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XML文件的构架可以归结为一个______。
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UML是一种______
Aninternetisacombinationofnetworksconnectedby26．Whenadatagramgoesfromasourcetoa27itwillprobablypassmany28untilitreachestherouterattachedtothedestinationnetwork．Arouterreceivesa29fromanetworkandpassesittoanothernetwork．Arouterisusuallyattachedtoseveralnetworks．WhenitreceivesapackettowhichnetworkshoulditpassthepacketThedecisionisbasedonoptimizationWhichoftheavailable30istheoptimumpathway
AtransportlayerprotocolhasseveralresponsibilitiesOneistocreateaprocess-to-processprogram-to-programcommunication;TCPusesport11toaccomplishthis.Anotherresponsibilityofatransportlayerprotocolistocreatea12anderror-controlmechanismatthetransportlevel．TCPusesasliding13protocoltoachieveflowcontrol．Itusestheacknowledgmentpackettime-outandretransmissiontoachieve14control．Thetransportlayerisalsoresponsibleforprovidingaconnectionmechanismfortheapplicationprogram．Theapplicationprogramsends15ofdatatothetransportlayer．Itistheresponsibilityofthetransportlayeratthesendingstationtomakeaconnectionwiththereceiver．
EachmachinesupportingTCPhasaTCPtransportentityeitheralibraryprocedureauserprocessorpartofthekernel.InallcaseitmanagesTCPstreamsand1totheIPlayer.ATCP2Acceptsuserdatestreamsfromlocalprocessbreaksthemintopiecesnotexceeding64KBandsendseachpieceasaseparateIP3.WhendatagramscontainingTCPdatearriveatamachinetheyaregiventotheTCPentitywhichreconstructstheoriginalbytestreams. TheIPlayergivesnoguaranteethatdatagramswillbedeliveredproperlysoitisuptoTCPtotimeoutand4themasneedbe.DatagramsdoarrivemaywelldosointhewrongorderitisalsouptoTCPto5themintomessagesinthepropersequence. 5是
For21serviceweneedavirtual-circuitsubnet．LetUSseehowthatworks．Theideabehindvirtualcircuitsistoavoidhavingtochooseanew22foreverypacketsent．Insteadwhenaconnectionisestablishedaroutefromthe23machinetothedestinationmachineischosenaspartoftheconnectionsetupandstoredintablesinsidethe24．Thatrouteisusedforalltrafficflowingovertheconnectionexactlythesamewaythatthetelephonesystemworks．Whentheconnectionisreleased．thevirtualcircuitisalsotenninated．Withconnection-orientedserviceeachpacketcarriesan25tellingwhichvirtualcircuititbelongsto．
For21serviceweneedavirtual-circuitsubnet．LetUSseehowthatworks．Theideabehindvirtualcircuitsistoavoidhavingtochooseanew22foreverypacketsent．Insteadwhenaconnectionisestablishedaroutefromthe23machinetothedestinationmachineischosenaspartoftheconnectionsetupandstoredintablesinsidethe24．Thatrouteisusedforalltrafficflowingovertheconnectionexactlythesamewaythatthetelephonesystemworks．Whentheconnectionisreleased．thevirtualcircuitisalsotenninated．Withconnection-orientedserviceeachpacketcarriesan25tellingwhichvirtualcircuititbelongsto．
函数f和g的定义如下图所示执行函数f时需要调用函数ga若采用传值调用方式CallByVahle调用ga则函数f的返回值为16若采用引用CallByReference方式调用ga则函数f的返回值为17fg形式参数xinta=3cintm=5c=gam=x*m;x=m-5returna+creturnx+m;
