- A
The ACL matches OSPF, BGP, and LDP traffic, and all are rate-limited to 48000 bps.
Correct. The ACL permits OSPF (protocol 89), BGP (TCP 179), and LDP (UDP 646). The class-map matches all three and applies the 48000 bps policer.
- B
The ACL is missing 'permit eigrp any any' to include EIGRP traffic.
Why wrong: Incorrect. EIGRP is not required; the configuration is valid as is.
- C
The class-map must use 'match-all' to match all protocols simultaneously, but the ACL uses 'permit' which is OR logic, so the class-map will not work.
Why wrong: Incorrect. The ACL uses permit statements with OR logic; the class-map match-all means all match conditions must be met, but since there is only one match condition (the ACL), it works fine.
- D
The policy-map should be applied to the interface, not the control-plane.
Why wrong: Incorrect. CoPP is applied to the control-plane, not to interfaces. Interface-level policing would be different.
Quick Answer
The answer is that the ACL matches OSPF, BGP, and LDP traffic, and all are rate-limited to 48000 bps. This is correct because the access-list 101 explicitly permits OSPF (protocol 89), BGP (TCP port 179), and LDP (UDP port 646), and the class-map COPP-BGP matches all three protocols, applying a single policer of 48000 bps via the policy-map. On the Cisco CCNP ENARSI 300-410 exam, CoPP ACL configuration for OSPF, BGP, and LDP tests your ability to identify which control-plane protocols are being protected and whether the policing rate is appropriate; a common trap is assuming each protocol gets its own policer when they are grouped under one class. Remember that LDP uses UDP port 646, not TCP, and BGP uses TCP port 179—a quick memory tip is “BGP is TCP, LDP is UDP, OSPF is its own protocol number 89.”
300-410 Control Plane Policing (CoPP) Practice Question
This 300-410 practice question tests your understanding of control plane policing (copp). This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Analyze the following partial configuration:
access-list 101 permit tcp any any eq 179 access-list 101 permit udp any any eq 646 access-list 101 permit ospf any any
! class-map match-all COPP-BGP match access-group 101 ! policy-map COPP-POLICY
class COPP-BGP
police 48000 conform-action transmit exceed-action drop
class class-default
police 128000 conform-action transmit exceed-action drop !
interface GigabitEthernet0/0 ip address 192.168.1.1 255.255.255.0
! control-plane service-policy input COPP-POLICY
Which statement is true?
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 ACL matches OSPF, BGP, and LDP traffic, and all are rate-limited to 48000 bps.
The ACL includes OSPF, BGP (TCP port 179), and LDP (UDP port 646). These are all control-plane protocols. The policer rate of 48000 bps may be insufficient for BGP updates but the configuration is valid.
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 ACL matches OSPF, BGP, and LDP traffic, and all are rate-limited to 48000 bps.
- ✗
The ACL is missing 'permit eigrp any any' to include EIGRP traffic.
Why it's wrong here
Incorrect. EIGRP is not required; the configuration is valid as is.
- ✗
The class-map must use 'match-all' to match all protocols simultaneously, but the ACL uses 'permit' which is OR logic, so the class-map will not work.
Why it's wrong here
Incorrect. The ACL uses permit statements with OR logic; the class-map match-all means all match conditions must be met, but since there is only one match condition (the ACL), it works fine.
- ✗
The policy-map should be applied to the interface, not the control-plane.
Why it's wrong here
Incorrect. CoPP is applied to the control-plane, not to interfaces. Interface-level policing would be different.
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.
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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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 ACL matches OSPF, BGP, and LDP traffic, and all are rate-limited to 48000 bps. — The ACL includes OSPF, BGP (TCP port 179), and LDP (UDP port 646). These are all control-plane protocols. The policer rate of 48000 bps may be insufficient for BGP updates but the configuration is valid.
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
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