计算机网络英文试题库附答案chapterWord格式.docx
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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.isanetworkentitythatsatisfiesHTTPrequestsonthebehalfofanoriginWebserver.
Aproxyse