EachmachinesupportingTCPhasaTCPtransportentityeitheralibraryprocedureauserprocessorpartofthekernel.InallcaseitmanagesTCPstreamsand1totheIPlayer.ATCP2Acceptsuserdatestreamsfromlocalprocessbreaksthemintopiecesnotexceeding64KBandsendseachpieceasaseparateIP3.WhendatagramscontainingTCPdatearriveatamachinetheyaregiventotheTCPentitywhichreconstructstheoriginalbytestreams. TheIPlayergivesnoguaranteethatdatagramswillbedeliveredproperlysoitisuptoTCPtotimeoutand4themasneedbe.DatagramsdoarrivemaywelldosointhewrongorderitisalsouptoTCPto5themintomessagesinthepropersequence. 1是
[说明]无线网络利用无线电波作为数据的传导而就应用层面来讲它与有线网络的用途完全相似两者最大的不同之处是传输数据的媒介不同除此之外正因它是无线因此不论是在硬件架设或使用的机动性方面均比有线网络要有优势而无线局域网是利用无线技术实现快速接入以太网的技术无线网络与有线网络相比有哪些优点
Bothbusandtreetopologiesarecharacterizedbytheuseofmultipoint16．Forthebusallstationsattachthroughappropriatehardware17knownasatapdirectlytoalineartransmissionmediumorbus．Full-duplexoperationbetweenthestationandthetapallowsdatatobetransmittedontothebusandreceivedfromthe18．Atransmissionfromanystationpropagatesthelengthofthemediuminbothdirectionsandcanbereceivedbyallother19．Ateachendofthebusisa20whichabsorbsanysignalremovingitfromthebus．
[说明] 利用WindowsServer2008架设邮件服务器回答相应问题 假设WindowsServer2008安装在C盘则POP3安装完成后系统默认的邮件存储位置是什么更改根邮件目录后要使原有的域继续起作用需要进行哪些操作
某数码相机内置128MB的存储空间拍摄分辨率设定为1600×1200像素颜色深度为24位若不采用压缩存储技术使用内部存储器最多可拍摄______张照片
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AtransportlayerprotocolhasseveralresponsibilitiesOneistocreateaprocess-to-processprogram-to-programcommunication;TCPusesport11toaccomplishthis.Anotherresponsibilityofatransportlayerprotocolistocreatea12anderror-controlmechanismatthetransportlevel．TCPusesasliding13protocoltoachieveflowcontrol．Itusestheacknowledgmentpackettime-outandretransmissiontoachieve14control．Thetransportlayerisalsoresponsibleforprovidingaconnectionmechanismfortheapplicationprogram．Theapplicationprogramsends15ofdatatothetransportlayer．Itistheresponsibilityofthetransportlayeratthesendingstationtomakeaconnectionwiththereceiver．
[说明]无线网络利用无线电波作为数据的传导而就应用层面来讲它与有线网络的用途完全相似两者最大的不同之处是传输数据的媒介不同除此之外正因它是无线因此不论是在硬件架设或使用的机动性方面均比有线网络要有优势而无线局域网是利用无线技术实现快速接入以太网的技术在无线网络中通常要用WEP加密请解释WEP的含义
[说明]利用WindowsServer2008架设邮件服务器回答相应问题Windowsserver2008中POP3服务提供了哪些身份验证的方法
Bothbusandtreetopologiesarecharacterizedbytheuseofmultipoint16．Forthebusallstationsattachthroughappropriatehardware17knownasatapdirectlytoalineartransmissionmediumorbus．Full-duplexoperationbetweenthestationandthetapallowsdatatobetransmittedontothebusandreceivedfromthe18．Atransmissionfromanystationpropagatesthelengthofthemediuminbothdirectionsandcanbereceivedbyallother19．Ateachendofthebusisa20whichabsorbsanysignalremovingitfromthebus．
Aninternetisacombinationofnetworksconnectedby26．Whenadatagramgoesfromasourcetoa27itwillprobablypassmany28untilitreachestherouterattachedtothedestinationnetwork．Arouterreceivesa29fromanetworkandpassesittoanothernetwork．Arouterisusuallyattachedtoseveralnetworks．WhenitreceivesapackettowhichnetworkshoulditpassthepacketThedecisionisbasedonoptimizationWhichoftheavailable30istheoptimumpathway
[说明]利用WindowsServer2008架设邮件服务器回答相应问题邮件服务器通常提供POP3和SMTP两种服务它们各有什么作用
程序语言规定程序中的变量必须先定义或声明再引用则违反此规定的程序在______时报错
[说明] 在Windows的网络配置中对网络协议进行IP地址配置出现如图5-1所示的对话框 NetBEUI是和IP一样可以选择的配置协议它与IP的差别是什么
