- A
EIGRP packets are being dropped, causing neighbor flapping.
Why wrong: The drop counters are zero and the neighbor is up.
- B
EIGRP traffic is being rate-limited but no packets are dropped.
All packets are conforming and transmitted.
- C
The police rate is set to 8000 bps.
Why wrong: The CIR is 16000 bps.
- D
The EIGRP neighbor is not established.
Why wrong: The show command shows an established neighbor.
Question 1,357 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-EIGRP (match-all) 200 packets, 12000 bytes 5 minute offered rate 1000 bps, drop rate 0000 bps Match: access-group 150 police: cir 16000 bps, bc 3000 bytes, be 3000 bytes conformed 200 packets, 12000 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop
R1# show ip eigrp neighbors
EIGRP-IPv4 neighbors for process 100 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 0 10.1.1.2 Gi0/0 13 00:10:00 1 200 0 5
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
✓
EIGRP traffic is being rate-limited but no packets are dropped.
The output shows that the CoPP policy 'CoPP-IN' matches EIGRP packets (via access-group 150) and applies a police rate of 16,000 bps. The 'conformed' counter shows 200 packets transmitted, while 'exceeded' and 'violated' counters are zero, indicating no packets have been dropped. The 'show ip eigrp neighbors' output confirms the neighbor is established with an uptime of 10 minutes, so EIGRP traffic is being rate-limited but not dropped, making option B correct.
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.
- ✗
EIGRP packets are being dropped, causing neighbor flapping.
Why it's wrong here
The drop counters are zero and the neighbor is up.
- ✓
EIGRP traffic is being rate-limited but no packets are dropped.
Why this is correct
All packets are conforming and transmitted.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The police rate is set to 8000 bps.
Why it's wrong here
The CIR is 16000 bps.
- ✗
The EIGRP neighbor is not established.
Why it's wrong here
The show command shows an established neighbor.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a police rate being applied automatically means packets are being dropped, but the key is to check the actual packet counters (conformed/exceeded/violated) to determine if drops have occurred.
Trap categories for this question
Command / output trap
The show command shows an established neighbor.
Detailed technical explanation
How to think about this question
CoPP uses a single-rate two-color policer by default (with conform and exceed actions), but the output shows three counters (conformed, exceeded, violated) indicating a single-rate three-color policer (srTCM) with bc and be values. The 'be 3000 bytes' allows a burst that can absorb short traffic spikes without dropping, which is why no packets have exceeded the CIR. In real-world scenarios, CoPP is critical for protecting the control plane from DoS attacks while ensuring critical protocols like EIGRP are not starved.
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.
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: EIGRP traffic is being rate-limited but no packets are dropped. — The output shows that the CoPP policy 'CoPP-IN' matches EIGRP packets (via access-group 150) and applies a police rate of 16,000 bps. The 'conformed' counter shows 200 packets transmitted, while 'exceeded' and 'violated' counters are zero, indicating no packets have been dropped. The 'show ip eigrp neighbors' output confirms the neighbor is established with an uptime of 10 minutes, so EIGRP traffic is being rate-limited but not dropped, making option B correct.
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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