Which statement about Control Plane Policing is true?

A.
Control Plane Policing allows QoS filtering to protect the control plane against DoS attacks.

B.
Control Plane Policing classifies traffic into three categories to intercept malicious traffic.

C.
Control Plane Policing allows ACL-based filtering to protect the control plane against DoS
attacks.

D.
Control Plane Policing intercepts and classifies all traffic.

Explanation:
The Control Plane Policing feature allows you to configure a quality of service (QoS) filter that
manages the traffic flow of control plane packets to protect the control plane of routers and
switches against reconnaissance and denial-of-service (DoS) attacks. In this way, the control
plane (CP) can help maintain packet forwarding and protocol states despite an attack or heavy
traffic load on the router or switch.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_plcshp/configuration/xe-
3s/asr1000/qos-plcshp-xe-3s-asr-1000-book/qos-plcshp-ctrl-pln-plc.html