In Rapid PVST+, what is the mode and role of a backup port on a shared LAN segment?
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Correct answer: blocking mode and provides an alternate path toward the designated bridge.
Why this is the answer
A backup port in Rapid PVST+ (RSTP) operates in blocking mode. Its purpose is to provide an alternate, redundant path to the designated bridge on a shared LAN segment if the primary designated port fails. It does not forward user traffic to prevent loops. Incorrect options: learning mode: Learning mode is a transitional state before forwarding; a backup port remains in blocking mode. It doesn't handle traffic away from the LAN; it's part of the LAN segment. forwarding mode: Forwarding mode is for active, loop-free paths. A backup port is explicitly blocked to prevent loops. listening mode: Listening mode is an older STP state not directly used in RSTP for backup ports.
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