计算机网络英文题库附包括chapter

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Chapter2ApplicationLayer

1.Inthefollowingfourdescriptions,whichoneiscorrect?

InC/Sarchitecture,clientscommunicatewitheachotherdirectly.

InC/Sarchitecture,clienthasafixedwell-knownaddress.

InP2Parchitecture,peerscommunicatewitheachotherdirectly.

InP2Parchitecture,peerhasafixedwell-knownaddress.

2.Inthecontextofacommunicationsessionbetweenapairofprocess,theprocessthat

initiatesthecommunicationislabeledasthe,theprocessthatwaitstobecontactedto

beginthesessionislabeledasthe.

Aclientprocess,serverprocessBsendingprocess,receivingprocess

Cinputprocess,outputprocessDcommunicatingprocess,connectingprocess

3.Asocketistheinterfacebetweenwithinahost.

thenetworklayerandthelinklayer

thelinklayerandthephysicallayer

theapplicationlayerandthetransportlayer

thetransportlayerandthenetworklayer

4.Inthefollowingapplications,whichoneisaloss-tolerantapplication?

A

E-mail

B

filetransfer

C

instantmessaging

D

real-timeaudio

5.Inthefollowingapplications,whichoneisabandwidth-sensitiveapplication?

A

E-mail

B

webapplication

C

real-timeaudio

D

filetransfer

6.TheserviceofTCPcan

’tguarantee.

A

deliveryofalldatawithouterror

Bdeliveryofalldataintheproperorder

C

therateofdelivery

Dcongestioncontrol

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7.Inthefollowingapplications,whichoneusesUDP?

AE-mailBwebapplicationCfiletransferDDNS

InthefollowingdescriptionsaboutHTTP,whichoneisnotcorrect?AHTTPusesnon-persistentconnectionsinitsdefaultmode.

BHTTPusesTCPasitsunderlyingtransportprotocol.CHTTPisastatelessprotocol.

DHTTPisclient-serverarchitecture.

SupposeawebpageconsistsofabaseHTMLfile,5JEPGimagesandajavaapplet,and

alsosupposeHTTPusespersistentconnectionwithoutpipelining,thetotalresponsetime

is.

A2RTTB8RTTC12RTTD14RTT

10.InHTTPresponsemessage,iftherequestedHTTPprotocolversionisnotsupported,the

statuscodeis

.

A200

B301

C400

D505

1~5CACDC6~10CDABD

11.Theportnumberofwebapplicationis.

A25B20C80D53

12.AnetworkentitythatsatisfiesHTTPrequestsonthebehalfofanoriginwebserver

is.

AserverfarmBserverstackCproxyserverDedgeserver

Inthefollowingdescriptionsaboutpersistentconnection,whichoneisnotcorrect?ATheserverleavestheTCPconnectionopenaftersendingaresponse.

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EachTCPconnectionisclosedaftertheserversendingoneobject.

Therearetwoversionsofpersistentconnection:withoutpipeliningandwithpipelining.

ThedefaultmodeofHTTPusespersistentconnectionwithpipelining.

14.FTPusestwoparallelTCPconnectionstotransferafile,thereare.

controlconnectionanddataconnection

receivingconnectionandsendingconnection

clientconnectionandseverconnection

programconnectionandprocessconnection

15.InthefollowingdescriptionsaboutFTP,whichoneiscorrect?

A

FTPisp2parchitecture.

BFTPsendsitscontrolinformationout-of-band.

C

FTPusespersistentconnection.

DFTPisastatelessprotocol.

16.InthecommandsofFTP,whichonedoesnothaveparameter?

AUSER

BPASS

CLIST

DSTOR

17.TheInternetmailsystemhasthreecomponentswhichtheyare

.

A

useragent,SMTP,POP3

B

SMTP,POP3,IMAP

C

useragent,SMTP,IMAP

Duseragent,SMTP,mailserver

18.IfthestatuscodeinHTTPresponsemessageis404,itmeans

.

A

Requestsucceeded.

B

Therequesteddocumentdoesn

’texitonthisserver.

Thisisagenericerrorcodeindicatingthattherequestcouldnotbeunderstoodbytheserver.

Requestedobjecthasbeenpermanentlymover.

19.ComparisonHTTPwithSMTP,thecorrectis.

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HTTPisapushprotocol,andSMTPisapullprotocol.

Inthedefaultmode,bothofthemusepersistentconnection.

