350-401 · Question #692
350-401 Question #692: Real Exam Question with Answer & Explanation
The correct answer is D: It applies to packets that are punted to the route processor.. Control Plane Policing (CoPP) Explained Why D is Correct: Control Plane Policing (CoPP) is specifically designed to protect the Route Processor (RP) by rate-limiting or filtering traffic that is punted (redirected) to it - such as routing protocol updates, management traffic, and
Question
Which statement about Control Plane Policing is true?
Options
- AIt queues egress packets that would otherwise be discarde
- BIt applies to packets that are generated locally.
- CIt queues ingress packets that would otherwise be discarde
- DIt applies to packets that are punted to the route processor.
Explanation
Control Plane Policing (CoPP) Explained
Why D is Correct: Control Plane Policing (CoPP) is specifically designed to protect the Route Processor (RP) by rate-limiting or filtering traffic that is punted (redirected) to it - such as routing protocol updates, management traffic, and exception packets. CoPP acts as a traffic cop for the control plane, ensuring the RP isn't overwhelmed by legitimate or malicious traffic.
Why the Distractors Are Wrong:
- A & C are incorrect because CoPP does not queue packets - it polices (rate-limits or drops) them using a policy-map. Queuing is a QoS function, not a CoPP function.
- B is incorrect because CoPP applies to traffic destined for the route processor (punted traffic), not to locally generated packets leaving the device (that would fall under other policy mechanisms).
Memory Tip: Think of CoPP as a bouncer protecting the RP's door - it only controls who gets punted up to the control plane. The key word to remember is "punted": any packet punted to the route processor is subject to CoPP policies. If you see "queuing" in an answer choice about CoPP, it's almost certainly wrong.
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