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XML文件的构架可以归结为一个______。
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For21serviceweneedavirtual-circuitsubnet．LetUSseehowthatworks．Theideabehindvirtualcircuitsistoavoidhavingtochooseanew22foreverypacketsent．Insteadwhenaconnectionisestablishedaroutefromthe23machinetothedestinationmachineischosenaspartoftheconnectionsetupandstoredintablesinsidethe24．Thatrouteisusedforalltrafficflowingovertheconnectionexactlythesamewaythatthetelephonesystemworks．Whentheconnectionisreleased．thevirtualcircuitisalsotenninated．Withconnection-orientedserviceeachpacketcarriesan25tellingwhichvirtualcircuititbelongsto．
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Amulticastroutermayreceivethousandsofmulticast6everydayfordifferentgroups.Ifarouterhasnoknowledgeaboutthemembershipstatusofthe7itmustbroadcastallofthesepackets.Thiscreatesalotoftrafficandconsumes8.Abettersolutionistokeepalistofgroupsinthenetworkforwhichthereisatleastoneloyalmember.9helpsthemulticastroutercreateandupdatethislist.Foreachgroupthereisonerouterthathasthedutyofdistributingthe10packetsdestinedforthatgroup.Thismeansthatiftherearethreemulticastroutersconnectedtoanetworktheirlistsofgroupidsaremutuallyexclusive.Ahostormulticastroutercanhavemembershipinagroup. 7是
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Amulticastroutermayreceivethousandsofmulticast6everydayfordifferentgroups.Ifarouterhasnoknowledgeaboutthemembershipstatusofthe7itmustbroadcastallofthesepackets.Thiscreatesalotoftrafficandconsumes8.Abettersolutionistokeepalistofgroupsinthenetworkforwhichthereisatleastoneloyalmember.9helpsthemulticastroutercreateandupdatethislist.Foreachgroupthereisonerouterthathasthedutyofdistributingthe10packetsdestinedforthatgroup.Thismeansthatiftherearethreemulticastroutersconnectedtoanetworktheirlistsofgroupidsaremutuallyexclusive.Ahostormulticastroutercanhavemembershipinagroup. 9是
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EachmachinesupportingTCPhasaTCPtransportentityeitheralibraryprocedureauserprocessorpartofthekernel.InallcaseitmanagesTCPstreamsand1totheIPlayer.ATCP2Acceptsuserdatestreamsfromlocalprocessbreaksthemintopiecesnotexceeding64KBandsendseachpieceasaseparateIP3.WhendatagramscontainingTCPdatearriveatamachinetheyaregiventotheTCPentitywhichreconstructstheoriginalbytestreams. TheIPlayergivesnoguaranteethatdatagramswillbedeliveredproperlysoitisuptoTCPtotimeoutand4themasneedbe.DatagramsdoarrivemaywelldosointhewrongorderitisalsouptoTCPto5themintomessagesinthepropersequence. 3是
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Bothbusandtreetopologiesarecharacterizedbytheuseofmultipoint16．Forthebusallstationsattachthroughappropriatehardware17knownasatapdirectlytoalineartransmissionmediumorbus．Full-duplexoperationbetweenthestationandthetapallowsdatatobetransmittedontothebusandreceivedfromthe18．Atransmissionfromanystationpropagatesthelengthofthemediuminbothdirectionsandcanbereceivedbyallother19．Ateachendofthebusisa20whichabsorbsanysignalremovingitfromthebus．
Bothbusandtreetopologiesarecharacterizedbytheuseofmultipoint16．Forthebusallstationsattachthroughappropriatehardware17knownasatapdirectlytoalineartransmissionmediumorbus．Full-duplexoperationbetweenthestationandthetapallowsdatatobetransmittedontothebusandreceivedfromthe18．Atransmissionfromanystationpropagatesthelengthofthemediuminbothdirectionsandcanbereceivedbyallother19．Ateachendofthebusisa20whichabsorbsanysignalremovingitfromthebus．
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