搜索
I.Choosethesinglecorrectanswerfromfollowingchoose.(1.5*20=30)[Correctchecked:1.5;Otherwise:0]1.Whichphysicalmediahashigh-speedoperationandlowerrorrate:A[]A.Fiberopticcable[]B.Coaxialcable[]C.Twistedpair[]D.Radio2.Ifnofreebuffersinrouter,thearrivingpacketswillbe:B[]A.dropped[]B.queued[]C.returned[]D.marked3.Whichcanprovidesdelaymeasurementfromsourcetorouteralongend-endInternetpathtowardsdestination:A[]A.Ping[]B.Traceroute[]C.Ipconfig[]D.Nslookup4.InTCP/IP,whichlayercanmakeroutingofdatagramsfromsourcetodestination:C[]A.Applicaion[]B.Transport[]C.Network[]D.DataLink5.Webpageconsistsof()whichincludesseveralreferencedobjects：A[]A.referencedHTML-file[]B.hostHTML-file[]C.pathHTML-file[]D.baseHTML-file6.WhatisthedefaultpersistentmodelinHTTP/1.1:C[]A.NonpersistentHTTP[]B.Persistentwithoutpipelining[]C.Persistentwithpipelining[]D.Nonpersistentwithpipelining7.Webservermaintainsnoinformationaboutpastclientrequests,soHTTPis:B[]A.stateful[]B.stateless[]C.satisfied[]D.unsatisfied8.FTPclientbrowsesremotedirectorybysendingcommandsover:D[]A.connection-less[]B.freeconnection[]C.dataconnection[]D.controlconnection9.WhichcansatisfyclientrequestwithoutinvolvingoriginserverA[]A.Webcaches[]B.Writecaches[]C.TCPbuffer[]D.Routerbuffer10.UDPsocketidentifiedby:B[]A.two-tuple(sourceIPaddress,sourceportnumber)[]B.two-tuple(destIPaddress,destportnumber)[]C.two-tuple(sourceIPaddress,destportnumber)[]D.two-tuple(destIPaddress,sourceportnumber)11.InGBN,whenreceiverreceiveaout-of-orderpacket,thendiscardandre-ACKthepacketwith:[]A.highestin-ordersequence#A[]B.lowestin-ordersequence#[]C.highestin-orderport#[]D.lowestin-orderport#12.InRDTApproachs,whichisdesignedforperformance:B[]A.checksum[]B.pipeline[]C.sequence#[]D.ACKorNAK13.Queueddatagramatfrontofrouter’squeuepreventsothersinqueuefrommovingforwardis:A[]A.Head-of-the-Line(HOL)blocking[]B.Hops-of-the-Line(HOL)blocking[]C.Head-of-the-List(HOL)blocking[]D.Hops-of-the-List(HOL)blocking14.What’sanetwork?FromIPaddressperspectivetheycanphysicallyreacheachotherwithoutinterveningrouterandthedeviceinterfaceswith:C[]A.sameIPaddress[]B.sameTCPport#[]C.samenetworkpartofIPaddress[]D.samehostpartofIPaddress15.LargeIPdatagramdivided(“fragmented”)withinnetwork,itwillbereassembled:B[]A.onlyatlastrouter[]B.onlyatfinaldestination[]C.onlyatnextrouter[]D.maybeatnextrouter16.WhichisnotacommonIntra-ASroutingprotocols:D[]A.RIP:RoutingInformationProtocol[]B.OSPF:OpenShortestPathFirst[]C.IGRP:InteriorGatewayRoutingProtocol[]D.ICMP:InteriorControlMessageProtocol17.WhichisnotaMACRandomAccessprotocolinEthernet:D[]A.SCMA[]B.SCMA/CA[]C.SCMA/CD[]D.SlottedSCMA18.InDHCPclient-serverscenario,whichmessagehasDHCP-optionsfield:D[]A.hostbroadcasts“DHCPdiscover”[]B.DHCPserverrespondswith“DHCPoffer”[]C.hostrequestsIPaddress:“DHCPrequest”[]D.DHCPserversendsaddress:“DHCPack”19.HowtodetermineMACaddressofhostB,IfknowinghostB’sIPaddress?A[]A.ARP[]B.RARP[]C.RAP[]D.RIP20.WhichdevicecanbreaksubnetintoLANsegments:C[]A.IPmask[]B.NAT[]C.Router[]D.SwitchII.Choosethemultiplecorrectanswerfromfollowingchoose.(2*10=20)[Allcorrectchecked:2;Partcorrectchecked:1;Nochecked:0;Fullchecked:0]1.Whichisthepartofnetworkstructure:ABD[]A.networkedge[]B.networkcore[]C.networkuser[]D.accessnetworks2.Howtoconnectendsystemstoedgerouter?BCD[]A.Microsoftaccessnetworks[]B.Residentialaccessnetworks[]C.Institutionalaccessnetworks[]D.Mobileaccessnetworks3.Whatkindoftransportservicedoesanapplicationneed?ABC[]A.Dataloss[]B.Timing[]C.Bandwidth[]D.Security4.ElectronicMailthreephasesoftransferis:ABD[]A.handshaking(greeting)[]B.transferofmessages[]C.opensthe2ndTCPconnection[]D.close5.InTCPConnectionManagement,initializeTCPvariablesinclude：AB[]A.sequence#[]B.buffers[]C.SenderMTU[]D.RcvWindow6.Howdoessenderperceivecongestion?AB[]A.timeout[]B.3duplicateACKs[]C.3duplicatedata[]D.slowstart7.TCPCongestionControlusethreemechanisms:ABC[]A.additiveincreaseandmultiplicativedecrease[]B.slowstart[]C.Conservativeaftertimeoutevents[]D.additivedecreaseandmultiplicativeincrease8.WhataretheKeyNetwork-LayerFunctions:ABC[]A.forwarding[]B.routing[]C.connectionsetup[]D.flowcontrol9.LinkLayerServicesinclude:ABD[]A.Reliabledeliverybetweenadjacentnodes[]B.FlowControlbetweenadjacentnodes[]C.ConnectionManage[]D.ErrorDetectionandCorrection10.MACProtocol’staxonomy,threebroadclassesis:ABC[]A.ChannelPartitioning[]B.RandomAccess[]C.Takingturns[]D.Peer-to-peerIII.Filltheblankfromoptions.(1.5*16=24)1).Thenetworkprotocolsdefineformat,orderofmessagesentandreceivedamongnetworkentities,andactiontakenonmessagetransmission,receipt.(options:delay/format/policy/order/request/replay/actionstaken/price/interface)2).InTCPCongestionControl,after3duplicateACKsCongWiniscutinhalfandwindowthengrows____linearly___.Butaftertimeoutevent,CongWininsteadsetto1MSS,windowthengrows___exponentially____,whenituptoa__threshold____again,thengrowslinearly.(options:half/double/1MSS/0MSS/linearly/exponentially/threshold/top/bottom)3).PleasefillthegeneralformatofHttprequestmessage:HTTPrequestmessagegeneralformat9.[Method]sp10.[URL]sp11.[vers