Which three statements about RSTP are true？（）A、RSTP significantly reduces topology reconverging time after a link failure.B、RSTP expends the STP port roles by adding the alternate and backup roles.C、RSTP port states are blocking，discarding，learing，or forwarding.D、RSTP also uses the STP proprsal-agreement sequence.E、RSTP use the same timer-baseed process as STP on point-to-point links.F、RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.
Which three statements about RSTP are true？（）
- A、RSTP significantly reduces topology reconverging time after a link failure.
- B、RSTP expends the STP port roles by adding the alternate and backup roles.
- C、RSTP port states are blocking，discarding，learing，or forwarding.
- D、RSTP also uses the STP proprsal-agreement sequence.
- E、RSTP use the same timer-baseed process as STP on point-to-point links.
- F、RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.
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