hardMultiple ChoiceObjective-mapped
300-410 Practice Question: CoPP (Control Plane Policing) rate-limit impacts…
CoPP (Control Plane Policing) rate-limit impacts legitimate traffic. Router R1 has CoPP policy applied: 'class-map match-all BGP class-map match-all SSH match protocol bgp match protocol ssh policy-map COPP class BGP police 10000 conform-action transmit exceed-action drop'. Network engineers cannot SSH to R1, but BGP sessions are stable. 'show policy-map control-plane' output shows 'BGP class: 0 packets, 0 bytes' and 'SSH class: 0 packets, 0 bytes'. What is the root cause?
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 class-map uses 'match-all' instead of 'match-any', causing SSH traffic not to match the class and be dropped by default action.
The class-map uses 'match protocol bgp' and 'match protocol ssh' with match-all, meaning both conditions must be true for a packet to match. SSH packets do not match protocol bgp, so they fall through to the default class, which may have a drop policy. The class-map should be match-any or separate classes for each protocol.
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 class-map uses 'match-all' instead of 'match-any', causing SSH traffic not to match the class and be dropped by default action.
Why this is correct
With match-all, a packet must be both BGP and SSH, which is impossible; SSH packets go to default class, likely drop.
- ✗
The police rate is too low for SSH traffic; need to increase.
Why it's wrong here
No packets matched, so rate is irrelevant.
- ✗
ACL on the interface blocks SSH before CoPP is applied.
Why it's wrong here
No ACL mentioned.
- ✗
CoPP is applied to the wrong direction; should be input.
Why it's wrong here
CoPP is typically applied to control-plane input.
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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.