《计算机网络》考题英文选择题.docx
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《计算机网络》考题英文选择题.docx
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《计算机网络》考题英文选择题
ComputerNetworks–Exam
1Shortquestions
Foreachquestion,pleasecircleasinglebestanswer.
1.IntheCSMA/CDprotocol,whatconditiononthetransmissiondelayTtransandthepropagationdelayTprophastobesatisfiedtoguaranteethatanodealwaysdetectsacollision?
A.Ttrans>Tprop
B.Ttrans>2TpropCORRECT
C.Ttrans D.2Ttrans 2.AliceandBobcommunicateinanalphabetthathasLletters.TheyuseamonoalphabeticsubstitutioncipherwithkeyK.AssumethatTrudyobtainsaplaintextmandthecorrespondingciphertextc.UnderwhatconditionscanTrudyrecoverthekeyKcompletely? A. containsatleast uniqueletters.CORRECT B. . C. . D. isnotempty. 3.TheWiMaXprotocol: A.providesthemaximumavailabledatarateoverawirelesschannel. B.usesunlicensedspectrum,suchasWiFi. C.providesamechanismforscheduling.CORRECT D.Alloftheaboveoptionsarecorrect. 4.Twohostssimultaneouslysenddatathroughalinkofcapacity1Mbps.HostAgeneratesdatawitharateof1MbpsandusesTCP.HostBusesUDPandtransmitsa100bytespacketevery1ms.Whichhostwillobtainhigherthroughput? A.HostA. B.HostB.CORRECT C.Theyobtainroughlythesamethroughput. D.Theyexperiencecongestioncollapseandnegligiblethroughput. 5.Whatisthetheoreticalupper-boundonthenumberofsimultaneousTCP/IPv4connectionsthatahostwithasingleIPaddresscanhandle? (Ignorememorylimitations.) A.216 B.232 C.264CORRECT D.unlimited 6.HostAsendsaTCPsegment(Seq=43,ACK=103),towhichhostBreplieswithaTCPsegment(Seq=103,ACK=57).ThepayloadofthefirstTCPsegmentis A.14byteslong.CORRECT B.43byteslong. C.46byteslong. D.57byteslong. E.60byteslong. 7.TheDistance-Vectoralgorithmisnot: A.iterative. B.asynchronous. C.distributed. D.usedinRIP. E.Noneoftheabove.CORRECT 8.Longestprefixmatchingisused: A.inrouterstoknowonwhichlinkinterfacetoforwardpackets.CORRECT B.inclasslessaddressingtousetheaddressspacemoreefficientlythaninclassfuladdressing. C.byNATtoincreasetheavailableaddressspaceinhomenetworks. D.toassignsubnetmasks. E.Noneoftheabove. 9.AnauthoritativeDNSserverknowsatop-leveldomainservervia: A.hostname. B.IPaddress.CORRECT C.canonicalhostname. D.alias. E.domain. 10.AuserrequestsaWebpagethatconsistsofsometextand3images.Thebrowser’scacheisempty.Forthispage,theclient’sbrowser: A.sends1httprequestmessageandreceives1httpresponsemessages. B.sends1httprequestmessageandreceives3httpresponsemessages. C.sends1httprequestmessageandreceives4httpresponsemessages. D.sends3httprequestmessagesandreceives3httpresponsemessages. E.sends4httprequestmessagesandreceives4httpresponsemessages.CORRECT 11.Whatistheadvantageofusingalayeredmodelofnetworking? A.Simplifiedthenetwork B.Forthepurposeofstandardization C.Dividesthecomplexityofinternetworkingintodiscrete,moreeasilylearnedoperationsubsets D.AlloftheaboveCORRECT 12.Whatisthenameofprotocoldataunit(PDU)atthenetworklayeroftheOSIreferencemodel? A.Transport B.Frame C.PacketCORRECT D.Segment 13.WhichistruewhenabroadcastissentoutinanEthernet802.3LAN? A.Thebroadcastissentonlytothedefaultgateway. B.Thebroadcastissentonlytothedestinationhardwareaddressinthebroadcast. C.Thebroadcastissenttoalldevicesinthecollisiondomain.CORRECT D.Thebroadcastissenttoalldevicesinthebroadcastdomain. 14.SegmentationofadatastreamhappensatwhichlayeroftheOSImodel? A.Physical B.DataLink C.Network D.TransportCORRECT 15.WhichoffollowinginternationalstandarddefinesforFastEthernet? A.IEEE802.3 B.IEEE802.3z C.IEEE802.3uCORRECT D.IEEE802.3ae 16.WhatdoestheDataLinklayerusetofindhostsonalocalnetwork? A.Logicalnetworkaddresses B.Portnumbers C.HardwareaddressesCORRECT D.Defaultgateways 17.WhatwerethekeyreasonstheISOreleasedtheOSImodel? A.Toallowcompaniestochargemorefortheirequipment B.TohelpvendorscreateinteroperablenetworkdevicesCORRECT C.Tohelpvendorscreateandsellspecializedsoftwareandhardware D.SotheIBMmainframewouldbereplacedwiththePC 18.WhatisusedattheTransportlayertostopareceivinghost’sbufferfromoverflowing? A.Segmentation B.Packets C.Acknowledgments D.FlowcontrolCORRECT 19.Whendataisencapsulated,whichisthecorrectorder? A.Data,frame,packet,segment,bit B.Segment,data,packet,frame,bit C.Data,segment,packet,frame,bitCORRECT D.Data,segment,frame,packet,bit 20.Whatdoestheterm“Base”indicatein100Base-TX? A.Themaximumdistance B.Thetypeofwiringused C.ALANswitchmethodusinghalfduplex