A.VTP messages will not be forwarded over nontrunk links.
B.VTP domain names need to be identical. However，case doesn’t matter.
C.A VTP enabled device which receives multiple advertisements will ignore advertisements with higher configuration revision numbers.
D.A device in "transparent" VTP v.1 mode will not forward VTP messages.
E.VTP pruning allows switches to prune VLANs that do not have any active ports associated with  them.

A.Supports Token Ring VLANs.
B.Allows VLAN consistency checks.
C.Saves VLAN configuration memory.
D.Reduces the amount of configuration necessary.
E.Allows active redundant links when used with spanning tree.