傳輸層小測題

傳輸層小測題傳輸層小測題傳輸層小測題V:1.0精細(xì)整理，僅供參考傳輸層小測題日期：20xx年X月QuizzesforTransportLayerDepartmentofComputerScienceOneofthemaindutiesofthetransportlayeristoprovide____________communication. A) node-to-node B) host-to-host C) process-to-process D) Noneofthechoicesarecorrect Aclientprogramnormallyuses____________portnumber.Aserverprogramnormallyuses__________portnumber. A) awell-known;anephemeral B) anephemeral;awell-known C) aprivate;awell-known D) NoneofthechoicesarecorrectAsocketaddressisacombinationof__________. A) AMACaddressandalogicaladdress B) AMACaddressandaportnumber C) auser-specificaddressandalogicaladdress D) Noneofthechoicesarecorrect______________meansacceptingitemsfrommorethanonesource.______________meansdeliveringitemstomorethanonesource.A) Demultiplexing;MultiplexingB) Multiplexing;DemultiplexingC) Encapsulation;DecapsulationD) Pulling;Pushing________meanstheproducerdeliverstheitemswhentheyareproduced._______meanstheconsumertakestheitemswhenitisreadytodoso. A) Pushing;pulling B) Pulling;pushing C) Forwarding;accepting D) NoneofthechoicesarecorrectInthestop-and-waitprotocol,themaximumsendwindowsizeis______andthemaximumreceivewindowsizeis_______wheremisthenumberofbitsinthesequence. A) 1;1 B) 2m;–1 C) 1;2m D) 2m;2mIntheGo-Back-Nprotocol,themaximumsendwindowsizeis______andthemaximumreceivewindowsizeis_______,wheremisrelatedtothenumberofbitsinthesequencenumber. A) 1;1 B) 1;2m C) 2m–1;1 D) 2m–1;2m–1Intheselective-repeatprotocol,themaximumsendwindowsizeis______andthemaximumreceivewindowsizeis_______,wheremisthenumberofbitsinthesequence.A) 1;1B) 1;2m–1C) 2m–1;1D) 2m–1;2m–1UDPisa________________transportprotocol.A) connectionless,reliableB) connection-oriented,unreliableC) connectionless,unreliableD) NoneofthechoicesarecorrectUDPisanacronymfor_______.A) UserDeliveryProtocolB) UserDatagramProcedureC) UserDatagramProtocolD) NoneofthechoicesarecorrectAtthetransportlayer,todefinetheprocesses,weneedtwoidentifierscalled____________. A) logicaladdresses B) physicaladdresses C) portaddresses D) NoneofthechoicesarecorrectTheportsrangingfrom0to1,023arecalledthe___________ports.Theportsrangingfrom1,024to49,151arecalled___________ports.Theportsrangingfrom49,152to65,535arecalledthe___________ports. A)well-known;registered;dynamicorprivate B)registered;dynamicorprivate;well-known C)privateordynamic;well-known;registered D)privateordynamic;registered;well-knownUDPandTCParetwoprotocolsatthe___________layer. A)datalink B)network C)transport D)applicationWhichofthefollowingfunctionsareperformedbyUDP A)process-to-processcommunication B)host-to-hostcommunication C)node-to-nodecommunication D)NoneofthechoicesarecorrectAportnumberis_______bitslong. A) 8 B) 16 C) 32 D) 64WhichofthefollowingdoesUDPprovide A) flowcontrol B) connection-orienteddelivery C) errorcontrol D) NoneofthechoicesarecorrectThesourceportnumberontheUDPuserdatagramheaderdefines_______. A) thesendingcomputer B) thereceivingcomputer C) theprocessrunningonthesendingcomputer D) NoneofthechoicesarecorrectTousetheservicesofUDP,weneed________socketaddresses. A) four B) two C) three D) NoneofthechoicesarecorrectUDPpacketsarecalled__________. A) userdatagrams B) segments C) frames D) NoneofthechoicesarecorrectUDPpacketshaveafixed-sizeheaderof_______bytes. A) 16 B) 8 C) 40 D) 32TCPisa__________protocol. A) byte-oriented B) message-oriented C) block-oriented D) NoneofthechoicesarecorrectTCPgroupsanumberofbytestogetherintoapacketcalleda___________. A) userdatagram B) segment C) datagram D) NoneofthechoicesarecorrectTCPisa(n)___________protocol. A) connection-oriented B) connectionless C) bothconnection-orientedandconnectionless D) NoneofthechoicesarecorrectTCPisa(n)_______transportprotocol. A) unreliable B) best-effortdelivery C) reliable D) NoneofthechoicesarecorrectTCPuses_________________tocheckthesafeandsoundarrivalofdata. A) anacknowledgmentmechanism B) out-of-bandsignaling C) theservicesofanotherprotocol D) NoneofthechoicesarecorrectThebytesofdatabeingtransferredineachconnectionarenumberedbyTCP.Thenumberingstartswitha__________________. A) 0 B) 1 C) randomlygeneratednumber D) NoneofthechoicesarecorrectInTCP,thesequencenumberforeachsegmentisthenumberofthe_______byte(virtualbyte)carriedinthatsegment. A) first B) last C) middle D) NoneofthechoicesarecorrectCommunicationinTCPis___________. A) simplex B) half-duplex C) full-duplex D) NoneofthechoicesarecorrectInTCP,thevalueoftheacknowledgmentfieldinasentsegmentdefinesthesequencenumberrelatedtothe______byteapartyexpectstoreceivenext. A) first B) last C) next D) NoneofthechoicesarecorrectTheinclusionofthechecksumintheTCPsegmentis________. A) optional B) mandatory C) dependsonthetypeofdata D) NoneofthechoicesarecorrectInTCP,aSYNsegmentconsumes_____sequencenumber(s). A) no B) one C) two D) NoneofthechoicesarecorrectInTCP,aSYN+ACKsegmentconsumes_____sequencenumbers. A) no B) three C) two D) oneInTCP,anACKsegment,ifcarryingnodata,consumes______sequencenumber(s). A) no B) one C) two D) NoneofthechoicesarecorrectTheconnectionestablishmentprocedureinTCPissusceptibletoaserioussecurityproblemcalledthe_________attack. A) ACKflooding B) FINflooding C) SYNflooding D) NoneofthechoicesarecorrectTheSYNfloodingattackbelongstoagroupofsecurityattacksknownasa_____attack. A) denialofservice B) replay C) man-in-themiddle D) NoneofthechoicesarecorrectInTCP,aFINsegmentconsumes____sequencenumbersifitdoesnotcarrydata. A) two B) three C) no D) oneInTCP,aFIN+ACKsegmentconsumes_____sequencenumber(s)ifitdoesnotcarrydata. A) two B) three C) one D) noInTCP,oneendcanstopsendingdatawhilestillreceivingdata.Thisiscalleda______termination. A) half-close B) half-open C) full-close D) NoneofthechoicesarecorrectTCPslidingwindowsare__________oriented. A) packet B) segment C) byte D) NoneofthechoicesarecorrectInTCP,thesizeofthesendwindowisthe________ofrwndandcwnd. A) maximum B) sumof C) minimum D) NoneofthechoicesarecorrectInTCP,thewindowshouldnotbe_________. A) opened B) closed C) shrunk D) slideInTCP,thereceivercantemporarilyshutdownthewindow;thesender,however,canalwayssendasegmentof_____byte(s)afterthewindowisshutdown. A) ten B) zero C) one D) NoneofthechoicesarecorrectAseriousproblemcanariseintheslidingwindowoperationwheneitherthesendingapplicationprogramcreatesdataslowlyorthereceivingapplicationprogramconsumesdataslowly,orboth.Thisproblemiscalledthe______. A) sillywindowsyndrome B) unexpectedsyndrome C) windowbug D) NoneofthechoicesarecorrectNagle'salgorithmcansolvethesillywindowsyndromecreatedbythe_________. A) sender B) receiver C) bothsenderandreceiver D) NoneofthechoicesarecorrectClark'ssolutioncansolvethesillywindowsyndromecreatedbythe_________. A) sender B) receiver C) bothsenderandreceiver D) NoneofthechoicesarecorrectDelayedacknowledgmentcansolvethesillywindowsyndromecreatedbythe_________. A) sender B) receiver C) bothsenderandreceiver D) NoneofthechoicesarecorrectInTCP,anACKsegmentsthatcarrynodataconsumes_______sequencenumber(s). A) no B) one C) two