C and D Compared to Spanning Tree Protocol (STP), Rapid Spanning Tree Protocol (RSTP) introduces two additional port roles: Alternate Port: This port receives BPDUs (Bridge Protocol Data Units) from its own switch but remains in a blocked state unless the designated port fails. In STP, there's no equivalent role, and only blocked ports receive BPDUs from other switches. Backup Port: This port receives BPDUs from other switches but remains in a blocked state unless both the root port and designated port fail. This also doesn't have a direct equivalent in STP, offering an extra layer of redundancy.

Respuesta C y D Alternate Port: This is a new role introduced in RSTP. An alternate port is one that provides an alternative path to the root switch, different from the path that the root port takes. It's in a blocking state but can transition to forwarding quickly if the network topology changes and the primary path (via the root port) fails. Backup Port: This is another new role introduced in RSTP. A backup port provides a redundant (backup) path to a segment where another switch port already connects. This port is also in a blocking state, and will only become active if the designated port for that segment

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Alternate port already exists in STP. The new port roles are Backup port and Edge Port.

A correta é (C)