C

HTTPplacesallofthemessage

ts’intosobjeconmessage,andSMTPsendseveryobject

onebyone.

D

HTTPrequireseachmessagetobein7bit-ASCIIformat,andSMTPdoesn

’timposet

restriction.

20.TheheadersintheMIMEmessagemustincludeexcept

.

A

From

BContent-type

CContent-transfer-encoding

DMIME

version

11~15CCBAB

16~20DDBBD

21.Inthefollowingprotocol,whichoneisstateless?

A

POP3

BSMTP

C

FTP

DIMAP

22.DNSmeans

.

A

DataNameSystem

B

DataNationalSystem

C

DomainNameSystem

D

DomainNationalSystem

23.TherearethreeclassesofDNSserverexcept

.

A

RootDNSserver

B

LocalDNSserver

C

TLDserver

D

AuthoritativeDNSserver

24.DNSprovidessomeservicesexcept

.

A

Hostaliasing

BMailserveraliasing

C

Loaddistribution

DAsinglepointoffailure

25.TherearethreearchitecturesforlocatingcontentinP2Pfilesharing,KaZaAuses.

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CentralizedDirectory（Napster）

QueryFlooding(Gnutella)

ExploitingHeterogeneity(p141)

IncentivePriorities

26.TherearethreearchitecturesforlocatingcontentinP2Pfilesharing,Napsteruses.

CentralizedDirectory(p137)BQueryFlooding

CExploitingHeterogeneityDIncentivePriorities

27.ThefollowingarchitecturesinP2Pfilesharing,whichisanoverlaynetwork?ACentralizedDirectory

BQueryFlooding(p139)CExploitingHeterogeneityDIncentivePriorities

28.Thetimeittakesforasmallpackettotravelfromclienttoserverandthenbacktothe

clientis.

Around-traveltimeBnext-hoptime

Cround-triptimeDprefix-matchingtime

SupposeA(withaWeb-basedaccount)sendsamessagetoB(whoaccesseshismailserverusingPOP3),whichapplication-layerprotocolisnotused?

AHTTPBSMTPCPOP3DIMAP

30.Inthefourfollowingoptions,whichprotocolisincludedinMailAccessProtocol?

ASMTPBDHCPCIMAPDFTP

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31.

InFTPcommands,

isusedtosenduserpasswordtotheserver.

A

User

BPass

CRetr

DStor

32.

ThefunctionoftheadditionalheaderfieldinMIMEContent-Typeis

.

toconvertthemessagebodytoitsoriginnon-ASCIIform

todeterminewhatactionsitshouldtakeonmessagebody

tosendanE-mailtothereceivinguseragent

toindicatewhattypethemessageis

Inthefourfollowingoptions,whichapplicationisorganizedashybridofC/SandP2Parchitecture?

AE-mailBOICQCFiletransferDWebapplication

Inthefourfollowingoptions,whichisnotacentralizedDNSdesign’sproblem?Aasinglepointoffailure

Btrafficvolume

CdistantcentralizeddatabaseDslow(maintenance)

Inthefollowingoptions,fromtheapplicationdeveloper’perspective,whichisnotcorrect?

Athenetworkarchitectureisfixed

BthenetworkarchitectureprovidesaspecificsetofservicestoapplicationsCtheapplicationarchitectureisdesignedbythephysicaldevices

Dtheapplicationarchitecturedictateshowtheapplicationisorganizedoverthevariousendsystems

Therearethreepredominantarchitecturesusedinmodernnetworkapplications,which

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oneisnotincluded?

Atheclient-serverarchitectureBtheP2Parchitecture

ahybridoftheclient-serverandP2Parchitecture

ahybridoftheclient-serverandbrowser-serverarchitecture

InthefollowingoptionsaboutC/Sarchitecture,whichisnotcorrect?AInC/Sarchitecture,thereisanalways-onhost,calledtheserver.

BInC/Sarchitecture,thereisanalways-onhost,calledtheclient.CTheserverhasafixed,well-knownaddress,calledIPaddress.DClientsdonotdirectlycommunicatewitheachother.

areoftenusedtocreateapowerfulvirtualserverinC/Sarchitecture.

APeersBServerfarmCserverstackDlocalserver

39.Aprocesssendsmessagesinto,andreceivesmessagesfrom,thenetworkthrough

its.

