Which three statements about RSTP are true? (Choose three.)
A.
RSTP significantly reduces topology reconverging time after a link failure.
B.
RSTP expands the STP port roles by adding the alternate and backup roles.
C.
RSTP port states are blocking, discarding, learning, or forwarding.
D.
RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.
E.
RSTP also uses the STP proposal-agreement sequence.
F.
RSTP uses the same timer-based process as STP on point-to-point links.
Explanation:
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml