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.

A. 32768： 11-22-33-44-55-66
B. 32768： 22-33-44-55-66-77
C. 32769： 11-22-33-44-55-65
D. 32769： 22-33-44-55-66-78

A.PSK
B.AH
C.MD5
D.ESP

A. 802.1d
B. VTP
C. 802.1q
D. STP
E. SAP

A.telnet access does not require a password
B.nat
C.no broadcast
D.chanage of destination address in the ipv6 header
E.chanage of source address in the ipv6 header
F.autoconfiguration