it network assessment

How it network assessment traffic is separated, where it is policed, and why are important questions to keep in mind in the overall network QoS design. It is not productive, for example, to police DSCP EF (typically voice) traffic or call-signaling traffic because the incoming rates of these traffic types do not tolerate packet loss and delay. Instead, the maximum rates of these traffic types should be controlled at their origin by call admission control mechanisms

Re-marking packets with a policer should be done with care, keeping in mind the overall policies of the network. Packets typically are marked as close to the source as technically and administratively feasible (either at the source itself, if trusted, or at a network trust boundary). In these locations, the traffic typically is marked by application: voice, call signaling, video, high-priority data, and so on. This can be thought of as a vertical separation of it network assessment traffic