Networkscanbeinterconnectedbydifferentdevicesinthephysicallayernetworkscanbeconnectedby()_orhubs.whichjustmovethebitsfromonenetworktoanidenticalnetwork.Onelayerupwefindbridgesandswitcheswhichoperateatdatalinklayer.Theycanaccept(请作答此空)examinetheMACaddressandforwardtheframestoadifferentnetworkwhiledoingminorprotocoltranslationintheprocessinmenetworklayer,wehaveroutersthatcanconnecttwonetworks,Iftwonetworkshave()networklayer,theroutermaybeabletotranslatebetweenthepackerformats.Inthetransportlayerwefindtransportgateway,whichcaninterfacebetweentwotransportconnectionsFinally,intheapplicationlayer,applicationgatewaystranslatemessage().Asanexample,gatewaysbetweenInternete-mailandX.400e-mailmust()thee-mailmessageandchangevariousheaderfields.
A.frimes B.packets C.packages D.cells正确答案A
