计算机网络英文题库(附答案)chapter1

精心整理

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

C segment

D message

13．Theprotocolsofvariouslayersarecalled().

A theprotocolstack

B TCP/IP

C ISP

D networkprotocol

14．Therearetwoclassesofpacket-switchednetworks:()netw

orksandvirtual-circuitnetworks.

A datagram

B circuit-switched

C television

D telephone

15．Accessnetworkscanbelooselyclassifiedintothreecateg

ories:residentialaccess,companyaccessand()access.

A cabled

B wireless

C campus

D cityarea

Question16～17

Suppose,a istheaveragerateatwhichpacketsarriveatthe

queue,R

han(17).

16． A LR／a

B La

C Ra

D LR

17．A 2

B 1

C 0

D -1

18．IntheInternet,theequivalentconcepttoendsystemsis().

A hosts

B servers

C clients

D routers

19．IntheInternet,endsystemsareconnectedtogetherby().

A copperwire

B coaxialcable

C communicationlinks

D fiberoptics

20．EndsystemsaccesstotheInternetthroughits().

A modems

B protocols

C ISP

D sockets

21．Endsystems,packetswitches,andotherpiecesoftheInter

net,run()thatcontrolthesendingandreceivingofinform

ationwithintheInternet.

A programs

B processes

C applications

D protocols

22．Therearemanyprivatenetworks,suchasmanycorporateand

governmentnetworks,whosehostscannotexchangemessage

24．TheInternetprovidestwoservicestoitsdistributedappl

ications:aconnectionlessunreliableserviceand()serv

ice.

A flowcontrol

B connection-orientedreliable

C congestioncontrol

D TCP

25．Itdefinestheformatandtheorderofmessagesexchangedbe

tweentwoormorecommunicatingentities,aswellastheact

ionstakenonthetransmissionand/orreceiptofamessageo

rotherevent.Thesentencedescribes().

A Internet

B protocol

C intranet

D network

26．Inthefollowingoptions,whichdoesnotdefineinprotocol

?()

A

theformatofmessagesexchangedbetweentwoormorec

ommunicatingentities

B

theorderofmessagesexchangedbetweentwoormoreco

mmunicatingentities