AsocketBprogramCclientDpeer

Whichoneisnotdefinedbyanapplication-layerprotocol?Athetypesofmessagesexchanged

BthesyntaxofvariousmessagetypesCthesemanticsofthefields

Drulesfordeterminingwhenandhowtotranslatethesocket

41.HTTPcanusetwotypesofconnections,whichare.

persistentandnon-persistentconnection

connectionwithpipeliningandwithoutpipelining

TCPandUDP

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Dparallelandserialconnection

42.takesforasmallpackettotravelfromclienttoserverandthenbacktotheclient.

ARDTBthresholdCRTTDoverhead

43.ThedefaultmodeofHTTPuses.

non-persistentconnectionwithpipelining

non-persistentconnectionwithoutpipelining

persistentconnectionwithpipelining

persistentconnectionwithoutpipelining

44.InHTTPrequestmessages,therequestlinehasthreefields,thereare.

themethodfield,theURLfieldandtheHTTPversionfield

themethod,theconnectionandURLfield

theuser-agent,themethodandHTTPversionfield

theuser-agent,theURLandtheHTTPversionfield

45.IntheheaderlinesofHTTPrequestmessage,ifthefieldofConnectionisclose,it

specifies.

thehostonwhichobjectresides

whattypeoftheuseragent

thatthebrowserwantstheservertoclosetheconnectionaftersendingtherequestedobject

whichlanguagecanthebrowserreceive

46.InHTTPresponsemessage,ifthestatuscodeis404,itmeans.

requestsucceededandtheinformationisreturnedintheresponse

requestedobjecthasbeenpermanentlymoved

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therequestedHTTPprotocolversionisnotsupportedbytheserver

therequesteddocumentdoesnotexistonthisserver

47.isanetworkentitythatsatisfiesHTTPrequestsonthebehalfofanoriginWeb

server.

AproxyserverBlocalserverCDNSserverDWebserver

Inthefollowingfouroptionsaboutwebcache,whichoneisnotcorrect?AAwebcacheisbothaserverandaclientatthesametime.

BAwebcacheispurchasedandinstalledbyanISP.

CAwebcachecanraisetheresponsetimeforaclientrequest.

DAwebcachecanreducetrafficonaninstitution

’saccesslinktotheIntern

49.

TherequestmessageintheconditionalGETmustincludethe

headerline.

A

Last-Modified

B

Last-Referenced

C

If-Modified-Since

D

If–Referenced-Since

50.

FTPusestwoparallelconnectionstotransferafile,theyare

.

TCPandUDPconnection

connectionwithpipeliningandwithoutpipelining

controlandataconnection

client-serverandbrowser-serverconnection

InFTPcommands,whichoneisusedtoasktheservertosendbackalistofallfilesinthecurrentremotedirectory?

AUSERBPASSCLISTDRETR

52.IntheInternetmailsystem,allowuserstoread,replyto,forward,saveand

composemessage.

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AUseragentsBmailserversCSMTPDTCP

53.ThetwokeyMIMEheadersforsupportingmultimediaare.

Content-TypeandMIME-Version

Content-TypeandContent-Transfer-Encoding

Content-Transfer-EncodingandMIME-Version

MIME-VersionandMIME-Type

54.ForInternetmail,themailaccessprotocolisusedto.

Atransfermailfromtherecipient’smailservertotherecipient

Btransfermailfromthesender’smailservertotherecipient

Ctranslatethemailfromthesender’smailserver

Dtranslatethemailintotherecipientmailserver’s

55.POP3progressesthroughthreephases,whichtheyare.

authorization,translationandtransaction

authorization,translationandupdate

authorization,transactionandupdate

translation,transactionandupdate

56.Inthefollowingfourservices,whichonecannotprovidebyDNS?

AHostaliasingBMailserveraliasing

translatehostnametoIPaddresses

translateMACaddressestoIPaddresses

57.TherearethreeclassesofDNSservers,thereare.

rootDNSserver,top-leveldomainDNSserverandlocalDNSserver

rootDNSserver,top-leveldomainDNSserverandauthoritativeDNSserver

’suse’smailse

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rootDNSserver,localDNSserverandauthoritativeDNSserver

rootDNSserver,localDNSserverandtop-leveldomainDNSserver

58.InthefollowingfouroptionsaboutPOP3,whichoneisnotcorrect?

Theuseragentemployedonlythreecommands:List,RetrandQuit

TheserverdoesnotcarrystateinformationacrossPOP3sessions

Theportnumberis110

ThePOP3protocoldoesnotprovideanymeansforausertocreateremotefoldersandassignmessagestofolders.

