Final answer:
A designated port is a non-root port in an STP network that is permitted to forward traffic.
Step-by-step explanation:
In a Spanning Tree Protocol (STP) network, a non-root port that is permitted to forward traffic is called a designated port. The designated port is a port on a switch that is selected to forward traffic for a specific segment in the network. It is chosen based on its lowest path cost to the root bridge in the network.