This 300-410 practice question tests your understanding of control plane policing (copp). Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
A network engineer runs the following command on Router R1:
R1# show policy-map control-plane
Control Plane
Service-policy input: CoPP-IN
Class-map: CoPP-OSPF (match-all) 1000 packets, 60000 bytes 5 minute offered rate 2000 bps, drop rate 0000 bps Match: access-group 140 police: cir 64000 bps, bc 12000 bytes, be 12000 bytes conformed 1000 packets, 60000 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop
Based on this output, which statement is correct?
OSPF packets are being dropped due to exceeding the police rate.
Why wrong: The exceeded and violated counters are zero.
OSPF traffic is being transmitted without any drops.
All packets are conforming and being transmitted.
The police rate is set to 32000 bps.
Why wrong: The CIR is 64000 bps.
The class-default is matching OSPF traffic.
Why wrong: OSPF traffic is matched by the CoPP-OSPF class.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
OSPF traffic is being transmitted without any drops.
The CoPP-OSPF class is matching OSPF traffic and all packets are conforming to the police rate, so no drops are occurring. This indicates that OSPF traffic is being properly rate-limited without any packet loss.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
OSPF packets are being dropped due to exceeding the police rate.
Why it's wrong here
The exceeded and violated counters are zero.
OSPF traffic is being transmitted without any drops.
Why this is correct
All packets are conforming and being transmitted.
Related concept
OSPF neighbours must agree on key parameters.
The police rate is set to 32000 bps.
Why it's wrong here
The CIR is 64000 bps.
The class-default is matching OSPF traffic.
Why it's wrong here
OSPF traffic is matched by the CoPP-OSPF class.
Common exam traps
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
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.
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
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
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
Control Plane Policing (CoPP) — This question tests Control Plane Policing (CoPP) — OSPF neighbours must agree on key parameters..
The correct answer is: OSPF traffic is being transmitted without any drops. — The CoPP-OSPF class is matching OSPF traffic and all packets are conforming to the police rate, so no drops are occurring. This indicates that OSPF traffic is being properly rate-limited without any packet loss.
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.
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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