A.Memory  requirements are higher for shared distribution tree than for source distributiontree.
B.Creates a tree from a central RP to all last-hoprouters.
C.Uses a rendezvous point.
D.An optimal path is created between each source router and each last-hoprouter.
E.Place（S，G）entry in each router’smulticast routing table.
F.Place（*，G）entry in a router’smulticast routing to table.