Which option describes the purpose of traffic policing?

Question:
Which option describes the purpose of traffic policing?

• It prioritizes routing protocol traffic.
• It remarks traffic that is below the CIR
• It drops traffic that exceeds the CIR.
• It queues and then transmits traffic that exceeds the CIR.

Explanation: The following diagram illustrates the key difference between traffic policing and traffic shaping. Traffic policing propagates bursts. When the traffic rate reaches the configured maximum rate (or committed information rate), excess traffic is dropped (or remarked). The result is an output rate that appears as a saw-tooth with crests and troughs. In contrast to policing, traffic shaping retains excess packets in a queue and then schedules the excess for later transmission over increments of time. The result of traffic shaping is a smoothed packet output rate.

Note: Committed information rate (CIR): The minimum guaranteed data transfer rate agreed to by the routing device.

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