复习题Word格式.docx

复习题Word格式.docx

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AE-mailBfiletransferCinstantmessagingDreal-timeaudio

5.Inthefollowingapplications,whichoneisabandwidth-sensitiveapplication

AE-mailBwebapplicationCreal-timeaudioDfiletransfer

6.TheserviceofTCPcan’tguarantee.

AdeliveryofalldatawithouterrorBdeliveryofalldataintheproperorder

CtherateofdeliveryDcongestioncontrol

7.Inthefollowingapplications,whichoneusesUDP（UserDatagramProtocol用户数据报协议）

AE-mailBwebapplicationCfiletransferDDNSDomainNameServer,域名服务器

8.InthefollowingdescriptionsaboutHTTP（HypertextTransferProtocol）,whichoneisnotcorrect

AHTTPusesnon-persistentconnectionsinitsdefaultmode.超文本传输协议使用非持久连接的默认模式。

BHTTPusesTCPasitsunderlyingtransportprotocol.超文本传输协议使用协议作为底层传输协议

CHTTPisastatelessprotocol.是一种无状态协议

DHTTPisclient-serverarchitecture.

10.InHTTPresponsemessage,iftherequestedHTTPprotocolversionisnotsupported,thestatuscodeis.

A200B301C400D505

11.Theportnumberofwebapplicationis.

A25B20C80D53

12.AnetworkentitythatsatisfiesHTTPrequestsonthebehalfofanoriginwebserveris.

AserverfarmBserverstackCproxyserver（代理服务器）Dedgeserver

13.Inthefollowingdescriptionsaboutpersistentconnection持久连接,whichoneisnotcorrect

ATheserverleavestheTCPconnectionopenaftersendingaresponse.

BEachTCPconnectionisclosedaftertheserversendingoneobject.

CTherearetwoversionsofpersistentconnection:

withoutpipeliningandwithpipelining.

DThedefaultmodeofHTTPusespersistentconnectionwithpipelining.

14.FTP（FileTransferProtocol文件传送[输]协议）usestwoparallelTCPconnectionstotransferafile,thereare.

Acontrolconnectionanddataconnection

Breceivingconnectionandsendingconnection

Cclientconnectionandseverconnection

Dprogramconnectionandprocessconnection

15.InthefollowingdescriptionsaboutFTP,whichoneiscorrect

AFTPisp2parchitecture.BFTPsendsitscontrolinformationout-of-band.服务器发送的控制信息带

CFTPusespersistentconnection.DFTPisastatelessprotocol.

17.TheInternetmailsystemhasthreecomponentswhichtheyare.

Auseragent,SMTP,POP3BSMTP,POP3,IMAPInternetMessageAccessProtocol消息访问协议

Cuseragent,SMTP,IMAPDuseragent,SMTP（SimpleMessageTransferProtocol简单邮件传输协议）,mailserver

18.IfthestatuscodeinHTTPresponsemessageis404,itmeans.

ARequestsucceeded.

BTherequesteddocumentdoesn’texitonthisserver.

CThisisagenericerrorcodeindicatingthattherequestcouldnotbeunderstoodbytheserver.

DRequestedobjecthasbeenpermanentlymover.

19.ComparisonHTTPwithSMTP,thecorrectis.

AHTTPisapushprotocol,andSMTPisapullprotocol.

BInthedefaultmode,bothofthemusepersistentconnection.

CHTTPplacesallofthemessage’sobjectsintoonemessage,andSMTPsendseveryobjectonebyone.

DHTTPrequireseachmessagetobein7-bitASCIIformat,andSMTPdoesn’timposethisrestriction.

21.Inthefollowingprotocol,whichoneisstateless

APOP3和HTTPBSMTPCFTPDIMAP

22.DNSmeans.

ADataNameSystemBDataNationalSystem

CDomainNameSystem域名服务器DDomainNationalSystem

23.TherearethreeclassesofDNSserverexcept.

ARootDNSserverBLocalDNSserver

CTLDserverDAuthoritativeDNSserver

24.DNSprovidessomeservicesexcept.

AHostaliasingBMailserveraliasing

CLoaddistributionDAsinglepointoffailure

28.Thetimeittakesforasmallpackettotravelfromclienttoserverandthenbacktotheclientis.

