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Question

Which statements about RSTP are true?

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 non-broadcast links.

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Accepted Answer

RSTP significantly reduces topology reconverging time after a link failure.

Accepted Answer

RSTP expands the STP port roles by adding the alternate and backup roles.

Accepted Answer

RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.

Accepted Answer

Rapid transition is the most important feature introduced by 802.1w. The legacy STA passively waited for the network to converge before it turned a port into the forwarding state. The achievement of faster convergence was a matter of tuning the conservative default parameters (forward delay and max_age timers) and often put the stability of the network at stake. The new rapid STP is able to actively confirm that a port can safely transition to the forwarding state without having to rely on any timer configuration. There is now a real feedback mechanism that takes place between RSTP-compliant bridges. In order to achieve fast convergence on a port, the protocol relies upon two new variables: edge ports and link type.