The role of the root port in a switched network is:
C. It is the best path to the root from a nonroot switch.
In the context of the Spanning Tree Protocol (STP), each nonroot bridge (switch) must have one root port. The root port is the port on the nonroot switch with the lowest path cost to the root bridge (the selected root switch in the network). The root port is always the one port that has the best path (lowest cost) to reach the root bridge, which helps prevent loops in the network by creating a tree-like structure.
Root port - The root port is always the link connected to the root bridge, or the shortest path to the root bridge.
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