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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.
InTCP,aspecialsegmentcalledaprobeissentbyasendingTCPwhenthe_______timergoesoff.
A) transmission
B) persistence
C) keepalive
D) Noneofthechoicesarecorrect
58.
__________controlreferstothemechanismsandtechniquestokeeptheloadbelowthecapacity.
A) flow
B) error
C) congestion
D) Noneofthechoicesarecorrect
59.
InTCP's________algorithmthesizeofthecongestionwindowincreasesexponentiallyuntilitreachesathreshold.
A) congestionavoidance
B) congestiondetection
C) slowstart
D) Noneofthechoicesarecorrect
60.
InTCP's__________algorithmthesizeofthecongestionwindowincreasesadditivelyuntilcongestionisdetected.
A) congestionavoidance
B) congestiondetection
C) slowstart
D) Noneofthechoicesarecorrect
61.
________treatsthetwosignsofcongestiondetections,timeoutandthreeduplicateACKs,inthesameway.
A) TahoTCP
B) RenoTCP
C) newRenoTCP
D) Noneofthechoicesarecorrect
62.
In______TCP,whentheconnectionisestablished,TCPstartstheslowstartalgorithmsandsetsthessthreshvariabletoapre-agreedvalue(normally64or128kilobytes)andthecwndvariableto1MSS.
A) TahoTCP
B) RenoTCP
C) newRenoTCP
D) Noneofthechoicesarecorrect
63.
The___________addedanewstatetothecongestioncontrolFSM,calledthefastrecoverystate.
A) TahoTCP
B) RenoTCP
C) newRenoTCP
D) Noneofthechoicesarecorrect
64.
The___________treatedthetwosignalsofcongestion,timeoutandarrivalofthreeduplicateACKs,differently.
A) TahoTCP
B) RenoTCP
C) newRenoTCP
D) Noneofthechoicesarecorrect
65.
The__________stateinRenoTCPisastatesomehowbetweentheslowstartandthecongestionavoidancestates.
A) congestionavoidance
B) congestiondetection
C) slowrecovery
D) Noneofthechoicesarecorrect
66.
IntheRenoTCP,whenTCPentersthefastrecovery,ifduplicateACKscontinuetocome,TCP____________________________________.
A) staysinthisstate,butthecwndgrowsadditively
B) staysinthisstate,butthecwndgrowsexponentially
C) movestoslowstartstate
D) movestothecongestionavoidancestatebutdeflatethesizeofthecwndtossthreshvalue
67.
IntheRenoTCP,whenTCPentersthefastrecovery,ifatimeoutoccurs,TCP____________________________________.
A) staysinthisstate,butthecwndgrowsadditively
B) staysinthisstate,butthecwndgrowsexponentially
C) movestoslowstartstate
D) movestothecongestionavoidancestatebutdeflatethesizeofthecwndtossthreshvalue
68.
IntheRenoTCP,whenTCPentersthefastrecovery,ifanew(nonduplicate)ACKarrivesTCP____________________________________.
A) staysinthisstate,b
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