计算机网络英文题库附答案chapter2.docx

计算机网络英文题库附答案chapter2.docx

《计算机网络英文题库附答案chapter2.docx》由会员分享，可在线阅读，更多相关《计算机网络英文题库附答案chapter2.docx（18页珍藏版）》请在冰点文库上搜索。

计算机网络英文题库附答案chapter2

Chapter2ApplicationLayer

1.Inthefollowingfourdescriptions,whichoneiscorrect

AInC/Sarchitecture,clientscommunicatewitheachotherdirectly.

BInC/Sarchitecture,clienthasafixedwell-knownaddress.

CInP2Parchitecture,peerscommunicatewitheachotherdirectly.

DInP2Parchitecture,peerhasafixedwell-knownaddress.

2.Inthecontextofacommunicationsessionbetweenapairofprocess,theprocessthatinitiatesthecommunicationislabeledasthe,theprocessthatwaitstobecontactedtobeginthesessionislabeledasthe.

Aclientprocess,serverprocessBsendingprocess,receivingprocess

Cinputprocess,outputprocessDcommunicatingprocess,connectingprocess

3.Asocketistheinterfacebetweenwithinahost.

《

Athenetworklayerandthelinklayer

Bthelinklayerandthephysicallayer

Ctheapplicationlayerandthetransportlayer

Dthetransportlayerandthenetworklayer

4.Inthefollowingapplications,whichoneisaloss-tolerantapplication

AE-mailBfiletransferCinstantmessagingDreal-timeaudio

5.Inthefollowingapplications,whichoneisabandwidth-sensitiveapplication

AE-mailBwebapplicationCreal-timeaudioDfiletransfer

6.TheserviceofTCPcan’tguarantee.

AdeliveryofalldatawithouterrorBdeliveryofalldataintheproperorder

…

CtherateofdeliveryDcongestioncontrol

7.Inthefollowingapplications,whichoneusesUDP

AE-mailBwebapplicationCfiletransferDDNS

8.InthefollowingdescriptionsaboutHTTP,whichoneisnotcorrect

AHTTPusesnon-persistentconnectionsinitsdefaultmode.

BHTTPusesTCPasitsunderlyingtransportprotocol.

CHTTPisastatelessprotocol.

DHTTPisclient-serverarchitecture.

9.SupposeawebpageconsistsofabaseHTMLfile,5JEPGimagesandajavaapplet,andalsosupposeHTTPusespersistentconnectionwithoutpipelining,thetotalresponsetimeis.

A2RTTB8RTTC12RTTD14RTT

]

10.InHTTPresponsemessage,iftherequestedHTTPprotocolversionisnotsupported,thestatuscodeis.

A200B301C400D505

1~5    CACDC           6~10  CDABD

11.Theportnumberofwebapplicationis.

A25B20C80D53

12.AnetworkentitythatsatisfiesHTTPrequestsonthebehalfofanoriginwebserveris.

AserverfarmBserverstackCproxyserverDedgeserver

13.Inthefollowingdescriptionsaboutpersistentconnection,whichoneisnotcorrect

ATheserverleavestheTCPconnectionopenaftersendingaresponse.

%

BEachTCPconnectionisclosedaftertheserversendingoneobject.

CTherearetwoversionsofpersistentconnection:

withoutpipeliningandwithpipelining.

DThedefaultmodeofHTTPusespersistentconnectionwithpipelining.

14.FTPusestwoparallelTCPconnectionstotransferafile,thereare.

Acontrolconnectionanddataconnection

Breceivingconnectionandsendingconnection

Cclientconnectionandseverconnection

Dprogramconnectionandprocessconnection

15.InthefollowingdescriptionsaboutFTP,whichoneiscorrect

AFTPisp2parchitecture.BFTPsendsitscontrolinformationout-of-band.

，

CFTPusespersistentconnection.DFTPisastatelessprotocol.

16. In the commands of FTP, which one does not have parameter 

 A  USER           B  PASS             C  LIST            D  STOR

17.TheInternetmailsystemhasthreecomponentswhichtheyare.

Auseragent,SMTP,POP3BSMTP,POP3,IMAP

Cuseragent,SMTP,IMAPDuseragent,SMTP,mailserver

18.IfthestatuscodeinHTTPresponsemessageis404,itmeans.

ARequestsucceeded.

BTherequesteddocumentdoesn’texitonthisserver.

CThisisagenericerrorcodeindicatingthattherequestcouldnotbeunderstoodbytheserver.

？

DRequestedobjecthasbeenpermanentlymover.

19.ComparisonHTTPwithSMTP,thecorrectis.

AHTTPisapushprotocol,andSMTPisapullprotocol.

BInthedefaultmode,bothofthemusepersistentconnection.

CHTTPplacesallofthemessage’sobjectsintoonemessage,andSMTPsendseveryobjectonebyone.

DHTTPrequireseachmessagetobein7-bitASCIIformat,andSMTPdoesn’timposethisrestriction.

20.TheheadersintheMIMEmessagemustincludeexcept.

AFromBContent-typeCContent-transfer-encodingDMIMEversion

11~15CCBAB          16~20  DDBBD

—

21.Inthefollowingprotocol,whichoneisstateless

APOP3BSMTPCFTPDIMAP

22.DNSmeans.

ADataNameSystemBDataNationalSystem

CDomainNameSystemDDomainNationalSystem

23.TherearethreeclassesofDNSserverexcept.

