宁波大学计算机网络习题集

..1.Incommunicationlinks,transmissionratemeans：A、BandwidthB、propagationspeedC、processspeedD、routerdelays正确答案：A2.AllcommunicationactivitiesinInternetaregovernedby:A、ProtocolsB、WebMasterC、ClientD、ChinaTelecom正确答案：A3.Thecenterofinternetstructureis:A、Tier-1ISPsB、LocalISPsC、RootDNSD、NAP正确答案：A4.Whencongestoccurinnetwork,whichdelaybecomelarge?A、propagationdelayB、queuingdelayC、transmissiondelayD、processingdelay正确答案：B5.Theinternetprotocolsnotdefine：A、orderofmessagesB、actionstakenC、formatD、price正确答案：D6.Theinternetprotocolsnotdefine：A、actionstakenB、orderofmessagesC、hackerD、format正确答案：C7.WhichisnotthetypesofprotocoldataunitinTCP/IP?A、frameB、datetimeC、segmentD、message正确答案：B8.Whichisnotaconnectedendsystemdeviceintheinternet?A、MobilePhoneB、PCserverC、PCworkstationD、Router正确答案：D9.Allcommunicationactivitiesinnetworkaregovernedby:A、ProtocolsB、ServersC、GovernmentD、Clients正确答案：A10.ForQueueingdelay,inwhichstate,averagequeuingdelaysmall:A、La/R=0.1B、La/R=0.9C、La/R>1D、La/R>10正确答案：A1应用层中的数据块常被称为:A、比特流B、帧C、分组D、消息正确答案：D2在TCP/IP层次协议中,传输层向应用层提供的接口是哪一个?A、PutB、PortC、SocksD、Socket正确答案：D3下列哪一组协议属于应用层协议？A、ICMP,RARP,ARPB、FTP,SMIP,TELNETC、ARP,IP,UDPD、IP,TCP,UDP正确答案：B4在互联网WEB应用中以下哪一项扮演了控制角色?A、HTML语言B、Web客户端C、协议D、Web服务器正确答案：C5下面哪一个特征是协议所不具备的:A、面向对象B、客服机/服务器C、无连接D、无状态正确答案：C6IE8.0浏览器默认使用的超文本传输协议是哪一个版本?A、WEB2.0B、1.0C、1.1D、2.0正确答案：C7在协议中,每一个对象的地址都可以标识为：A、UDPB、UMLC、UTPD、URL正确答案：D8需要浏览器在每一个请求中递交认证信息,这是因为协议的哪一个特性？A、面向连接B、无连接C、分布式D、无状态正确答案：D9在互联网WEB应用中连接由以下哪一方发起?A、HTML语言B、Web客户端C、协议D、Web服务器正确答案：B10Processesrunningindifferenthostscommunicatewithan:A、slottedALOHAprotocolB、InternetroutingprotocolC、application-layerprotocolD、interprocesscommunication正确答案：C1Whatisthedefaultpersistentmodelin/1.1:A、NonpersistentwithpipeliningB、PersistentwithpipeliningC、PersistentwithoutpipeliningD、Nonpersistent正确答案：B2Whichversionofhypertexttransferprotocolareusedindefaultmodenow?A、WEB2.0B、1.0C、1.1D、0.9正确答案：C3Theserverworksonwhichport:A、TCPportabove65535B、UDP80C、TCPportabove1024D、TCP80正确答案：D4messages<application-layerprotocolmessages>exchangedbetweenbrowser<client>andWebserver<server>with:A、IGMPB、ICMPC、UDPD、TCP正确答案：D5Theclientworksonwhichport:A、TCPportabove65535B、UDP80C、TCPportabove1024D、TCP80正确答案：C6Toindicatesendofmessagein,wecanuse:A、/bodyB、/htmlC、\ln\lf.\ln\lfD、\ln\lf正确答案：D7Whichconnectionscanbeusedby/1.1indefaultmode?A、p2pconnectionsB、udpconnectionsC、non-persistentconnectionsD、persistentconnections正确答案：D8WWWserversorganizeinformationinto:A、WEBpagesB、RelationalDatabaseC、DistributedhypertexthypermediaD、Yellowpages正确答案：A9servermaintainsnoinformationaboutpastclientrequests,Protocolsthatmaintain"state"are：A、SimpleB、ComplexC、SecurityD、Easy正确答案：B10Ifyouaredownloadingawebpagewithmultipleobjectsinit,whichofthefollowingisthemostefficientway？