A network engineer has the duty of protecting a network from external or internal attacks that wants to compromise the integrity of the network.
This refers to one of the ways of protecting the control plane by policing the traffic coming into it.
The use of control plane policing is the feature that Bruno is making use of as he wants messages with a bps (bits per second) rate below the threshold of 7000 to be transmitted and the messages with a threshold above 7000 to be dropped.
Please note that your question is incomplete so I gave you a general overview to help you get a better understanding of the concept.
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