easyMultiple Choice
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-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?
⚠ Common exam trap
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.
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.
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 counters show 1000 conformed packets transmitted, with exceeded and violated both zero, so no OSPF packets are dropped. Drops would appear under exceeded or violated actions; the drop rate of 0000 bps confirms traffic is within the 64000 bps CIR.
- ✓
OSPF traffic is being transmitted without any drops.
Why this is correct
The CoPP-OSPF class shows 1000 conformed packets transmitted with zero exceeded and zero violated packets, and a drop rate of 0000 bps. OSPF traffic therefore passes the control-plane policer untouched, well within the 64000 bps committed rate.
- ✗
The police rate is set to 32000 bps.
Why it's wrong here
The police statement lists cir 64000 bps, not 32000 bps. The 32000 figure is tempting because it is half the configured rate, but the output explicitly states 64000 bps, with bc and be each 12000 bytes.
- ✗
The class-default is matching OSPF traffic.
Why it's wrong here
The output shows only the CoPP-OSPF class-map, matched via access-group 140; no class-default entry appears, so nothing indicates it matches OSPF. class-default matches traffic not matched by any other class, which would be the answer had the output listed it.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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