hardMultiple ChoiceObjective-mapped
300-410 Practice Question: An engineer configures Control Plane Policing…
An engineer configures Control Plane Policing (CoPP) with a policy map that includes a class-map matching BGP traffic. The policy map has a 'police' action that sets the rate-limit in bps. After applying the policy to the control plane, BGP sessions start flapping. Which is the most likely explanation?
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
✓
The police rate is configured in bps, but BGP keepalives are small packets; pps should be used to avoid dropping.
CoPP rate-limits are often configured in bps by default, but for control plane traffic, pps (packets per second) is more appropriate. If the rate-limit is set in bps, it may be too low for BGP keepalive packets, which are small. The edge case is that the engineer used bps instead of pps, causing the policer to drop BGP packets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The police rate is configured in bps, but BGP keepalives are small packets; pps should be used to avoid dropping.
Why this is correct
bps rate-limit can drop many small packets; pps is recommended for control plane traffic.
- ✗
The class-map matches BGP traffic incorrectly; it should match on protocol BGP.
Why it's wrong here
Class-maps can match on protocol; the issue is rate unit.
- ✗
The policy map is applied to the control plane inbound, but BGP packets are sent outbound.
Why it's wrong here
BGP uses TCP, which is bidirectional; inbound policing affects received packets.
- ✗
The default class is not configured, causing all other traffic to be dropped.
Why it's wrong here
Default class does not affect BGP if it is matched in a specific class.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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