计算机网络教程自顶向下方法选择题及答案Chapt3TransportLayerQUIZZ.docx
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计算机网络教程自顶向下方法选择题及答案Chapt3TransportLayerQUIZZ.docx
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计算机网络教程自顶向下方法选择题及答案Chapt3TransportLayerQUIZZ
Chapter3TransportLayer
1.
Oneofthemaindutiesofthetransportlayeristoprovide____________communication.
A)node-to-node
B)host-to-host
C)process-to-process
D)Noneofthechoicesarecorrect
2.
Aclientprogramnormallyuses____________portnumber.Aserverprogramnormallyuses__________portnumber.
A)awell-known;anephemeral
B)anephemeral;awell-known
C)aprivate;awell-known
D)Noneofthechoicesarecorrect
3.
Asocketaddressisacombinationof__________.
A)AMACaddressandalogicaladdress
B)AMACaddressandaportnumber
C)auser-specificaddressandalogicaladdress
D)Noneofthechoicesarecorrect
4.
______________meansacceptingitemsfrommorethanonesource.______________meansdeliveringitemstomorethanonesource.
A)Demultiplexing;Multiplexing
B)Multiplexing;Demultiplexing
C)Encapsulation;Decapsulation
D)Pulling;Pushing
5.
________meanstheproducerdeliverstheitemswhentheyareproduced._______meanstheconsumertakestheitemswhenitisreadytodoso.
A)Pushing;pulling
B)Pulling;pushing
C)Forwarding;accepting
D)Noneofthechoicesarecorrect
6.
Inthestop-and-waitprotocol,themaximumsendwindowsizeis______andthemaximumreceivewindowsizeis_______wheremisthenumberofbitsinthesequence.
A)1;1
B)2m;–1
C)1;2m
D)2m;2m
7.
IntheGo-Back-Nprotocol,themaximumsendwindowsizeis______andthemaximumreceivewindowsizeis_______,wheremisrelatedtothenumberofbitsinthesequence.number.
A)1;1
B)1;2m
C)2m–1;1
D)2m–1;2m–1
8.
Intheselective-repeatprotocol,themaximumsendwindowsizeis______andthemaximumreceivewindowsizeis_______,wheremisthenumberofbitsinthesequence.
A)1;1
B)1;2m–1
C)2m–1;1
D)2m–1;2m–1
9.
UDPisa________________transportprotocol.
A)connectionless,reliable
B)connection-oriented,unreliable
C)connectionless,unreliable
D)Noneofthechoicesarecorrect
10.
UDPisanacronymfor_______.
A)UserDeliveryProtocol
B)UserDatagramProcedure
C)UserDatagramProtocol
D)Noneofthechoicesarecorrect
11.
Atthetransportlayer,todefinetheprocesses,weneedtwoidentifierscalled____________.
A)logicaladdresses
B)physicaladdresses
C)portaddresses
D)Noneofthechoicesarecorrect
12.
Theportsrangingfrom0to1,023arecalledthe___________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-known
13.
UDPandTCParetwoprotocolsatthe___________layer.
A)datalink
B)network
C)transport
D)application
14.
WhichofthefollowingfunctionsareperformedbyUDP?
A)process-to-processcommunication
B)host-to-hostcommunication
C)node-to-nodecommunication
D)Noneofthechoicesarecorrect
15.
Aportnumberis_______bitslong.
A)8
B)16
C)32
D)64
16.
WhichofthefollowingdoesUDPprovide?
A)flowcontrol
B)connection-orienteddelivery
C)errorcontrol
D)Noneofthechoicesarecorrect
17.
ThesourceportnumberontheUDPuserdatagramheaderdefines_______.
A)thesendingcomputer
B)thereceivingcomputer
C)theprocessrunningonthesendingcomputer
D)Noneofthechoicesarecorrect
18.
TousetheservicesofUDP,weneed________socketaddresses.
A)four
B)two
C)three
D)Noneofthechoicesarecorrect
19.
UDPpacketsarecalled__________.
A)userdatagrams
B)segments
C)frames
D)Noneofthechoicesarecorrect
20.
UDPpacketshaveafixed-sizeheaderof_______bytes.
A)16
B)8
C)40
D)32
21.
TCPisa__________protocol.
A)byte-oriented
B)message-oriented
C)block-oriented
D)Noneofthechoicesarecorrect
22.
TCPgroupsanumberofbytestogetherintoapacketcalleda___________.
A)userdatagram
B)segment
C)datagram
D)Noneofthechoicesarecorrect
23.
TCPisa(n)___________protocol.
A)connection-oriented
B)connectionless
C)bothconnection-orientedandconnectionless
D)Noneofthechoicesarecorrect
24.
TCPisa(n)_______transportprotocol.
A)unreliable
B)best-effortdelivery
C)reliable
D)Noneofthechoicesarecorrect
25.
TCPuses_________________tocheckthesafeandsoundarrivalofdata.
A)anacknowledgmentmechanism
B)out-of-bandsignaling
C)theservicesofanotherprotocol
D)Noneofthechoicesarecorrect
26.
ThebytesofdatabeingtransferredineachconnectionarenumberedbyTCP.Thenumberingstartswitha__________________.
A)0
B)1
C)randomlygeneratednumber
D)Noneofthechoicesarecorrect
27.
InTCP,thesequencenumberforeachsegmentisthenumberofthe_______byte(virtualbyte)carriedinthatsegment.
A)first
B)last
C)middle
D)Noneofthechoicesarecorrect
28.
