38、【单项选择题】 ☆ 收藏本题 IPmulticastingisasetoftechnologiesthatenableefficientdeliveryofdatatomanylocationsonanetwork.Ratherthanmakingmultiplecopiesofamessageintendedtobedistributedtomultiplerecipientsatthe()oforiginofamessage,multicastinginitiallysendsjustone()anddoesnotcopyittotheindividualrecipientsuntilitreachestheclosestcommonpointonthenetwork,thereby()thebandwidthconsumed.Networkperformanceissignificantly()becauseitisn’tboggeddownwiththeprocessingandtransmissionofseverallargedatafiles;eachreceivingcomputerdoesn’thaveto()thetransmittingserverforthefile.
A.extending B.minimizing C.demolishing D.reducing正确答案B
