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C
