The Per-Hop Behavior (PHB) defines the policy and priority applied to a packet when traversing a hop (such as a DS) in a DiffServ network.

Name: The Per-Hop Behavior (PHB) defines the policy and priority applied to a packet when traversing a hop (such as a DS) in a DiffServ network.
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The Per-Hop Behavior (PHB) in a Differentiated Services (DiffServ) network specifies the treatment packets receive at each network node, determining their forwarding priority and resource allocation.

The Per-Hop Behavior (PHB) Defines the Policy and Priority Applied