Amulticastroutermayreceivethousandsofmulticast6everydayfordifferentgroups.Ifarouterhasnoknowledgeaboutthemembershipstatusofthe7itmustbroadcastallofthesepackets.Thiscreatesalotoftrafficandconsumes8.Abettersolutionistokeepalistofgroupsinthenetworkforwhichthereisatleastoneloyalmember.9helpsthemulticastroutercreateandupdatethislist.Foreachgroupthereisonerouterthathasthedutyofdistributingthe10packetsdestinedforthatgroup.Thismeansthatiftherearethreemulticastroutersconnectedtoanetworktheirlistsofgroupidsaremutuallyexclusive.Ahostormulticastroutercanhavemembershipinagroup. 9是
AtransportlayerprotocolhasseveralresponsibilitiesOneistocreateaprocess-to-processprogram-to-programcommunication;TCPusesport11toaccomplishthis.Anotherresponsibilityofatransportlayerprotocolistocreatea12anderror-controlmechanismatthetransportlevel．TCPusesasliding13protocoltoachieveflowcontrol．Itusestheacknowledgmentpackettime-outandretransmissiontoachieve14control．Thetransportlayerisalsoresponsibleforprovidingaconnectionmechanismfortheapplicationprogram．Theapplicationprogramsends15ofdatatothetransportlayer．Itistheresponsibilityofthetransportlayeratthesendingstationtomakeaconnectionwiththereceiver．
下列权利不属于软件著作财产权的是______
For21serviceweneedavirtual-circuitsubnet．LetUSseehowthatworks．Theideabehindvirtualcircuitsistoavoidhavingtochooseanew22foreverypacketsent．Insteadwhenaconnectionisestablishedaroutefromthe23machinetothedestinationmachineischosenaspartoftheconnectionsetupandstoredintablesinsidethe24．Thatrouteisusedforalltrafficflowingovertheconnectionexactlythesamewaythatthetelephonesystemworks．Whentheconnectionisreleased．thevirtualcircuitisalsotenninated．Withconnection-orientedserviceeachpacketcarriesan25tellingwhichvirtualcircuititbelongsto．
EachmachinesupportingTCPhasaTCPtransportentityeitheralibraryprocedureauserprocessorpartofthekernel.InallcaseitmanagesTCPstreamsand1totheIPlayer.ATCP2Acceptsuserdatestreamsfromlocalprocessbreaksthemintopiecesnotexceeding64KBandsendseachpieceasaseparateIP3.WhendatagramscontainingTCPdatearriveatamachinetheyaregiventotheTCPentitywhichreconstructstheoriginalbytestreams. TheIPlayergivesnoguaranteethatdatagramswillbedeliveredproperlysoitisuptoTCPtotimeoutand4themasneedbe.DatagramsdoarrivemaywelldosointhewrongorderitisalsouptoTCPto5themintomessagesinthepropersequence. 3是
Amulticastroutermayreceivethousandsofmulticast6everydayfordifferentgroups.Ifarouterhasnoknowledgeaboutthemembershipstatusofthe7itmustbroadcastallofthesepackets.Thiscreatesalotoftrafficandconsumes8.Abettersolutionistokeepalistofgroupsinthenetworkforwhichthereisatleastoneloyalmember.9helpsthemulticastroutercreateandupdatethislist.Foreachgroupthereisonerouterthathasthedutyofdistributingthe10packetsdestinedforthatgroup.Thismeansthatiftherearethreemulticastroutersconnectedtoanetworktheirlistsofgroupidsaremutuallyexclusive.Ahostormulticastroutercanhavemembershipinagroup. 7是
[说明] 在Windows的网络配置中对网络协议进行IP地址配置出现如图5-1所示的对话框 什么场合下可选择自动获取IP什么场合下选择人工配置IP
若分页系统的地址结构如下图所示 该系统页的大小为11字节页号的取值范围为12 12
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