A、NonepersistentB、PersistentwithpipelineC、PersistentwithoutpipelineD、Noneoftheabove正确答案：B1Whatisnotcommunicationservicesprovidedtoappsinnetwork:A、connectionlessB、connection-orientedC、object-orientedD、TransmissionControlProtocol正确答案：C2Howisdatatransferredthroughnet,whatiswrong？A、statisticalmultiplexingB、disktodiskcopyC、packet-switchingD、circuitswitching正确答案：B3Inwhichnetwork,propagationdelaymaybegreaterthenqueuingdelay:A、FiberNetworkB、WireLANC、SatelliteNetwork​D、WIFINetwork正确答案：C4Whichisnotanetworkcommunicationlinks?A、FiberB、CopperC、SubwayD、Radio正确答案：C5Packet-switchednetwork'sgoalismovingpacketsthroughroutersfromsourcetodestinationvia:A、forwardB、storeC、dropD、replay正确答案：A6WhichPhysicalMediahaslowerrorrate?A、TwistedPairB、CoaxialcableC、FiberopticcableD、radio正确答案：C7Today’sInternetnotuseA、TCP/IPB、statisticalmultiplexingC、CircuitswitchingD、Packet-switchi正确答案：C8whichisnotCerfandKahn'sinternetworkingprinciples?A、minimalism,autonomyB、besteffortservicemodelC、statelessroutersD、centralizedcontrol正确答案：D9包交换中丢失的包去哪了？A、缓存在路由器B、在传输媒体上飞C、在上一个路由器D、彻底消失了正确答案：D10包交换中丢失的包会阻塞网络吗？A、会B、不会C、不确定D、真不知道正确答案：B1TheStatuscodeforrequestsucceededandrequestedobjectlaterinthismessageis:A、301MovedPermanentlyB、200OKC、400BadRequestD、404NotFound正确答案：B2WhichiswronginthefollowingstatementaboutClient-serverarchicture:A、clientscommunicatewithserverB、clientsmayhavedynamicIPaddressesC、clientsisalways-onhostD、clientsdonotcommunicatedirectlywitheachother正确答案：C3responsestatuscodesofrequesteddocumentnotfoundonserver,is:A、404B、500C、400D、304正确答案：A4Whichmothedtypeisnotprovidedin/1.0：A、HEADB、PUTC、POSTD、GET正确答案：B5IntheWebClient/Serverworkenvironment,whoplayacontrolrole?A、HTMLLanguageB、WebClientC、ProtocolD、WebServer正确答案：C6IfeverypageofthesiteneedUser-serverauthorization,wecanuse:A、NonpersistentB、PersistentC、ConditionalGET:client-sidecachingD、Cookies:keeping"state"正确答案：D7Webpageconsistsof<>whichincludesseveralreferencedobjects：A、baseHTML-fileB、homeHTML-fileC、hostHTML-fileD、referencedHTML-file正确答案：A8Webservermaintainsnoinformationaboutpastclientrequests,sois:A、unsatisfiedB、satisfiedC、statelessD、stateful正确答案：C9WhichisnotbasedonwebCaching?A、OfflineBrowseB、NATC、CDNSD、PROXY正确答案：B10InClient-serverparadigm,processsends/receivesmessagesto/fromits:A、FirewallB、DoorC、SocketD、Slot正确答案：C1协议的服务器端口号一般为:A、80B、110C、>1024D、>4096正确答案：A2协议的客户端端口号一般为:A、80B、110C、>1024D、>4096正确答案：C31.1中持续/流水线模式时,可以同时传多个对象吗？A、不可以B、可以C、不知道D、不确定正确答案：41.1中持续/流水线模式时,可以同时在一个socket中传输多个对象吗？A、不可以B、可以C、不知道D、不确定正确答案：A5安全性更好的协议标准是什么？A、2.0B、SC、HTML5D、FLASH正确答案：B6互联网上哪个应用不属于WEB2.0？A、SMSB、SNSC、BLOGD、FACEBOOK正确答案：A7Proxy服务器在实现上主要是利用了什么方法？A、条件更新B、条件请求C、动态DNSD、动态IP正确答案：B8一个报文的大小可能是多大？A、小于1480字节B、小于64K字节C、大于64K字节D、理论上无限制正确答案：D9IE8浏览器下允许并发的连接数可能是多少？A、1B、2C、4D、8正确答案：C10下述哪个方法不能向服务器递交信息？