Around-traveltimeBnext-hoptime

Cround-triptime往返时间Dprefix-matchingtime

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

AHTTPBSMTPCPOP3DIMAP

30.Inthefourfollowingoptions,whichprotocolisincludedinMailAccessProtocol

ASMTPBDHCPCIMAPDFTP

31.InFTPcommands,isusedtosenduserpasswordtotheserver.

AUserBPassCRetrDStor

32.ThefunctionoftheadditionalheaderfieldinMIME多用途的网际邮件扩充协议Content-Typeis.

Atoconvertthemessagebodytoitsoriginnon-ASCIIform

Btodeterminewhatactionsitshouldtakeonmessagebody

CtosendanE-mailtothereceivinguseragent

Dtoindicatewhattypethemessageis

33.Inthefourfollowingoptions,whichapplicationisorganizedashybridofC/SandP2Ppeer-to-peerarchitecture

AE-mailBOICQCFiletransferDWebapplication

35.Inthefollowingoptions,fromtheapplicationdeveloper’sperspective,whichisnotcorrect

Athenetworkarchitectureisfixed

Bthenetworkarchitectureprovidesaspecificsetofservicestoapplications

Ctheapplicationarchitectureisdesignedbythephysicaldevices设备；

装置

Dtheapplicationarchitecturedictateshowtheapplicationisorganizedoverthevariousendsystems

36.Therearethreepredominant主要的，占主导地位的architecturesusedinmodernnetworkapplications,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.

39.Aprocesssendsmessagesinto,andreceivesmessagesfrom,thenetworkthroughits.

AsocketBprogramCclientDpeer

40.Whichoneisnotdefinedbyanapplication-layerprotocol

Athetypesofmessagesexchanged

Bthesyntaxofvariousmessagetypes

Cthesemanticsofthefields

Drulesfordeterminingwhenandhowtotranslatethesocket

41.HTTPcanusetwotypesofconnections,whichare.

Apersistentandnon-persistentconnection

Bconnectionwithpipelining流水线操作andwithoutpipelining

CTCPandUDP

Dparallelandserialconnection

42.takesforasmallpackettotravelfromclienttoserverandthenbacktotheclient.

ARDTBthresholdCRTTDoverhead

43.ThedefaultmodeofHTTP（和SMTP）uses.

Anon-persistentconnectionwithpipelining

Bnon-persistentconnectionwithoutpipelining

Cpersistentconnectionwithpipelining

Dpersistentconnectionwithoutpipelining

44.InHTTPrequestmessages,therequestlinehasthreefields,thereare.

Athemethodfield,theURL（UniformResourceLocator统一资源定位器）fieldandtheHTTPversionfield

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.isanetworkentitythatsatisfiesHTTPrequestsonthebehalfofanoriginWebserver.

AproxyserverBlocalserverCDNSserverDWebserver

48.Inthefollowingfouroptionsaboutwebcache,whichoneisnotcorrect

AAwebcacheisbothaserverandaclientatthesametime.

BAwebcacheispurchasedandinstalledbyanISP.

CAwebcachecanraisetheresponsetimeforaclientrequest.

DAwebcachecanreducetrafficonaninstitution’saccesslinktotheInternet.

49.TherequestmessageintheconditionalGETmustincludetheheaderline.

ALast-ModifiedBLast-Referenced

CIf-Modified-SinceDIf–Referenced-Since

50.FTPusestwoparallelconnectionstotransferafile,theyare.

ATCPandUDPconnection

Bconnectionwithpipeliningandwithoutpipelining

Ccontrolanddataconnection

Dclient-serverandbrowser-serverconnection

51.InFTPcommands,whichoneisusedtoasktheservertosendbackalistofallfilesinthecurrentremotedirectory

AUSERBPASSCLISTDRETR

52.IntheInternetmailsystem,allowuserstoread,replyto,forward,saveandcomposemessage.

AUseragentsBmailserversCSMTPDTCP

53.ThetwokeyMIMEheadersforsupportingmultimediaare.

AContent-TypeandMIME-Version

BContent-TypeandContent-Transfer-Encoding

CContent-Transfer-EncodingandMIME-Version