Several varieties of spanning tree protocols have emerged since the original IEEE 802.1D.

The varieties of spanning tree protocols include:

A network professional, whose duties include switch administration, may be required to decide which type of spanning tree protocol to implement.

Note: The legacy Cisco-proprietary features UplinkFast and BackboneFast are not described in this course. These features are superseded by the implementation of Rapid PVST+, which incorporates these features as part of the implementation of the RSTP standard.