mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
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-DEFAULT (match-any) 5000 packets, 300000 bytes 5 minute offered rate 4000 bps, drop rate 2000 bps Match: any police: cir 32000 bps, bc 6000 bytes, be 6000 bytes conformed 3000 packets, 180000 bytes; actions: transmit exceeded 1000 packets, 60000 bytes; actions: drop violated 1000 packets, 60000 bytes; actions: drop
Based on this output, what is the most likely impact on the router?
⚠ Common exam trap
Cisco often tests the misinterpretation of the 'police' counters: candidates may see 'conformed' packets and assume no drops, missing the 'exceeded' and 'violated' counters that clearly indicate dropped traffic.
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
✓
Some control plane traffic is being dropped, which could cause routing protocol instability.
The output shows that the CoPP policy is policing control plane traffic with a CIR of 32000 bps. The 'exceeded' and 'violated' counters indicate that 2000 packets (120000 bytes) have been dropped, with a drop rate of 2000 bps. This means some control plane traffic is being dropped, which can cause routing protocol instability (e.g., BGP, OSPF keepalives being dropped).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
All control plane traffic is being transmitted without issues.
Why it's wrong here
The drop rate is 2000 bps, indicating packet loss.
- ✓
Some control plane traffic is being dropped, which could cause routing protocol instability.
Why this is correct
Dropped packets in the class-default can affect critical control plane traffic.
- ✗
The police rate is set to 64000 bps.
Why it's wrong here
The CIR is 32000 bps.
- ✗
Only ICMP traffic is being dropped.
Why it's wrong here
The class-default matches any traffic, not just ICMP.
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.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.