Purpose of Traffic Policing

C

The purpose of traffic policing is to control the rate of traffic traversing a particular interface by dropping or remarking packets that exceed a configured rate limit, called the Committed Information Rate (CIR).

Option A is incorrect because traffic policing is not designed to prioritize routing protocol traffic. Routing protocols usually use their own mechanisms for ensuring their traffic gets priority over other types of traffic.

Option B is partially correct, but incomplete. Traffic that is below the CIR is not typically remarked by traffic policing; instead, it is simply allowed to pass through without modification.

Option C is correct. When traffic exceeds the CIR, traffic policing can be configured to drop the excess traffic, which helps prevent congestion and ensures that the network resources are allocated fairly among all traffic flows.

Option D is incorrect because traffic policing does not queue traffic that exceeds the CIR. Instead, the excess traffic is typically dropped or remarked based on the specific configuration. Queuing is typically associated with traffic shaping, which is a separate traffic control mechanism used to smooth out bursty traffic and maintain a desired output rate.

In summary, the purpose of traffic policing is to limit the rate of traffic traversing a particular interface by dropping or remarking packets that exceed a configured rate limit, called the Committed Information Rate (CIR).