A、headB、getC、putD、post正确答案：A1IfyouwanttofindtheserverofWWW.NBU.EDU,selecttheDNSsearchtype?A、Type=CNameB、Type=NSC、Type=MXD、Type=A正确答案：D2WhichtypeofDNSquerycanreturnnamevalueofmailserverassociatedwithdomainname?A、type=NSB、type=CNAMEC、type=MXD、type=A正确答案：C3IfyouwanttobuildaContentDistributionNetworks,YoucantheDNSsearchtypeforalias：A、Type=CNameB、Type=MXC、Type=NSD、Type=A正确答案：A4IfyouwanttofindtheauhoritativenameserverofdomainNBU.EDU,selecttheDNSsearchtype?A、Type=CNameB、Type=NSC、Type=MXD、Type=A正确答案：B5Inclienthost,weneedtoconfigIPwith:A、RootdomainserversB、Top-leveldomainserversC、AuthoritativeDNSserversD、LocalNameServer正确答案：D6Whichdomainnameiswrong?A、cs.un.nlB、cs.keio.ac.jpC、eng.sunD、/com/sun/eng正确答案：D7InDNS,"Idon’tknowthisname,butaskthisserver"means:A、authoritativenameserverB、recursivequeryC、LocalnameserverD、iteratedquery正确答案：D8ThereisidentificationinDNSmessages,whichisa16bitnumberforqueryandreplytoqueryuses：A、samenumberB、number+1C、number+8D、number+16正确答案：A9WhichisnotthereasonfordecentralizeDNS?A、singlepointoffailureB、trafficvolumeC、distantcentralizeddatabaseD、copyright正确答案：D10WhichiswrongforDNS:A、queryandreplymessages,bothwithsamemessageformatB、distributeddbstoringresourcerecords<RR>C、WhenahostmakesaDNSquery,queryissenttoitsRootDNSserverD、distributeddatabaseimplementedinhierarchyofmanynameservers正确答案：C1Whenftpserverreceivesfilecommand,whichopensthe2ndTCPconnectionforfiletranfer:A、serverorclientB、serverandclientC、clientD、server正确答案：A2FtpClientobtainsauthorizationovercontrolconnectiononport：A、20B、21C、25D、110正确答案：B3WhichAPPprotocoluseseparatecontrolanddataconnectionsontoport:A、Email110and25B、Ftp21and20C、80and808D、Telnet25and1025正确答案：B4FTPclientbrowsesremotedirectorybysendingcommandsover:A、IPconnectionB、UDPconnectionC、dataconnectionD、controlconnection正确答案：D5WhichapplicationisusuallybasedonUDPandTCPprotocol?A、NetworkGamesB、FTPDownloadC、SendingE-mailD、WebBrowsing正确答案：A6在下面列出的TCP/IP命令中,哪一个可以被用来远程登录主机？A、telnetB、ftpC、loginD、tftp正确答案：A7Inwhich,FTPdataconnectcaninitiationfromport20onservertohightportonclient?A、PassiveFTPB、ActiveFTPC、SFTPD、TFTP正确答案：B8Inwhich,FTPdataconnectcaninitiationfromhighportonclienttohighportonserver?A、ActiveFTPB、PassiveFTPC、SFTPD、TFTP正确答案：B9WhichisnotasamplecommandsthatsentasASCIItextovercontrolchannelinFTP?A、USERB、PASSC、LISTD、HEAD正确答案：D10WhichisnotaSamplereturncodesinFTP?A、304B、331C、125D、425正确答案：A1IfyouwanttofindthemailserverofdomainNBU.EDU,selecttheDNSsearchtype?A、Type=MAILB、Type=NSC、Type=MXD、Type=A正确答案：C2WhichiswrongforSMTP:A、SMTPusetwoseparatedconnectionsforoutgoingmailsB、SMTPserverusesCRLF.CRLFtodetermineendofmessageC、SMTPrequiresmessage<header&body>tobein7-bitASCIID、SMTPusespersistentconnections正确答案：A3Whichisnotaemailapplicationprotocol?A、SMNPB、SMTPC、IMAPD、POP3正确答案：A4InMIME,MswordisonesubtypesofContent-Type:A、TextB、ApplicationC、ImageD、Doc正确答案：B5Inemailprotocol,whichwillnotbeused?A、MINEB、QP<Quote-Printable>C、Base64D、CDNS正确答案：D6ForsendemailviaSMTP,itrequiresmessage<header&body>tobein:A、octet-streamB、8-bitASCIIC、7-bitASCIID、Ziped正确答案：C7Whichoneisarightemailaddress?A、wang$163B、wang102&163C、wang#sinaD、Wangsina正确答案：D8WhichelementarenotinMailServers:A、MailboxcontainsincomingmessagesforuserB、Messagequeueofoutgoing<tobesent>mailmessagesC、SMTPprotocolbetweenmailserverstosendemailmessagesD、NATdeviceforoutgoingmails正确答案：D9Whichisnotamajorcomponents?A、useragentsB、mailserversC、simplemailtransferD、gmail正确答案：D10SMTPusesTCPtoreliablytransferemailmessagefromclienttoserverwithport:A、21B、25C、75D、110正确答案：B1InP2Pfilesharing,whichiseasytoshutdownbylaw:A、QueryfloodingB、decentralizeddirectoryC、centralizeddirectoryD、pureClinet/Server正确答案：C2InP2Pfilesharing,inwhichthegroupleaderscangetoverloaded:A、centralizeddirectoryB、QueryfloodingC、decentralizeddirectoryD、PureClinet/Server正确答案：C3C/S,P2Pand_____arethreetypesofapplicationarchitectures.A、B/SB、HybridofC/SandP2PC、UsertouserD、CommandandConquer正确答案：B4Whichisnotanetworkendsystemarchitecturemodel:A、Client/ServerB、Peer-PeerC、End-EndD、HybridClient/ServerandPeer-Peer正确答案：C5TheproblemswithcentralizeddirectoryofP2Pnotinclude:A、CopyrightinfringementB、PerformancebottleneckC、BootstrapnodeneededD、Singlepointoffailure正确答案：C6TheproblemswithdecentralizeddirectoryofP2Pmaybe:A、CopyrightinfringementB、PerformancebottleneckC、BootstrapnodeneededD、Singlepointoffailure正确答案：C7IncentralizeddirectoryofP2P,thedisadvantagesofapproachmaybe:A、complexprotocolB、bootstrapnodeneededC、singlepointoffailureD、groupleaderscangetoverloaded正确答案：C8Queryfloodingisfullydistributed,itmeans：A、nodistributedserverB、nocentralserverC、noIPneededD、nowater正确答案：B9WhichoneiswronginP2Pdecentralizeddirectory?A、EachpeeriseitheragroupleaderorassignedtoagroupleaderB、GroupleadertracksthecontentinallitschildrenC、PeerqueriesotherpeersD、Groupleadermayqueryothergroupleaders正确答案：C10whichoneiswronginP2Pwithcentralizeddirectory？A、peerisdecentralized,B、filetransferisdecentralizedC、locatingcontentishighlycentralizedD、locatingcontentishighlydecentralized正确答案：D1邮件发送方显示邮件已经发送成功,可是有的时候接受方却没有接受到邮件,那是因为显示的仅仅为客户端发送到自己的SMTP服务器成功了。正确答案：√2邮件传输过程可以省略中间服务器的转发,可否直接传输到对方的邮件服务器。正确答案：√3书上说方式是一个请求、一个封装、一个对象进行传送的,而我们平时通过浏览器发邮件时可以同时发送多个附件,这是矛盾的。正确答案：×4EMAIL传输文件时,可以区分文件类型,文本文件使用TCP/IP协议传输,视频文件使用UDP协议传输,这样传输速度会更快。正确答案：×5有时在QQ邮箱发送邮件,会挺久后才显示在发送中,可是文件本身并不大呀,这是因为邮件服务器的排队发送的队列可能比较长。正确答案：√6邮件服务器之间的邮件传送使用SMTP协议,客户端往邮件服务器发送邮件采用POP3协议。正确答案：×7SMTP要求必须在提供了账户名和密码之后才可以登录SMTP服务器,这就可以彻底防止那些垃圾邮件。正确答案：×8IMAP协议可以阅读邮件,但是不可以发送邮件,邮件客户端发送邮件必须用SMTP。正确答案：√9Base64的编码方式不能解决繁体汉字的邮件处理。