The policy will not classify routing protocol traffic correctly.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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.
- ✗
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: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
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
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
- OSPF neighbours must agree on key parameters.
- Router ID selection can affect neighbour relationships and LSDB output.
- OSPF cost influences the preferred path.
- A route can appear in OSPF information but not become the installed route.
TExam Day Tips
- Check area mismatch first when OSPF adjacency fails.
- Review passive interfaces when a network is advertised but no neighbour forms.
- Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
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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) — OSPF neighbours must agree on key parameters..
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. — Using match protocol in a class-map for CoPP is not supported; CoPP only matches on ACLs or DSCP/IP precedence. The policy will not classify routing protocol traffic correctly.
What should I do if I get this 300-410 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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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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