59.AresourcerecordinDNSdistributeddatabaseisafour-tuple,whichfieldcanbeignored?

(p132)ANameBValueCTypeDTTL

InthefollowingfouroptionsaboutDNSresourcerecord,whichoneiscorrect?

AThemeaningofNameandValuedependonType.BThemeaningofValueandTypedependonName.

CIfType=A,thenNameisadomainandValueistheIPaddressforthehostname.DIfType=MX,thenNameisdomainandValueistheIPaddressforthehostname.

InthefollowingfouroptionsaboutDNSmessages,whichoneisnotcorrect?

ThereareonlytwokindsofDNSmessage.(p133)

Bothqueryandreplymessagehavethesameformat.

TheheadersectioninDNSmessagehas12bytes.

Theauthoritysectioncontainstheresourcerecordsforthesamethatwasoriginallyqueried

.

62.InDNSmessage,containsinformationaboutthequerythatisbeingmade.(p133)

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AauthoritysectionBquestionsectionCanswersectionDadditionalsection

TherearethreetechniquesareemployedinmostanyP2Pfile-sharingsystems,whichoneisnotinclude?（p144）

ARequestqueuingBincentiveprioritiesCparalleldownloadingDResponsequeuing

InthefollowingfouroptionsaboutP2Pfile-sharing,whichoneisnotcorrect?AP2Pfile-sharingishighlyscalable.

BP2Pfile-sharingreliesonP2Parchitecture.

CThemeansforlocatingcontentindifferentP2Pfile-sharingaredifferent.

DP2Pfile-sharingsystemsnotonlyshareMP3s,butalsovideos,software,documentsandimages.

65.InMIMEheaderlines,specifiesthenameoftheSMTPserverthatsentthemessage(from),

thenameoftheSMTPserverthatreceivedthemessage(by),andthetimeanwhichthereceiv

ingserverreceivedthemessage.

AReceivedBFromCToDMIME-Version

66.IftheheaderlineConnectionisclose,itmeansthattheclientwants.

persistentconnectionwithpipelining

persistentconnectionwithoutpipelining

nonpersistentconnection

notconnection

67.InHTTPrequestmessage,theentitybodyisemptywiththemethod,butisused

withthemethod.

AGET,POSTBPOST,GETCGET,HEADDPOST,HEAD

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68.InHTTPresponsemessage,iftheDate:header;oneindicatesthetimeFri.08Aug.2008

12:00:00GMT,theLast-Modified:headerlinecannotbe.

AFri.08Aug.200811:00:00GMTBFri.08Aug.200811:30:00GMT

CFri.08Aug.200812:00:00GMTDFri.08Aug.200812:30:00GMT

Inthefollowingfouroptions,whichoneisnotthepartofcookietechnology?ACookieheaderlinesintheHTTPresponsemessageandrequestmessage.

BOnecookieheaderfilekeptontheuser’sendsystemandmanagedbytheuser’browser.CAnetworkentitythatsatisfiesHTTPrequestsonthebehalfofanoriginWebserver.

DAback-enddatabaseattheWebsite

70.

On-topofstatelessHTTP,

canbeusedtocreateausersessionlayer.

A

proxyserver

B

Webcache

C

cookie

D

socket

71.

Processescommunicatewitheachotherbyreadingfromandwritingto

.

A

programs

B

threads

C

sockets

D

channels

Inthefollowingfouroptionsaboutnetworkarchitecture,whichoneisnotcorrect?AThenetworkarchitectureisfixed.

BThenetworkarchitectureprovidesaspecificsetofservicestoapplication.CThenetworkarchitectureisdesignedbyapplicationdeveloper.

DThenetworkarchitecturedictateshowtheapplicationisorganizedoverspecialserver.

73.InClient-Serverarchitecture,theclientsvisittheserver’sthrough

.

A

client’ssocket

B

client’sIPaddress

C

server’ssocket

D

server’sIPaddress

74.

canbethoughtofasaprogramthatisrunningwithinendsystem.

A

process

Bthread

C

socket

D

context

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75.APImeans.

AApplicationProgramInterfaceBApplicationProcessInterface

CAppellationProgramInterfaceDAppellationProcessInterface

Onehostcanberunningmanynetworkapplications,sothesystemassignsthemdifferenttodistinguisheachother.

AIPaddressBportnumberChostnameDsection

Inthefollowingfourapplications,whichoneisbothbandwith-sensitiveandrequiretighttimingconstraints?

A

real-timeaudio

Bfiletransfer

C