计算机网络英文题库附答案chapter2Word格式.docx

计算机网络英文题库附答案chapter2Word格式.docx

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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 

. 

Centralized 

Directory 

（Napster） 

Query 

Flooding（Gnutella）

Exploiting 

Heterogeneity 

（p141） 

Incentive 

Priorities 

26. 

Napster 

.

（p137） 

{

Flooding 

Priorities

27. 

The 

following 

is 

an 

overlay 

network 

Flooding（p139） 

*

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. 

four 

options, 

a 

centralized 

DNS 

design’s 

problem 

single 

point 

failure 

traffic 

volume 

distant 

database 

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. 

often 

used 

to 

create 

powerful 

virtual 

server 

C/S 

architecture. 

Peers 

Server 

farm 

stack 

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.isanetworkentitythatsatisfiesHTTPrequestsonth