Foreachblank，choosethebestanswerfromthefourchoicesandwritedownontheanswersheet. ()isasixbytesOSIlayer2addresswhichisburnedintoeverynetworkingdevicethatprovidesitsuniqueidentityforpointtopointcommunication. (请作答此空)isaprofessionalorganizationofindividualsinmultipleprofessionswhichfocusesoneffortonlower-layerprotocols. ()functionswithtwolayersofprotocols.ItCanconnectnetworksofdifferentspeedsandcanbeadaptedtoanenvironmentasitexpands. ()isthepopularLANdevelopedunderthedirectionoftheIEEE802.5. ()isthepopularbackbonetechnologyfortransmittinginformationathighspeedwithahighleveloffaulttolerancewhichisdevelopedunderthedirectionofANSI.
A.ISO
B.ANSI
C.CCITT
D.IEEE
正确答案是D