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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 fails.
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