When a bridge port receives the best BPDU, what role does it assume?

When a bridge port receives the best BPDU (Bridge Protocol Data Unit), it means that port has learned the most optimal path to the root bridge. Consequently, that port assumes the role of the root port. The root port is the single port on a non-root bridge that has the lowest cost path to the root bridge. The designated port is the port on a segment that has the lowest cost path to the root bridge for that specific segment. The backup port is an alternative to a designated port on a segment, blocking traffic. The alternate port is a port that has an alternative path to the root bridge but is currently blocking.