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.