计算机网络英文题库(附答案)chapter3

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1、Chapter3TransportLayer1.Atransport-layerprotocolprovidesforlogicalcommunicationbetween____.AApplicationprocessesBHostsCRoutersDEndsystems2.Transport-layerprotocolsrunin____.AServersBClientsCRoutersDEndsystems3.Intransportlayer,thesendsidebreaksapplicationmessagesinto____,passestonetwork

2、layer.AFramesBSegmentsCData-gramsDbitstreams4.Servicesprovidedbytransportlayerinclude____.AHTTPandFTPBTCPandIPCTCPandUDPDSMTP5.WhichofthefollowingservicesisnotprovidedbyTCP?ADelayguaranteesandbandwidthguaranteesBReliabledatatransfersandflowcontrolsCCongestioncontrolsDIn-orderdatatransfe

3、rs6.Thesetwominimaltransport-layerservices----____and____----aretheonlytwoservicesthatUDPprovides!Aprocess-to-processdatadelivery,errorcheckingBcongestioncontrol,reliabledatatransferCflowcontrol,congestioncontrolDIn-orderdatatransfer,errorchecking7.Portnumber’sscopeis____to____.A0,1023B

4、0,65535C0,127D0,2558.Theportnumbersrangingfrom____to____arecalledwell-knownportnumberandarerestricted.A0,1023B0,65535C0,127D0,2559.UDPsocketidentifiedbytwocomponents,theyare____.AsourceIPaddressesandsourceportnumbersBsourceIPaddressesanddestinationIPaddressesCdestinationIPaddressanddest

5、inationportnumbersDdestinationportnumbersandsourceportnumbers10.TCPsocketidentifiedbya(an)____.A1-tupleB2-tupleC3-tupleD4-tuple11.WhichofthefollowingapplicationsnormallyusesUDPservices?ASMTPBStreamingmultimediaCFTPDHTTP12. Reliable data transfer protocol over a perfectly reliable channe

6、l is____.  A  rdt1.0   B  rdt2.0 C  rdt3.0   D  rdt2.1 13. Reliable data transfer protocol over a channel with bit errors and packet losses is ____.  A  rdt1.0  B  rdt2.0 C  rdt3.0   D  rdt2.1 14. Which of the following about reliable data transfer over a channel with bit errors is not 

7、correct? A  RDT2.0: assuming ACK and NAK will not be corrupted B  RDT2.1: assuming ACK and NAK can be corrupted C  RDT2.2: only use ACK-s D  RDT2.2: use both ACK-s and NAK-s 15. Which of the following protocols is not pipelining protocols?  A  TCP B  rdt3.0 C  GO-BACK-N D  sele