正确答案：×1Incommunicationlinks,transmissionratemeans：A、BandwidthB、propagationspeedC、processspeedD、routerdelays正确答案：A2Whencongestoccurinnetwork,whichdelaybecomelarge?A、propagationdelayB、queuingdelayC、transmissiondelayD、processingdelay正确答案：B3应用层中的数据块常被称为:A、比特流B、帧C、分组D、消息正确答案：D4Ifyouaredownloadingawebpagewithmultipleobjectsinit,whichofthefollowingisthemostefficientway？A、NonepersistentB、PersistentwithpipelineC、PersistentwithoutpipelineD、Noneoftheabove正确答案：B5WhichoneiswronginP2Pdecentralizeddirectory?A、​EachpeeriseitheragroupleaderorassignedtoagroupleaderB、GroupleadertracksthecontentinallitschildrenC、PeerqueriesotherpeersD、Groupleadermayqueryothergroupleaders正确答案：C6Inclienthost,weneedtoconfigIPwith:A、Rootdomain<TLD>serversB、Top-leveldomain<TLD>serversC、AuthoritativeDNSserversD、LocalNameServer正确答案：D7Whatisthedefaultpersistentmodelin/1.1:A、NonpersistentwithpipeliningB、PersistentwithpipeliningC、PersistentwithoutpipeliningD、Nonpersistent正确答案：B8Whichdomainnameiswrong?A、cs.un.nlB、cs.keio.ac.jpC、eng.sunD、/com/sun/eng正确答案：D9IE8浏览器下允许并发的连接数可能是多少？A、1B、2C、4D、8正确答案：C10下列哪一组协议属于应用层协议？A、ICMP,RARP,ARPB、FTP,SMIP,TELNETC、ARP,IP,UDPD、IP,TCP,UDP正确答案：B11Proxy服务器在实现上主要是利用了什么方法？A、条件更新B、条件请求C、动态DNSD、动态IP正确答案：B12ThereisidentificationinDNSmessages,whichisa16bitnumberforqueryandreplytoqueryuses：A、samenumberB、number+1C、number+8D、number+16正确答案：A13WWWserversorganizeinformationinto:A、WEBpagesB、RelationalDatabaseC、DistributedhypertexthypermediaD、Yellowpages正确答案：A14ForsendemailviaSMTP,itrequiresmessage<header&body>tobein:A、octet-streamB、8-bitASCIIC、7-bitASCIID、Ziped正确答案：C15WhichisnotasamplecommandsthatsentasASCIItextovercontrolchannelinFTP?A、USERB、PASSC、LISTD、HEAD正确答案：D16WhichapplicationisusuallybasedonUDPandTCPprotocol?A、NetworkGamesB、FTPDownloadC、SendingE-mailD、WebBrowsing正确答案：A17Whatisnotcommunicationservicesprovidedtoappsinnetwork:A、connectionlessB、connection-orientedC、object-orientedD、TransmissionControlProtocol正确答案：C18Thecenterofinternetstructureis:A、Tier-1ISPsB、LocalISPsC、RootDNSD、NAP正确答案：A19Inwhichnetwork,propagationdelaymaybegreaterthenqueuingdelay？A、FiberNetworkB、WireLANC、SatelliteNetwork​D、WIFINetwork正确答案：C20InMIME,MswordisonesubtypesofContent-Type:A、TextB、ApplicationC、ImageD、Doc正确答案：D二、多选题〔题数：10,共20分1AsystemviewoftheInternetinclude:A、MillionsofconnectedcomputingdevicesB、CommunicationlinksC、CircuitD、RoutersE、Protocols正确答案：ABDE2WhicharetheproblemswithcentralizeDNS?A、singlepointoffailureB、trafficvolumeC、distantcentralizeddatabaseD、statelessE、maintenancenoteasy正确答案：ABCE3WhichMethodtypesarein/1.0:A、GETB、POSTC、HEADD、PUT正确答案：ABC4Howdoconnectendsystemstoedgerouter:A、NetworkofrelationshipsB、MobileaccessnetworksC、InstitutionalaccessnetworksD、Residentialaccessnetworks正确答案：BCD5Whatarethemajorcomponentsofemail?A、useragentsB、mailserversC、simplemailtransferprotocolD、mailstoreprotocolsE、mailaccessprotocols正确答案：ABCE6InClient-serverarchitecture,clientscanbe:A、CommunicatedirectlywitheachotherB、HavedynamicIPaddressesC、IntermittentlyconnectedD、Communicatewithserver正确答案：BCD7InClient-serverarchitecture,servercanbe:A、Always-onhostB、PermanentIPaddressC、ServerfarmsforscalingD、Initalizeconnectiontoclient正确答案：ABC8Application-layerprotocoldefines：A、TypesofmessagesexchangedB、SyntaxofmessagetypesC、SemanticsofthefieldsD、Rulesforwhenandhowprocessessend&respondtomessagesE、Portnumberofservers正确答案：ABCD9InwhichQueuingdelaystate,more"work"arrivingthancanbeserviced,averagedelayisinfinite?R=linkbandwidth<bps>L=packetlength<bits>a=averagepacketarrivalrateA、La/R~0.1B、La/R~0.2C、La/R~1.1D、La/R~1.2E、La/R~2.0正确答案：CDE10Webcachingcan：A、Reduceresponsetimeforclientrequest.B、Reducetrafficonaninstitution’saccesslink.C、ResultinProviderstoeffectivelydelivercontentD、GuaranteeQOS正确答案：ABC三、判断题〔题数：10,共20分1WithSMTP,itispossibletosendmultiplemailmessagesoverthesameTCPconnection.正确答案：√2IfaPOP3clientdoesnotsendthedelecommand,copiesofthemessagesthattheclienthasretrievedremaininthemailserver.正确答案：√3TheDate:headerintheresponsemessageindicateswhentheobjectintheresponsewaslastmodified.正确答案：√4邮件服务器之间的邮件传送使用SMTP协议,客户端往邮件服务器发送邮件采用POP3协议。正确答案：×5IMAP协议可以阅读邮件,但是不可以发送邮件,邮件客户端发送邮件必须用SMTP。正确答案：√6DNSlookupsofteninvolveacombinationofrecursiveanditerativequeries.正确答案：√7有时在QQ邮箱发送邮件,会挺久后才显示在发送中,可是文件本身并不大呀,这是因为邮件服务器的排队发送的队列可能比较长。正确答案：√8Base64的编码方式不能解决繁体汉字的邮件处理。正确答案：×9TheDate:headerintheresponsemessageindicateswhentheobjectintheresponsewaslastmodified.正确答案：√10Itispossibleforamailclienttosende-mailmessagesoverratherthanSMTP.正确答案：√1在TCP/IP协议簇的层次中,解决不同计算机的进程之间通信问题是在〔A、网络层B、应用层C、接口层D、传输层正确答案：D2WhatisFSMinReliabledatatransfer?A、FeedbackShiftMarkB、FrequencyShiftManageC、FinitestatemachinesD、ForeignServicemachines正确答案：C3OneofInternettransport-layerprotocolsisTCP,itproviderservicesA、AccesscontrolB、Reliable,in-orderdeliveryC、DelayguaranteesD、Bandwidthguarantees正确答案：B4InGBN,whenreceiverreceiveaout-of-orderpacket,thendiscardandre-ACKthepacketwith:A、lowestin-orderport#B、highestin-orderport#C、lowestin-ordersequence#D、highestin-ordersequence#正确答案：D5RDTHandleduplicates,senderaddswhattoeachpacket:A、PhonenumberB、SocketnumberC、SequencenumberD、TTLvalue正确答案：C6InRDTApproachs,whichisdesignedforperformance:A、ACKorNAKB、sequence#C、pipelineD、checksum正确答案：C7InRDTprotocol,whichcanincreasetheuseofphysicalresources:A、ChecksumB、ACKC、PipelineD、Timer正确答案：C8Inchannelwithbiterrors,RDTrecoverfromerrorsneed:A、AMDB、ARQC、ARPD、ACKs正确答案：D9InRDTApproachs,whichisdesignedforbiterror:A、checksumB、pipelineC、sequence#D、ACKorNAK正确答案：A10UDP协议能够提供的服务是：A、流量控制B、拥塞控制C、连接管理D、端到端传输正确答案：D1TCPFlowControlisaspeed-matchingservicefor:A、keepthesendratelargethenthesenderapplication'sdrainrateB、keepthesendratelargethenthereceivingapplication'sdrainrateC、matchingthesendratetothesenderapplication'sdrainrateD、matchingthesendratetothereceivingapplication'sdrainrate正确答案：D2WhichoneisnotthemechanismofTCPCongestionControl:A、ConservativeaftertimeouteventsB、slowstartC、FIFOD、AIMD正确答案：C3WhicheventwillnotbeinTCPReceiver:A、ArrivalofsegmentthatpartiallyorcompletelyfillsgapB、Arrivalofout-of-ordersegmenthigher-than-expectseq.