- A
OSPF packets are being dropped due to exceeding the police rate.
Why wrong: The exceeded and violated counters are zero.
- B
OSPF traffic is being transmitted without any drops.
All packets are conforming and being transmitted.
- C
The police rate is set to 32000 bps.
Why wrong: The CIR is 64000 bps.
- D
The class-default is matching OSPF traffic.
Why wrong: OSPF traffic is matched by the CoPP-OSPF class.
Question 1,011 of 2,152
300-410 Control Plane Policing (CoPP) Practice Question
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?
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
✓
OSPF traffic is being transmitted without any drops.
The output shows that under the CoPP-OSPF class, 1000 packets have been conformed and transmitted, with zero exceeded or violated packets. This means all OSPF traffic matched by access-group 140 has been within the police rate of 64000 bps, so no packets have been dropped. Therefore, OSPF traffic is being transmitted without any drops.
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.
- ✗
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
Read the scenario before looking for a memorised answer.
- ✗
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
Common exam trap: answer the scenario, not the keyword
Cisco often tests the interpretation of the 'conformed', 'exceeded', and 'violated' counters in police output, where candidates mistakenly assume that any policing configuration implies drops are occurring, even when the counters show zero drops.
Detailed technical explanation
How to think about this question
Control Plane Policing (CoPP) uses MQC (Modular QoS CLI) to apply a policy-map to the control plane, protecting the router's CPU from excessive traffic. The police command uses a single-rate three-color marker (srTCM) as per RFC 2697, where the committed information rate (CIR) is 64000 bps, and the committed burst (BC) and excess burst (BE) are both 12000 bytes; packets exceeding the CIR are marked as exceed or violate and dropped, but here all packets conformed. In real-world scenarios, CoPP is critical for preventing control plane overload from attacks like OSPF flooding, and the zero drop rate confirms the policy is not overly restrictive.
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
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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: OSPF traffic is being transmitted without any drops. — The output shows that under the CoPP-OSPF class, 1000 packets have been conformed and transmitted, with zero exceeded or violated packets. This means all OSPF traffic matched by access-group 140 has been within the police rate of 64000 bps, so no packets have been dropped. Therefore, OSPF traffic is being transmitted without any drops.
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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