ARootDNSserverBLocalDNSserver

CTLDserverDAuthoritativeDNSserver

24.DNSprovidessomeservicesexcept.

AHostaliasingBMailserveraliasing

；

CLoaddistributionDAsinglepointoffailure

25. There are three architectures for locating content in P2P file sharing, KaZaA uses       . 

A  Centralized Directory （Napster）             

B  Query Flooding（Gnutella）

C  Exploiting Heterogeneity （p141）           

D  Incentive Priorities 

26. There are three architectures for locating content in P2P file sharing, Napster uses       .

 A  Centralized Directory （p137）              

B  Query Flooding 

C  Exploiting Heterogeneity            

#

D  Incentive Priorities

27. The following  architectures in P2P file sharing, which is an overlay network  

A  Centralized Directory             

B  Query Flooding（p139） 

C  Exploiting Heterogeneity            

D  Incentive Priorities 

28.Thetimeittakesforasmallpackettotravelfromclienttoserverandthenbacktotheclientis.

Around-traveltimeBnext-hoptime

Cround-triptimeDprefix-matchingtime

29.SupposeA（withaWeb-basede-mailaccount）sendsamessagetoB（whoaccesseshismailserverusingPOP3）,whichapplication-layerprotocolisnotused

.

AHTTPBSMTPCPOP3DIMAP

30.Inthefourfollowingoptions,whichprotocolisincludedinMailAccessProtocol

ASMTPBDHCPCIMAPDFTP

31.InFTPcommands,isusedtosenduserpasswordtotheserver.

AUserBPassCRetrDStor

32.ThefunctionoftheadditionalheaderfieldinMIMEContent-Typeis.

Atoconvertthemessagebodytoitsoriginnon-ASCIIform

Btodeterminewhatactionsitshouldtakeonmessagebody

CtosendanE-mailtothereceivinguseragent

Dtoindicatewhattypethemessageis

（

33.Inthefourfollowingoptions,whichapplicationisorganizedashybridofC/SandP2Parchitecture

AE-mailBOICQCFiletransferDWebapplication

34. In the four following options, which is not a centralized DNS design’s problem  

A  a single point of failure    

B  traffic volume 

C  distant centralized database         

 D  slow   （maintenance）

35.Inthefollowingoptions,fromtheapplicationdeveloper’sperspective,whichisnotcorrect

Athenetworkarchitectureisfixed

Bthenetworkarchitectureprovidesaspecificsetofservicestoapplications

—

Ctheapplicationarchitectureisdesignedbythephysicaldevices

Dtheapplicationarchitecturedictateshowtheapplicationisorganizedoverthevariousendsystems

36.Therearethreepredominantarchitecturesusedinmodernnetworkapplications,whichoneisnotincluded

Atheclient-serverarchitectureBtheP2Parchitecture

Cahybridoftheclient-serverandP2Parchitecture

Dahybridoftheclient-serverandbrowser-serverarchitecture

37.InthefollowingoptionsaboutC/Sarchitecture,whichisnotcorrect

AInC/Sarchitecture,thereisanalways-onhost,calledtheserver.

BInC/Sarchitecture,thereisanalways-onhost,calledtheclient.

CTheserverhasafixed,well-knownaddress,calledIPaddress.

】

DClientsdonotdirectlycommunicatewitheachother.

38.        are  often used to create a powerful virtual server in C/S architecture. 

A  Peers           B  Server farm           C  server stack     D  local server

39.Aprocesssendsmessagesinto,andreceivesmessagesfrom,thenetworkthroughits.

AsocketBprogramCclientDpeer

40.Whichoneisnotdefinedbyanapplication-layerprotocol

Athetypesofmessagesexchanged

Bthesyntaxofvariousmessagetypes

Cthesemanticsofthefields

Drulesfordeterminingwhenandhowtotranslatethesocket

！

41.HTTPcanusetwotypesofconnections,whichare.

Apersistentandnon-persistentconnection

Bconnectionwithpipeliningandwithoutpipelining

CTCPandUDP

Dparallelandserialconnection

42.takesforasmallpackettotravelfromclienttoserverandthenbacktotheclient.

ARDTBthresholdCRTTDoverhead

43.ThedefaultmodeofHTTPuses.

Anon-persistentconnectionwithpipelining

Bnon-persistentconnectionwithoutpipelining

>

Cpersistentconnectionwithpipelining

Dpersistentconnectionwithoutpipelining

44.InHTTPrequestmessages,therequestlinehasthreefields,thereare.

Athemethodfield,theURLfieldandtheHTTPversionfield

Bthemethod,theconnectionandURLfield

Ctheuser-agent,themethodandHTTPversionfield

Dtheuser-agent,theURLandtheHTTPversionfield

45.IntheheaderlinesofHTTPrequestmessage,ifthefieldofConnectionisclose,itspecifies.

Athehostonwhichobjectresides

Bwhattypeoftheuseragent

'

Cthatthebrowserwantstheservertoclosetheconnectionaftersendingtherequestedobject

Dwhichlanguagecanthebrowserreceive

46.InHTTPresponsemessage,ifthestatuscodeis404,itmeans.

Arequestsucceededandtheinformationisreturnedintheresponse

Brequestedobjecthasbeenpermanentlymoved

CtherequestedHTTPprotocolversionisnotsupportedbytheserver

Dtherequesteddocumentdoesnotexistonthisserver

47.isanetworkentitythatsatisfiesHTTPrequestsonthebehalfofan