传输层小测题

QuizzesforTransportLayerDepartmentofComputerScience1.Oneofthemaindutiesofthetransportlayeristoprovide____________communication.A)node-to-nodeB)host-to-hostC)process-to-processD)Noneofthechoicesarecorrect2.Aclientprogramnormallyuses____________portnumber.Aserverprogramnormallyuses__________portnumber.A)awell-known;anephemeralB)anephemeral;awell-knownC)aprivate;awell-knownD)Noneofthechoicesarecorrect3.Asocketaddressisacombinationof__________.A)AMACaddressandalogicaladdressB)AMACaddressandaportnumberC)auser-specificaddressandalogicaladdressD)Noneofthechoicesarecorrect4.______________meansacceptingitemsfrommorethanonesource.______________meansdeliveringitemstomorethanonesource.A)Demultiplexing;MultiplexingB)Multiplexing;DemultiplexingC)Encapsulation;DecapsulationD)Pulling;Pushing5.________meanstheproducerdeliverstheitemswhentheyareproduced._______meanstheconsumertakestheitemswhenitisreadytodoso.A)Pushing;pullingB)Pulling;pushingC)Forwarding;acceptingD)Noneofthechoicesarecorrect6.Inthestop-and-waitprotocol,themaximumsendwindowsizeis______andthemaximumreceivewindowsizeis_______wheremisthenumberofbitsinthesequence.A)1;1B)2m;–1C)1;2mD)2m;2m7.IntheGo-Back-Nprotocol,themaximumsendwindowsizeis______andthemaximumreceivewindowsizeis_______,wheremisrelatedtothenumberofbitsinthesequencenumber.A)1;1B)1;2mC)2m–1;1D)2m–1;2m–18.Intheselective-repeatprotocol,themaximumsendwindowsizeis______andthemaximumreceivewindowsizeis_______,wheremisthenumberofbitsinthesequence.A)1;1B)1;2m–1C)2m–1;1D)2m–1;2m–19.UDPisa________________transportprotocol.A)connectionless,reliableB)connection-oriented,unreliableC)connectionless,unreliableD)Noneofthechoicesarecorrect10.UDPisanacronymfor_______.A)UserDeliveryProtocolB)UserDatagramProcedureC)UserDatagramProtocolD)Noneofthechoicesarecorrect11.Atthetransportlayer,todefinetheprocesses,weneedtwoidentifierscalled____________.A)logicaladdressesB)physicaladdressesC)portaddressesD)Noneofthechoicesarecorrect12.Theportsrangingfrom0to1,023arecalledthe___________ports.Theportsrangingfrom1,024to49,151arecalled___________ports.Theportsrangingfrom49,152to65,535arecalledthe___________ports.A)well-known;registered;dynamicorprivateB)registered;dynamicorprivate;well-knownC)privateordynamic;well-known;registeredD)privateordynamic;registered;well-known13.UDPandTCParetwoprotocolsatthe___________layer.A)datalinkB)networkC)transportD)application14.WhichofthefollowingfunctionsareperformedbyUDP?A)process-to-processcommunicationB)host-to-hostcommunicationC)node-to-nodecommunicationD)Noneofthechoicesarecorrect15.Aportnumberis_______bitslong.A)8B)16C)32D)6416.WhichofthefollowingdoesUDPprovide?A)flowcontrolB)connection-orienteddeliveryC)errorcontrolD)Noneofthechoicesarecorrect17.ThesourceportnumberontheUDPuserdatagramheaderdefines_______.A)thesendingcomputerB)thereceivingcomputerC)theprocessrunningonthesendingcomputerD)Noneofthechoicesarecorrect18.TousetheservicesofUDP,weneed________socketaddresses.A)fourB)twoC)threeD)Noneofthechoicesarecorrect19.UDPpacketsarecalled__________.A)userdatagramsB)segmentsC)framesD)Noneofthechoicesarecorrect20.UDPpacketshaveafixed-sizeheaderof_______bytes.A)16B)8C)40D)3221.TCPisa__________protocol.A)byte-orientedB)message-orientedC)block-orientedD)Noneofthechoicesarecorrect22.TCPgroupsanumberofbytestogetherintoapacketcalleda___________.A)userdatagramB)segmentC)datagramD)Noneofthechoicesarecorrect23.TCPisa(n)___________protocol.A)connection-orientedB)connectionlessC)bothconnection-orientedandconnectionlessD)Noneofthechoicesarecorrect24.TCPisa(n)_______transportprotocol.A)unreliableB)best-effortdeliveryC)reliableD)Noneofthechoicesarecorrect25.TCPuses_________________tocheckthesafeandsoundarrivalofdata.A)anacknowledgmentmechanismB)out-of-bandsignalingC)theservicesofanotherprotocolD)Noneofthechoicesarecorrect26.ThebytesofdatabeingtransferredineachconnectionarenumberedbyTCP.Thenumberingstartswitha__________________.A)0B)1C)randomlygeneratednumberD)Noneofthechoicesarecorrect27.InTCP,thesequencenumberforeachsegmentisthenumberofthe_______byte(virtualbyte)carriedinthatsegment.A)firstB)lastC)middleD)Noneofthechoicesarecorrect28.CommunicationinTCPis___________.A)simplexB)half-duplexC)full-duplexD)Noneofthechoicesarecorrect29.InTCP,thevalueoftheacknowledgmentfieldinasentsegmentdefinesthesequencenumberrelatedtothe______byteapartyexpectstoreceivenext.A)firstB)lastC)nextD)Noneofthechoicesarecorrect30.TheinclusionofthechecksumintheTCPsegmentis________.A)optionalB)mandatoryC)dependsonthetypeofdataD)Noneofthechoicesarecorrect31.InTCP,aSYNsegmentconsumes_____sequencenumber(s).A)noB)oneC)twoD)Noneofthechoicesarecorrect32.InTCP,aSYN+ACKsegmentconsumes_____sequencenumbers.A)noB)threeC)twoD)one33.InTCP,anACKsegment,ifcarryingnodata,consumes______sequencenumber(s).A)noB)oneC)twoD)Noneofthechoicesarecorrect34.TheconnectionestablishmentprocedureinTCPissusceptibletoaserioussecurityproblemcalledthe_________attack.A)ACKfloodingB)FINfloodingC)SYNfloodingD)Noneofthechoicesarecorrect35.TheSYNfloodingattackbelongstoagroupofsecurit