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Chapter1ComputerNetworksandtheInternet
1．The()isaworldwidecomputernetwork,thatis,anetworktha
tinterconnectsmillionsofcomputingdevicesthroughoutt
heworld.ppt3
A publicInternet
B Intranet
C switchnet
D televisionnet
2．Whichkindofmediaisnotaguidedmedia?()
A twisted-paircopperwire
B acoaxialcable
C fiberoptics
D digitalsatellitechannel
3．Whichkindofmediaisaguidedmedia?()
A geostationarysatellite
B low-altitudesatellite
C fiberoptics
D wirelessLAN
4．
ed().
A Frames
B Segments
C Datagrams
D bitstreams
5．
A
B
C
D
6．()makessurethatneithersideofaconnectionoverwhelmsth
eothersidebysendingtoomanypacketstoofast.
A Reliabledatatransfer
B Flowcontrol
C Congestioncontrol
D Handshakingprocedure
7．()meansthattheswitchmustreceivetheentirepacketbefor
eitcanbegintotransmitthefirstbitofthepacketontotheo
utboundlink.
A Store-and-forwardtransmission
B FDM
C End-to-endconnection
D TDM
8．Datagramnetworksandvirtual-circuitnetworksdifferint
hat().
A
datagramnetworksarecircuit-switchednetworks,a
ndvirtual-circuitnetworksarepacket-switchednetwo
rks.
B
datagramnetworksarepacket-switchednetworks,an
dvirtual-circuitnetworksarecircuit-switchednetwo
rks.
D satellite
10．Processingdelaydoesnotincludethetimeto().
A examinethepacket’sheader
B waittotransmitthepacketontothelink
C determinewheretodirectthepacket
D checkbit-errorinthepacket
11．Inthefollowingfourdescriptions,whichoneiscorrect?()
A Thetrafficintensitymustbegreaterthan1.
B
Thefractionoflostpacketsincreasesasthetraffic
intensitydecreases.
C
Ifthetrafficintensityisclosetozero,theaverage
queuingdelaywillbeclosetozero.
D
Ifthetrafficintensityisclosetoone,theaverageq
ueuingdelaywillbeclosetoone.
12．TheInternet’snetworklayerisresponsibleformovingne
twork-layerpacketsknownas()fromonehosttoanother.
A frame
B datagram
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