诚信应考,考试作弊将带来严重后果！华南理工大学期末考试《ComputerNetworks》试卷(B)注意事项：1.考前请将密封线内填写清楚；2.所有答案请答在答题纸上(注：选择题答案请填入题目前面的表格中)；3．考试形式：闭卷；4.本试卷共5大题，满分100分，考试时间120分钟。题号12345总分得分评卷人1.Selectthecorrectchoice.(30scores,everyoneis2scores)NO.123456789101112131415solution(1)SupposeHostAwantstosendafiletoHostB.ThepathfromHostAtoHostBhasthreelinks,theirrates,,and.Assumingnoothertrafficinthenetwork,whatisthethroughputforthefiletransfer?()A.B.C.D.(2)Thetransferofawebdocumentfromonehosttoanotheris:()A.loss-intolerantandtimeinsensitiveB.loss-tolerantandtimesensitiveC.loss-intolerantandtimesensitiveD.noneoftheabove(3)Ethernetinterfaceaddresses()A.areassignedatmanufacturingtime.B.areassignedmanuallyorbyDNSC.aregeneratedrandomlyandcheckedforuniquenessbybroadcastingamessageD.sharethesamehighorderbits,whichdeterminethenetworkorsubnetinaninternetwork.(4)BasedonTCP/IParchitecture,whichofthefollowingprotocolbelongstodata-linklayer?()A.HTTPB.IPC.UDPD.PPP(5)TwoimportantreasonsthattheInternetisorganizedasahierarchyofnetworksforthepurposesofroutingare()A.LeastcostandmaximumfreecircuitavailabilityB.MessagecomplexityandspeedofconvergenceC.ScaleandadministrativeautonomyD.Linkcostchangesandlinkfailure《ComputerNetworks》试卷(B)第1页共7页_____________________…姓名学号学院专业座位号(密封线内不答题)……………………………………………………密………………………………………………封………………………………………线……………………………………线………………………………………(6)Withanexteriorroutingprotocol,whichofthefollowingissuesgenerallydominatetheroutingdecisions?()A.GeographicaldistancebetweenAS’sB.PolicyC.NumberofAS’straversedD.CurrentcongestionlevelsintheAS’s(7)Whichrangeofportnumberarereservedforservicesthatarecommonlyusedbyapplicationsthatrunonserves?()A.0to255.B.0to1023.C.1024to49151.D.49152to65535.(8)WhichinformationiscontainedintheheaderofNetworkLayertohelpdatadelivery?()A.portnumberB.DevicephysicaladdressC.Destinationhost’sIPaddressD.Virtualconnectionidentifier(9)Ininternetcommunication,IPdatagramwillgothroughthesourcehostandrouterstoreachthedestinationhost,usually()A.bothsourcehostandroutersallknowthecompletepathtothedestinationhostthatwillbereachedbyIPdatagram.B.sourcehostknowsthecompletepathtodestinationhostthatwillbereachedbyIPdatagram,butnonetheintermediaterouters.C.theintermediateroutersknowthecompletepathtodestinationhostthatwillbereachedbyIPdatagram,butnonethesourcehost.D.neithersourcehostnortheintermediateroutersknowthecompletepathtodestinationhostthatwillbereachedbyIPdatagram.(10)WhichcombinationofnetworkidandsubnetmaskcorrectlyidentifiesallIPaddressform172.16.128.0through172.16.159.255?()A.172.16.128.0255.255.255.224B.172.16.128.0255.255.0.0C.172.16.128.0255.255.224.0D.172.16.128.0255.255.255.192(11)WhathappenswhenanodeonanEthernetnetworkiscreatingaframeanditdoesnothavethedestinationMACaddress?()A.Thenodedropstheframe.B.Thenodesendsoutalayer3broadcastmessages.C.Thenodesendsamessagedirectlytotherouterfortheaddress.D.ThenodesendsoutanARPrequestwiththedestinationIPaddress.(12)Supposeanapplicationgenerateschunksof120bytesofdataeverysecond,andeachchunkgetsencapsulatedinaTCPsegmentandthenanIPdatagram(nooptionsfields).Whatpercentageofeachdatagramwillcontainapplicationdata?()A.80%B.75%C.60%D.25%(13)W...
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