CommunicationinTCPis___________.
A)simplex
B)half-duplex
C)full-duplex
D)Noneofthechoicesarecorrect
29.
InTCP,thevalueoftheacknowledgmentfieldinasentsegmentdefinesthesequencenumberrelatedtothe______byteapartyexpectstoreceivenext.
A)first
B)last
C)next
D)Noneofthechoicesarecorrect
30.
TheinclusionofthechecksumintheTCPsegmentis________.
A)optional
B)mandatory
C)dependsonthetypeofdata
D)Noneofthechoicesarecorrect
31.
InTCP,aSYNsegmentconsumes_____sequencenumber(s).
A)no
B)one
C)two
D)Noneofthechoicesarecorrect
32.
InTCP,aSYN+ACKsegmentconsumes_____sequencenumbers.
A)no
B)three
C)two
D)one
33.
InTCP,anACKsegment,ifcarryingnodata,consumes______sequencenumber(s).
A)no
B)one
C)two
D)Noneofthechoicesarecorrect
34.
TheconnectionestablishmentprocedureinTCPissusceptibletoaserioussecurityproblemcalledthe_________attack.
A)ACKflooding
B)FINflooding
C)SYNflooding
D)Noneofthechoicesarecorrect
35.
TheSYNfloodingattackbelongstoagroupofsecurityattacksknownasa_____attack.
A)denialofservice
B)replay
C)man-in-themiddle
D)Noneofthechoicesarecorrect
36.
InTCP,aFINsegmentconsumes____sequencenumbersifitdoesnotcarrydata.
A)two
B)three
C)no
D)one
37.
InTCP,aFIN+ACKsegmentconsumes_____sequencenumber(s)ifitdoesnotcarrydata.
A)two
B)three
C)one
D)no
38.
InTCP,oneendcanstopsendingdatawhilestillreceivingdata.Thisiscalleda______termination.
A)half-close
B)half-open
C)full-close
D)Noneofthechoicesarecorrect
39.
TCPslidingwindowsare__________oriented.
A)packet
B)segment
C)byte
D)Noneofthechoicesarecorrect
40.
InTCP,thesizeofthesendwindowisthe________ofrwndandcwnd.
A)maximum
B)sumof
C)minimum
D)Noneofthechoicesarecorrect
41.
InTCP,thewindowshouldnotbe_________.
A)opened
B)closed
C)shrunk
D)slide
42.
InTCP,thereceivercantemporarilyshutdownthewindow;thesender,however,canalwayssendasegmentof_____byte(s)afterthewindowisshutdown.
A)ten
B)zero
C)one
D)Noneofthechoicesarecorrect
43.
Aseriousproblemcanariseintheslidingwindowoperationwheneitherthesendingapplicationprogramcreatesdataslowlyorthereceivingapplicationprogramconsumesdataslowly,orboth.Thisproblemiscalledthe______.
A)sillywindowsyndrome
B)unexpectedsyndrome
C)windowbug
D)Noneofthechoicesarecorrect
44.
Nagle'salgorithmcansolvethesillywindowsyndromecreatedbythe_________.
A)sender
B)receiver
C)bothsenderandreceiver
D)Noneofthechoicesarecorrect
45.
Clark'ssolutioncansolvethesillywindowsyndromecreatedbythe_________.
A)sender
B)receiver
C)bothsenderandreceiver
D)Noneofthechoicesarecorrect
46.
Delayedacknowledgmentcansolvethesillywindowsyndromecreatedbythe_________.
A)sender
B)receiver
C)bothsenderandreceiver
D)Noneofthechoicesarecorrect
47.
InTCP,anACKsegmentsthatcarrynodataconsumes_______sequencenumber(s).
A)no
B)one
C)two
D)Noneofthechoicesarecorrect
48.
InmodernimplementationsofTCP,aretransmissionoccursiftheretransmissiontimerexpiresor________duplicateACKsegmentshavearrived.
A)one
B)two
C)three
D)Noneofthechoicesarecorrect
49.
InTCP,________retransmissiontimerissetforanACKsegment.
A)one
B)aprevious
C)no
D)Noneofthechoicesarecorrect
50.
InTCP,therecanbe______RTTmeasurement(s)inprogressatanytime.
A)two
B)onlyone
C)several
D)Noneofthechoicesarecorrect
51.
Weneedtomultiplytheheaderlengthfieldby_______tofindthetotalnumberofbytesintheTCPheader.
A)2
B)4
C)6
D)Noneofthechoicesarecorrect
52.
InTCP,urgentdatarequirestheurgentpointerfieldaswellastheURGbit(tobeset)inthe_______field.
A)control
B)offset
C)sequencenumber
D)Noneofthechoicesarecorrect
53.
InTCP,iftheACKvalueis200,thenbyte_______hasbeenreceivedsuccessfully.
A)199
B)200
C)201
D)Noneofthechoicesarecorrect
54.
InTCP,the_______timerpreventsalongidleconnectionbetweentwoTCPs.
A)retransmission
B)persistence
C)keepalive
D)Noneofthechoicesarecorrect
55.
InTCP,the_______timerisneededtohandlethezerowindow-sizeadvertisement.
A)retransmission
B)persistence
C)keepalive
D)Noneofthechoicesarecorrect
56.
InTCP,Karn'salgorithmisusedincalculationsbythe_______timer.
A)retransmission
B)persistence
C)keepalive
D)Noneofthechoicesarecorrect
57.
In
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