IPmulticastingisasetoftechnologiesthatenableefficientdeliveryofdatatomanylocationsonanetwork.Ratherthanmakingmultiplecopiesofamessageintendedtobedistributedtomultiplerecipientsatthe(请作答此选项)oforiginofamessage,multicastinginitiallysendsjustone()anddoesnotcopyittotheindividualrecipientsuntilitreachestheclosestcommonpointonthenetwork,thereby()thebandwidthconsumed.Networkperformanceissignificantly()becauseitisn’tboggeddownwiththeprocessingandtransmissionofseverallargedatafiles;eachreceivingcomputerdoesn’thaveto()thetransmittingserverforthefile. A.point
A.bottom B.hea D.sight正确答案A
