Which design benefit of bridge assurance is true?

Bridge Assurance is a mechanism used with Rapid PVST+ and MST that helps prevent loops caused by unidirectional failures on point-to-point links. When enabled, both ends of a point-to-point STP link must continuously exchange BPDUs. If one side stops receiving BPDUs, the port transitions into a blocking state, preventing loops caused by silent failures.

This directly addresses unidirectional link failures that otherwise may not be detected quickly by traditional STP timers.

It is typically deployed between switches in the core and distribution layers, where point-to-point links exist.

Other options explained:

A: Incorrect — STP TCNs are not triggered simply by station connection events.

B: Incorrect — Path optimization is handled by STP/RSTP convergence, not bridge assurance directly.

C: Incorrect — Bridge assurance is not designed for unmanaged switches at the access layer.

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