hardMultiple ChoiceObjective-mapped
300-410 Practice Question: An engineer applies a Control Plane Policing…
An engineer applies a Control Plane Policing (CoPP) policy to a router. After applying, the router becomes unreachable via SSH and SNMP, even though the policy allows management traffic. 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 class-map for management traffic does not include all required protocols, and the class-default action is drop.
CoPP policies have an implicit deny at the end of the class-map. If the class-map for management traffic does not explicitly match all management protocols (e.g., SSH, SNMP, NTP), or if the policy does not have a class-default action to permit, the traffic is 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.
- ✗
The CoPP policy was applied to the wrong interface; it must be applied to the management interface.
Why it's wrong here
CoPP is applied to the control plane, not to interfaces.
- ✓
The class-map for management traffic does not include all required protocols, and the class-default action is drop.
Why this is correct
If class-default is not configured with a permit action, the implicit deny drops unmatched traffic, including management traffic not explicitly matched.
- ✗
The CoPP policy uses rate-limit in bps instead of pps, causing all traffic to be policed.
Why it's wrong here
Rate-limit units affect the policing rate but do not cause complete drop unless the rate is set to 0.
- ✗
The CoPP policy was applied before the class-maps were fully configured.
Why it's wrong here
The router would reject the policy if class-maps are missing; it would not apply partially.
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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.