D.AsignalingmethodforcommunicationonthenetworkCORRECT 21.Whatisthemaximumdistanceof100Base-T? A.100feet B.1000feet C.100metersCORRECT D.1000meters 22.Whichofthefollowingwoulddescribeatransportlayerconnectionthatwouldensurereliabledelivery? A.Routing B.AcknowledgmentsCORRECT C.Switching D.Systemauthentication 23.WhichofthefollowingisnotconsideredareasonforLANcongestion? A.Lowbandwidth B.Toomanyusersinabroadcastdomain C.Broadcaststorms D.RoutersCORRECT 24.Whichofthefollowingaretwobasictypesofdynamicrouting? A.Staticanddefault B.TCPandUDPexchange C.Distance-vectorandlink-stateCORRECT D.Noneoftheabove 25.IfyourLANnetworkiscurrentlycongestedandyouareusingonlyhubsinyournetwork,whatwouldbetheBESTsolutiontodecreasecongestiononyournetwork? A.Cascadeyourhubs. B.Replaceyourhubswithswitches.CORRECT C.Replaceyourhubswithrouters. D.Addfasterhubs. 26.Whattechnologyisausedbymostswitchestoresolvetopologyloopsandensurethatdataflowsproperlythroughasinglenetworkpath? A.RIP B.STPCORRECT C.IGRP D.Store-and-forward 27.WhichofthefollowingisoneofthecharacteristicsofIP? A.reliableandconnectionless B.unreliableandconnectionlessCORRECT C.reliableandconnection-oriented D.unreliableandconnection-oriented 28.Whatisthevalidhostrangeforsubnet172.16.10.16(Mask255.255.255.240)? A.172.16.10.20through172.16.10.22 B.172.16.10.16through172.16.10.23 C.172.16.10.17through172.16.10.31 D.172.16.10.17through172.16.10.30CORRECT 29.WhatrangeofaddressescanbeusedinthefirstoctetofaClassBnetworkaddress? A.1–126 B.128–190 C.128–191CORRECT D.129–192 30.Whichofthefollowingisnottrue? A.IPisconnectionlessandprovidesrouting. B.ARPisusedtofindanIPaddressofahost.CORRECT C.UDPisconnectionless. D.TCPisconnectionoriented. 31.WhichclassofIPaddressprovidesamaximumofonly254hostaddressespernetworkID? A.ClassA B.ClassB C.ClassCCORRECT D.ClassD 32.WhichprotocoltooluseICMP? A.Telnet B.PingCORRECT C.ARP D.FTP 33.WhichofthefollowingisanIEEEstandardforframetagging? A.802.1X B.802.3Z C.802.1Q D.802.3UCORRECT 34.Aclientwilluse____tosendemailstomail-server. A.POP3 B.SMTPCORRECT C.TELNET D.FTP 35.WhichprotocolusedinPPPallowsmultipleNetworklayerprotocolstobeusedduringaconnection? A.LCP B.NCPCORRECT C.HDLC D.X.25 36.Whentoomanypacketsarepresentinthesubnet,performancedegrades.Whatisthissituationcalled? A.deadlock B.congestionCORRECT C.networkfault D.networkbusy 37.Whichlanguagecanbeusedtorealizetheclient-sidedynamicwebpagegeneration? A.CGI B.ASPCORRECT C.JavaScript D.PHP 38.Thetwo-wireconnectionsbetweeneachsubscriber’stelephoneandtheendofficeareknown inthetradeasthe____. A.trunkB.localloopC.linkD.switchCORRECT 39.WhenwebpageistransmittedoverSSL,theprotocolusedis_____. A.HTTP B.SHTTP C.HTTPSCORRECT D.SSL 40.Nyquistprovedthatifanarbitrarysignalhasbeenrunthroughalow-passfilterofbandwidthH,thefilteredsignalcanbecompletelyreconstructedbymakingonly_____(exact)samplespersecond A.H B.0.5H C.2HCORRECT D.4H 41.ToconvertabinarymessagetoanASCIImessageinemailsystem,wecanuseencoding,whichbreakupgroupsof24bitsintofour6-bitunits,witheachunitbeingsentasalegalASCIIcharacter.(Refinpage262) A.base64CORRECT B.quoted-printable C.SMTP D.POP3 42.ACRCgeneratorpolynomialisG(x)=X8+X5+X2+l.Howmanybitswillthechecksumbe? A.7 B.8CORRECT C.9 D.10 43.Ifthelengthofsequenceis4bits,themaximumsendingwindowsizeshouldbe____. A.13 B.14 C.15CORRECT D.16 44.In802.11,tosolvethe_______stationproblemandthehiddenstationproblem,wecanuseCSMA/CAprotocol.Accordingthisprotocol,beforethestationsendingadata,itmustsendRTSframeandwaitaCTSframeback. A.fault B.mobile C.exposedCORRECT D.wireless 45.Ifthecongestionwindowsizeis20KB,andthereceivewindowsizeis30KB,whatisthemaximumbytescantheTCPentitytransmit? A.20KBCORRECT B.30KB C.50KB D.10KB 46.Portnumbersbelow________arecalledwell-knownportsandarereservedforstandardservices. A.256 B.1024CORRECT C.4096 D.1000 47.________,whichareoverlaynetworksontopofpublicnetworksbutwithmostofthepropertiesofprivatenetwork. A.PBX B.VPNCORRECT C.CDMA1X D.GPRS 48.TheproblemofrunningoutofIPaddressesisnotatheoreticalproblemthatmightoccuratsomepointinthedistantfuture.Somepeoplefeltthataquickfixwasneededfortheshortterm.Thisquickfixcameintheformof____________________. A.IP6 B.DHCP C.RARP D.NATCORRECT 49.Public-keyalgorithmshavethepropertythat_______keysareusedfore
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