#.Nogapdetected.C、Arrivalofin-ordersegmentwithexpectedseq#.OneothersegmenthasACKpending.D、Arrivalofin-ordersegmentwithexpectedseq#.Alldatauptoexpectedseq#alreadyACKed.正确答案：B4WhichofthefollowingmeasuresthetimefromonesegmenttransmissiontoACKreceipt:A、largestRTTB、estimationRTTC、sampleRTTD、doubleRTT正确答案：C5InthemechanismofTCPCongestionControl,AIMDmeans:A、afterinput/mustdecreaseB、additiveincrease/multiplicativedecreaseC、afterincrease/mustdecreaseD、additiveinput/multiplicativedecode正确答案：B6Intoday'sinternet,theapproachestowardscongestioncontrolisA、End-EndcongestioncontrolB、Network-assistedcongestioncontrolC、Step-By-StepcongestioncontrolD、Qos正确答案：A7IneventofTCPReceiver,whenarrivalofin-ordersegmentwithexpectedseq#.Alldatauptoexpectedseq#alreadyACKed,then:A、DelayedACK.Waitupto500msfornextsegment.Ifnonextsegment,sendACK.B、ImmediatelysendsinglecumulativeACK,ACKingbothin-ordersegments.C、ImmediatelysendduplicateACK,indicatingseq.#ofnextexpectedbyte.D、ImmediatesendACK,providedthatsegmentstartatlowerendofgap正确答案：A8HowdoesTCPsenderperceivecongestion?A、GoBacktoNB、delayeventC、RetransmissioneventD、Lostevent正确答案：D9UDPisoneofInternettransport-layerprotocols,ithas:A、No-frillsextensionof"best-effort"IPB、ConnectionsetupC、FlowcontrolD、Congestioncontrol正确答案：A10InTCP,Retransmissionscanbetriggeredby:A、TimeouteventsB、CongestioncontrolC、DuplicatedatasD、Flowcontrol正确答案：A1UDP不存在公平性,UDP有可能会压制TCP传输,TCP是应对这种压制可以采用多线程多连接传输。正确答案：√2TCP拆除连接要比建立连接多一次握手,是因为需要双向拆除并双向确认。正确答案：√3tcp可以提供流量控制,UDP的应用一定不能提供流量控制。正确答案：×4在TCP协议中,传输的数据有没有优先级的设定,重传的数据包有优先发送权。正确答案：×5TCP协议有拥塞控制策略,网络还会发生拥塞崩溃是因为同时存在UDP,而且TCP拥塞的推断有时间滞后等问题。正确答案：√6TCP协议如果双方一直没有收发信息,超过一定时间协议会强制关闭连接。正确答案：×7TCP的ACK可以携带数据乱序和网络拥塞的信息。正确答案：×8可以设计应用采用udp协议发送消息、tcp协议接受消息。正确答案：×9UDP协议下网络拥塞会造成严重丢包。正确答案：√10用TCP发送数据时发送端发送数据的速度未知,不会出现接收端来不及接受的问题。正确答案：×1WhichisanInter-ASroutingprotocols:A、ICMP:InteriorControlMessageProtocolB、IGRP:InteriorGatewayRoutingProtocolC、BGP:BorderGatewayProtocolD、RIP:RoutingInformationProtocol正确答案：C2WhichisnotacommonIntra-ASroutingprotocols:A、ICMP:InteriorControlMessageProtocolB、IGRP:InteriorGatewayRoutingProtocolC、OSPF:OpenShortestPathFirstD、RIP:RoutingInformationProtocol正确答案：A3WhichprotocolcanassigntheindividingIPaddresstothehostandrouterinterfacesinitsorganization?A、DHCPB、NATC、POP3D、OSPF正确答案：A4InInternetControlMessageProtocol,ifICMPDatasenderrorthenreporttowhom:A、SourceB、DestinationC、RouteD、None正确答案：A5IPReassembly<afterfragmentation>willbein:A、NAT