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