A.255.255.255.0 B.255.255.255.192 C.255.255.255.250 D.255.255.255.252
A.RSTP cannot operate with PVST+. B.RSTP defines new port roles. C.RSTP defines no new port states. D.RSTP is a proprietary implementation of IEEE 802.1D STP. E.RSTP is compatible with the original IEEE 802.1D STP.
A.redundant B.spanned C.provisioned D.converged