计算机网络英文题库(附答案)chapter3.doc
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Chapter3TransportLayer
1.Atransport-layerprotocolprovidesforlogicalcommunicationbetween____.
AApplicationprocesses
BHosts
CRouters
DEndsystems
2.Transport-layerprotocolsrunin____.
AServers
BClients
CRouters
DEndsystems
3.Intransportlayer,thesendsidebreaksapplicationmessagesinto____,passestonetworklayer.
AFrames
BSegments
CData-grams
Dbitstreams
4.Servicesprovidedbytransportlayerinclude____.
AHTTPandFTP
BTCPandIP
CTCPandUDP
DSMTP
5.WhichofthefollowingservicesisnotprovidedbyTCP?
ADelayguaranteesandbandwidthguarantees
BReliabledatatransfersandflowcontrols
CCongestioncontrols
DIn-orderdatatransfers
6.Thesetwominimaltransport-layerservices----____and____----aretheonlytwoservicesthatUDPprovides!
Aprocess-to-processdatadelivery,errorchecking
Bcongestioncontrol,reliabledatatransfer
Cflowcontrol,congestioncontrol
DIn-orderdatatransfer,errorchecking
7.Portnumber’sscopeis____to____.
A0,1023
B0,65535
C0,127
D0,255
8.Theportnumbersrangingfrom____to____arecalledwell-knownportnumberandarerestricted.
A0,1023
B0,65535
C0,127
D0,255
9.UDPsocketidentifiedbytwocomponents,theyare____.
AsourceIPaddressesandsourceportnumbers
BsourceIPaddressesanddestinationIPaddresses
CdestinationIPaddressanddestinationportnumbers
Ddestinationportnumbersandsourceportnumbers
10.TCPsocketidentifiedbya(an)____.
A1-tuple
B2-tuple
C3-tuple
D4-tuple
11.WhichofthefollowingapplicationsnormallyusesUDPservices?
ASMTP
BStreamingmultimedia
CFTP
DHTTP
12. Reliable data transfer protocol over a perfectly reliable channel 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 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 selective repeat
16. Which of the following is not correct about GBN protocol?
A Only using ACK-s
B Using cumulative ACK-s
C Receiver discards all out-of-order packets
D It is not pipelined protocol
17. Which of the following is not correct about SR protocol?
A receiver individually acknowledges all correctly received packets
B sender only resends packets for which ACK not received
C It limits sequence number of sent but un-ACK-ed packets
D It is not a pipelined protocol
18.WhichofthefollowingaboutTCPconnectionisnotcorrect?
AItisabroadcastconnection
BItisapoint-to-pointconnection
CItisapipelinedconnection
DItisafullduplexconnection
19.TheSYNsegmentisusedfor____.
ATCPconnectionsetup
BTCPflowcontrol
CTCPcongestioncontrol
DClosingaTCPconnection
20.TheFINsegmentisusedfor____.
ATCPconnectionsetup
BTCPflowcontrol
CTCPcongestioncontrol
DClosingaTCPconnection
21.HowdoesTCPsenderperceivecongestion?
AThroughatimeoutevent
BThroughareceivingduplicateACK-sevent
CBothAandB
DEitherAorB
22.Extendinghost-to-hostdeliverytoprocess-to-processdeliveryiscalledtransport-layer____and.
Amultiplexingandde-multiplexing
Bstoringandforwarding
Cforwardingandfiltering
Dswitchingandrouting
23.UDPisa____servicewhileTCPisaconnection-orientedservice.
AConnectionless
BReliable
CConnection-oriented
DIn-order
24.TheUDPheaderhasonlyfourfields,theyare____.
ASourceportnumber,destinationportnumber,lengthandchecksum
BSourceportnumber,destinationportnumber,sourceIPanddestinationIP
CsourceIP,destinationIP,sourceMACaddressanddestinationMACaddress
DsourceIP,destinationIP,sequencenumberandACKsequencenumber
25.Therearetwo16-bitintegers:
1110011001100110,1101010101010101.Theirchecksumis____.
A0100010001000011
B1011101110111100
C1111111111111111
D1000000000000000
26.Themaximumamountofdatathatcanbegrabbedandplacedinasegmentislimitedbythe____.
AMaximumsegmentsize(MSS)
BMTU
CChecksum
DSequencenumber
27.TheMSSistypicallysetbyfirstdeterminingthelengthofthelargestlink-layerframethatcanbesentbythelocalsendinghost----theso-called____.
AMaximumtransmissionunit(MTU)
BMSS
CChecksum
DSequencenumber
28.AFilesizeof500,000bytes,MSSequals1000bytes.WhenwewanttotransmitthisfilewithTCP,thesequencenumberof
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- 计算机网络 英文 题库 答案 chapter3