Foreachblank，choosethebestanswerfromthefourchoicesandwritedownontheanswersheet. ()isasixbytesOSIlayer2addresswhichisburnedintoeverynetworkingdevicethatprovidesitsuniqueidentityforpointtopointcommunication. ()isaprofessionalorganizationofindividualsinmultipleprofessionswhichfocusesoneffortonlower-layerprotocols. ()functionswithtwolayersofprotocols.ItCanconnectnetworksofdifferentspeedsandcanbeadaptedtoanenvironmentasitexpands. ()isthepopularLANdevelopedunderthedirectionoftheIEEE802.5. (请作答此空)isthepopularbackbonetechnologyfortransmittinginformationathighspeedwithahighleveloffaulttolerancewhichisdevelopedunderthedirectionofANSI.
A.X.25
B.ATM
C.FDDI
D.SMDS
正确答案是C