mediumMultiple Choice
300-410 Practice Question: The default CoPP behavior for traffic that does…
What is the default CoPP behavior for traffic that does not match any class in the policy-map?
⚠ Common exam trap
Cisco often tests the misconception that CoPP drops all unmatched traffic by default, similar to how ACLs have an implicit deny at the end, but CoPP's class-default actually permits traffic unless explicitly configured to drop.
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
✓
Transmitted
By default, Control Plane Policing (CoPP) uses a class-default in the policy-map that implicitly permits (transmits) all traffic not explicitly matched by a user-defined class. This default behavior ensures that only traffic matching a class with a 'drop' action is policed, preventing unintentional denial of service from misconfigured policies.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Dropped
Why it's wrong here
Unmatched traffic is not dropped by default; CoPP permits it, since only explicitly classified traffic is policed. Dropping is tempting because CoPP exists to protect the control plane, but that protection applies solely to classes defined in the policy-map, with all other traffic passing unrestricted.
- ✓
Transmitted
Why this is correct
Cisco's Control Plane Policing default class treats unmatched traffic as conforming, so packets are forwarded rather than dropped. This satisfies the stem because the policy-map only polices explicitly classified classes, leaving all other control-plane traffic transmitted by default.
- ✗
Logged and dropped
Why it's wrong here
Unmatched traffic is permitted, not logged and dropped; CoPP applies actions only to classes defined in the policy-map. Logging and dropping is tempting because CoPP polices control-plane traffic, but that treatment applies to matched classes, not to traffic falling outside every class.
- ✗
Routed to the management plane
Why it's wrong here
Unmatched traffic is not redirected to the management plane; it is permitted through normal forwarding, as CoPP only polices explicitly classified traffic. Management-plane routing is tempting because CoPP protects that plane, but redirection is not its default action for unclassified packets.
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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.