计算机网络英文题库Word下载.docx
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计算机网络英文题库Word下载.docx
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A0,1023
B0,65535
C0,127
D0,255
8.Theportnumbersrangingfrom____to____arecalledwell-knownportnumberandarerestricted.
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
B
C
D
13.
with
bit
errors
and
packet
losses
is
____.
14.
Which
of
the
following
about
not
correct?
:
assuming
ACK
NAK
will
be
corrupted
can
only
use
ACK-s
both
NAK-s
15.
protocols
pipelining
protocols?
TCP
GO-BACK-N
D
selective
repeat
16.
correct
GBN
protocol?
Only
using
Using
cumulative
Receiver
discards
all
out-of-order
packets
It
pipelined
17.
SR
receiver
individually
acknowledges
correctly
received
sender
resends
for
which
limits
sequence
number
sent
but
un-ACK-ed
protocol
18.WhichofthefollowingaboutTCPconnectionisnotcorrect?
AItisabroadcastconnection
BItisapoint-to-pointconnection
CItisapipelinedconnection
DItisafullduplexconnection
19.TheSYNsegmentisusedfor____.
ATCPconnectionsetup
BTCPflowcontrol
CTCPcongestioncontrol
DClosingaTCPconnection
20.TheFINsegmentisusedfor____.
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____.
A011
B100
C111
D000
26.Themaximumamountofdatathatcanbegrabbedandplacedinasegmentislimitedbythe____.
AMaximumsegmentsize(MSS)
BMTU
CChecksum
DSequencenumber
27.TheMSSistypicallysetbyfirstdeterminingthelengthofthelargestlink-layerframethatcanbesentbythelocalsendinghost----theso-called____.
AMaximumtransmissionunit(MTU)
BMSS
28.AFilesizeof500,000bytes,MSSequals1000bytes.WhenwewanttotransmitthisfilewithTCP,thesequencenumberofthefirstsegmentis0,andthesequencenumberofthesecondsegmentis____.
A1000
B999
C1001
D500000
29.BecauseTCPonlyacknowledgesbytesuptothefirstmissingbyteinthestream,TCPissaidtoprovide____.
ACumulativeacknowledgements
BSelectiveacknowledgements
C3duplicateACKs
DpositiveACKs
30.Providedα=,currentvalueofEstimated-RTTis,Sample-RTTis,thenthenewvalueofEstimated-RTTis____s.
A
B
C
D
31.ProvidedRcvBuffer=20,LastByteRcvd=20,LastByteRead=15,thenRcvWindow=____.
A14
B15
C16
D10
32.TCPservicedoesnotprovide____.
AReliabledatatransferBFlowcontrol
CDelayguaranteeDCongestioncontrol
33.TherearetwostatesinTCPcongestioncontrol,whichare____.
Aslowstartandcongestionavoidance
Bsafestartandcongestionavoidance
Cslowstartandcongestionabandon
Dsafestartandcongestionabandon
34.Thetransport-layerprotocolprovideslogicalcommunicationbetween____,andthenetwork-layerprotocolprovideslogicalcommunication____.
Ahosts,processes
Bprocesses,hosts
Cthreads,processes
Dprocesses,threads
35.
To
implement
multicast
services
Internet
employs
____
protocol.
FTP
TCP
IGMP
UDP
36.Ifanapplicationdeveloperchooses____protocol,thentheapplicationprocessisalmostdirectlytalkingwithIP.
AHTTP
BRIP
CCSMA/CD
DUDP
37.____maintainsconnection-stateintheendsystems.Thisconnectionstateincludesreceiveandsendbuffers,congestion-controlparameters,andsequenceandacknowledgmentnumberparameters.
AUDPBTCPCDNSDHTTP
38.ThehostthatinitiatesthesessionintheInternetislabeledas____.
AserverBuseragentCclientDrouter
39.WithTCPthereisno_____betweensendingandreceivingtransport-layerentities.
AflowcontrolBhandshaking
C.congestioncontrolDVCsetup
40.TheInternet’s____servicehelpspreventtheInternetfromenteringastateofgridlock.
AdatagramBcongestioncontrol
CslidingwindowDtimeoutevent
41.Connectionsetupatthetransportlayerinvolves____.
AserverBonlythetwoendsystems
CclientDrouter
42.A____layerprotocolprovidesforlogicalcommunicationbetweenapplications.
Atransport
Bapplication
Cnetworking
DMAC
43.Instaticcongestionwindow,ifitsatisfiesW*S/R>
RTT+S/R,theLatencyis____.
AW*S/R–(RTT+S/R)
B2RTT+O/R
C2RTT+O/R+(k-1)[W*S/R-(RTT+S/R)]
D2RTT+S/R
44.Thereceivesideoftransportlayerreassemblessegmentsintomessages,passesto____layer.
AApplication
BNetworking
CPhysical
45.Inthefollowingfouroptions,whichoneiscorrect?
AThevariationsintheSampleRTTaresmoothedoutinthecomputationoftheEstimatedRTT
BThetimeoutshouldbelessthantheconnection’sRTT
CSupposethatthelastSampleRTTinaTCPconnectionisequalto1sec.ThenthecurrentvalueofTimeoutIntervalwillnecessarilybe≥1sec
DSupposethatthelastSampleRTTinaTCPconnectionisequalto1sec.ThenthecurrentvalueofTimeoutIntervalwillnecessarilybe≤1sec
46.TheportnumberusedbyHTTPis____.
A80
B25
C110
D53
47.TheportnumberusedbySMTPis____.
48.Theportnumberusedbypop3is____.
49.TheportnumberusedbyDNSis____.
50.TheportnumberusedbyFTPis____.
A20and21
B20
C21
51.AUDPsocketidentifiedbya____tuple(s).
A2
B4
C1
D3
52.ATCPsocketidentifiedbya____tuple(s).
53.ATCPsocketdoesnotinclude____.
ASourceMACaddress
BSourceportnumber
CDestinationIPaddress
DDestinationportnumber
54.WhichoffollowingaboutUDPisnotcorrect.
AItisareliabledatatransferprotocol
BItisconnectionless
CnohandshakingbetweenUDPsender,receiver
Ditisabesteffortserviceprotocol
55.DNSuses____service.
ATCP
BUDP
CBothTCPandUDP
DNoneofabove
56.WhichoffollowingaboutUDPiscorrect?
AFinerapplication-levelcontroloverwhatdataissent,andwhen
BNoconnectionestablishment(whichcanadddelay),sonodelayforestablishaconnection
CNoconnectionstate(so,UDPcantypicallysupportmanyactiveclients)
DLargepacketheaderoverhead(16-B)
57.Streamingmediausesa____servicenormally.
58.TheUDPheaderhasonly____fields.
59.WhichofthefollowingdoesnotincludedinUDPheader.
ASourceportnumber
BDestinationportnumber
60.Whichofthefollowingisnotapipeliningprotocol.
BGo-Back-N
CSelectiverepeat
DTCP
61.InthefollowingfourdescriptionsaboutMSSandMTU,whichoneisnotcorrect?
ATheMSSisthemaximumamountofapplication-layerdatainthesegment
BTheMSSisthemaximumsizeoftheTCPsegmentincludingheaders
CTheMSSistypicallysetbyMTU
DTheMTUmeansthelargestlink-layerframe
62.Thejobo
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