D) NoneofthechoicesarecorrectInmodernimplementationsofTCP,aretransmissionoccursiftheretransmissiontimerexpiresor________duplicateACKsegmentshavearrived. A) one B) two C) three D) NoneofthechoicesarecorrectInTCP,________retransmissiontimerissetforanACKsegment. A) one B) aprevious C) no D) NoneofthechoicesarecorrectInTCP,therecanbe______RTTmeasurement(s)inprogressatanytime. A) two B) onlyone C) several D) NoneofthechoicesarecorrectWeneedtomultiplytheheaderlengthfieldby_______tofindthetotalnumberofbytesintheTCPheader. A) 2 B) 4 C) 6 D) NoneofthechoicesarecorrectInTCP,urgentdatarequirestheurgentpointerfieldaswellastheURGbit(tobeset)inthe_______field. A) control B) offset C) sequencenumber D) NoneofthechoicesarecorrectInTCP,iftheACKvalueis200,thenbyte_______hasbeenreceivedsuccessfully. A) 199 B) 200 C) 201 D) NoneofthechoicesarecorrectInTCP,the_______timerpreventsalongidleconnectionbetweentwoTCPs. A) retransmission B) persistence C) keepalive D) NoneofthechoicesarecorrectInTCP,the_______timerisneededtohandlethezerowindow-sizeadvertisement. A) retransmission B) persistence C) keepalive D) NoneofthechoicesarecorrectInTCP,Karn'salgorithmisusedincalculationsbythe_______timer. A) retransmission B) persistence C) keepalive D) NoneofthechoicesarecorrectInTCP,aspecialsegmentcalledaprobeissentbyasendingTCPwhenthe_______timergoesoff. A) transmission B) persistence C) keepalive D) Noneofthechoicesarecorrect__________controlreferstothemechanismsandtechniquestokeeptheloadbelowthecapacity. A) flow B) error C) congestion D) NoneofthechoicesarecorrectInTCP's________algorithmthesizeofthecongestionwindowincreasesexponentiallyuntilitreachesathreshold. A) congestionavoidance B) congestiondetection C) slowstart D) NoneofthechoicesarecorrectInTCP's__________algorithmthesizeofthecongestionwindowincreasesadditivelyuntilcongestionisdetected. A) congestionavoidance B) congestiondetection C) slowstart D) Noneofthechoicesarecorrect________treatsthetwosignsofcongestiondetections,timeoutandthreeduplicateACKs,inthesameway. A) TahoTCP B) RenoTCP C) newRenoTCP D) NoneofthechoicesarecorrectIn______TCP,whentheconnectionisestablished,TCPstartstheslowstartalgorithmsandsetsthessthreshvariabletoapre-agreedvalue(normally64or128kilobytes)andthecwndvariableto1MSS. A) TahoTCP B) RenoTCP C) newRenoTCP D) NoneofthechoicesarecorrectThe___________addedanewstatetothecongestioncontrolFSM,calledthefastrecoverystate. A) TahoTCP B) RenoTCP C) newRenoTCP D) NoneofthechoicesarecorrectThe___________treatedthetwosignalsofcongestion,timeoutandarrivalofthreeduplicateACKs,differently. A) TahoTCP B) RenoTCP C) newRenoTCP D) NoneofthechoicesarecorrectThe__________stateinRenoTCPisastatesomehowbetweentheslowstartandthecongestionavoidancestates. A) congestionavoidance B) congestiondetection C) slowrecovery D) NoneofthechoicesarecorrectIntheRenoTCP,whenTCPentersthefastrecovery,ifduplicateACKscontinuetocome,TCP____________________________________. A) staysinthisstate,butthecwndgrowsadditively B) staysinthisstate,butthecwndgrowsexponentially C) movestoslowstartstate D) movestothecongestionavoidancestatebutdeflatethesizeofthecwndtossthreshvalueIntheRenoTCP,whenTCPentersthefastrecovery,ifatimeoutoccurs,TCP____________________________________. A) staysinthisstate,butthecwndgrowsadditively B) staysinthisstate,butthecwndgrowsexponentially C) movestoslowstartstate D) movestothecongestionavoidancestatebutdeflatethesizeofthecwndtossthreshvalueIntheRenoTCP,whenTCPentersthefastrecovery,