CCNAENetworkChapter2Word格式.docx
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CCNAENetworkChapter2Word格式.docx
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分类:
CCNA.CISCO.ANSWERS
Postedby
SpaceonSunday,
May10,2009
1Whatarethekeyfunctionsofencapsulation?
(Choosethree.)
*allowsmodificationoftheoriginaldatabeforetransmission
*identifiespiecesofdataaspartofthesamecommunication
*enablesconsistentnetworkpathsforcommunication
ensuresthatdatapiecescanbedirectedtothecorrectreceivingenddevice
enablesthereassemblyofcompletemessages
tracksdelaybetweenenddevices
2Whichlayerencapsulatesthesegmentintopackets?
physical
datalink
*network
transport
3WhichthreestatementsbestdescribeaLocalAreaNetwork(LAN)?
*ALANisusuallyinasinglegeographicalarea.
*Thenetworkisadministeredbyasingleorganization.
TheconnectionbetweensegmentsintheLANisusuallythroughaleasedconnection.
Thesecurityandaccesscontrolofthenetworkarecontrolledbyaserviceprovider.
*ALANprovidesnetworkservicesandaccesstoapplicationsforuserswithinacommonorganization.
EachendofthenetworkisgenerallyconnectedtoaTelecommunicationServiceProvider(TSP).
4WhatistheproperorderofthelayersoftheOSImodelfromthehighestlayertothelowestlayer?
physical,network,application,datalink,presentation,session,transport
application,physical,session,transport,network,datalink,presentation
application,presentation,physical,session,datalink,transport,network
*application,presentation,session,transport,network,datalink,physical
presentation,datalink,session,transport,network,physical,application
5Duringtheencapsulationprocess,whatoccursatthedatalinklayer?
Noaddressisadded.
Thelogicaladdressisadded.
*Thephysicaladdressisadded.
Theprocessportnumberisadded.
6Selectthestatementsthatarecorrectconcerningnetworkprotocols.(Choosethree.)
definethestructureoflayerspecificPDU'
s
*dictatehowtoaccomplishlayerfunctions
*outlinethefunctionsnecessaryforcommunicationsbetweenlayers
limithardwarecompatibility
*requirelayerdependentencapsulations
eliminatestandardizationamongvendors
7
Refertotheexhibit.Whichthreelabelscorrectlyidentifythenetworktypesforthenetworksegmentsthatareshown?
NetworkA--WAN
*NetworkB--WAN
*NetworkC--LAN
NetworkB--MAN
NetworkC--WAN
*NetworkA--LAN
8Whichstatementscorrectlyidentifytheroleofintermediarydevicesinthenetwork?
*determinepathwaysfordata
initiatedatacommunications
*retimeandretransmitdatasignals
originatetheflowofdata
*managedataflows
finalterminationpointfordataflow
9WhichtwolayersoftheOSImodelhavethesamefunctionsastheTCP/IPmodelNetworkAccessLayer?
(Choosetwo.)
*Network
Transport
*Physical
DataLink
Session
10Whatcanbeidentifiedbyexaminingthenetworklayerheader?
thedestinationdeviceonthelocalmedia
*thepathtousetoreachthedestinationhost
thebitsthatwillbetransferredoverthemedia
thesourceapplicationorprocesscreatingthedata
11
Refertotheexhibit."
CellA"
atIPaddress10.0.0.34hasestablishedanIPsessionwith"
IPPhone1"
atIPaddress172.16.1.103.Baseduponthegraphic,whichdevicetypebestdescribesthefunctionofwirelessdevice"
CellA?
"
thedestinationdevice
*anenddevice
anintermediatedevice
amediadevice
12
Refertotheexhibit.Whichsetofdevicescontainsonlyenddevices?
*A,C,D
B,E,G,H
C,D,G,H,I,J
D,E,F,H,I,J
E,F,H,I,J
13WhatisthepurposeoftheTCP/IPNetworkAccesslayer?
*pathdeterminationandpacketswitching
datarepresentation,encoding,andcontrol
reliability,flowcontrol,anderrordetection
detailingthecomponentsthatmakeupthephysicallinkandhowtoaccessit
thedivisionofsegmentsintopackets
14Whatdeviceisconsideredanintermediarydevice?
fileserver
IPphone
laptop
printer
*switch
15WhatisaPDU?
corruptionofaframeduringtransmission
datareassembledatthedestination
retransmittedpacketsduetolostcommunication
*alayerspecificencapsulation
16WhatistheprimarypurposeofLayer4portassignment?
toidentifydevicesonthelocalmedia
toidentifythehopsbetweensourceanddestination
toidentifytotheintermediarydevicesthebestpaththroughthenetwork
toidentifythesourceanddestinationenddevicesthatarecommunicating
*toidentifytheprocessesorservicesthatarecommunicatingwithintheenddevices
17Whatisaprimaryfunctionofthetrailerinformationaddedbythedatalinklayerencapsulation?
*supportserrordetection
ensuresorderedarrivalofdata
providesdeliverytocorrectdestination
identifiesthedevicesonthelocalnetwork
assistsintermediarydeviceswithprocessingandpathselection
18
Refertotheexhibit.Whichtermcorrectlyidentifiesthedevicetypethatisincludedinthegreenarea?
source
end
transfer
*intermediary
19
Refertotheexhibit.Whichnetworkingtermdescribesthedatainterleavingprocessrepresentedinthegraphic?
piping
PDU
streaming
*multiplexing
encapsulation
20Whichcharacteristiccorrectlyreferstoenddevicesinanetwork?
managedataflows
originatedataflow
retimeandretransmitdatasignals
determinepathwaysfordata
21
Refertotheexhibit.Whattypeofnetworkisshown?
WAN
MAN
*LAN
WLAN
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