IP multicastingisasetoftechnologiesthatenableefficientdeliveryof datatomanylocationsonanetwork.Ratherthanmakingmultiplecopies ofamessageintendedtobedistributedtomultiplerecipientsatthe()oforiginofamessage,multicastinginitiallysendsjustone()anddoesnotcopyittotheindividualrecipientsuntilitreachestheclosestcommonpointonthenetwork,thereby()thebandwidthconsumed.Networkperformanceissignificantly()becauseitisn’tboggeddownwiththeprocessingandtransmissionofseverallargedatafiles;eachreceivingcomputerdoesn’thaveto()thetransmittingserverforthefile.
A.entity B.procession C.volume D.message正确答案D
