CCNA路由协议和概念第7单元.docx
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CCNA路由协议和概念第7单元
1
窗体顶端
WhichthreefactorsshouldbeconsideredwhenimplementingaLayer2protocolinanetwork?
（Choosethree.）
theLayer3protocolselected
thegeographicscopeofthenetwork
thePDUdefinedbythetransportlayer
thephysicallayerimplementation
thenumberofhoststobeinterconnected
窗体底端
Observable
Description
MaxValue
1
correctnessofresponse
Option2,Option4,andOption5arecorrect.
1pointforeachcorrectoption.
0pointsifmoreoptionsareselectedthanrequired.
3
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration:
NetworkFundamentals
∙7.3.5DataLinkLayerProtocols-TheFrame
2
窗体顶端
Refertotheexhibit.AssumingthatthenetworkintheexhibitisconvergedmeaningtheroutingtablesandARPtablesarecomplete,whichMACaddresswillHostAplaceinthedestinationaddressfieldofEthernetframesdestinedforwww.server?
00-1c-41-ab-c0-00
00-0c-85-cf-65-c0
00-0c-85-cf-65-c1
00-12-3f-32-05-af
窗体底端
Observable
Description
MaxValue
1
correctnessofresponse
2pointsforOption2
0pointsforanyotheroption
2
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration:
NetworkFundamentals
∙7.4.1FollowDataThroughanInternetwork
3
窗体顶端
Whichoptionsarepropertiesofcontention-basedmediaaccessforasharedmedia?
（Choosethree.）
non-deterministic
lessoverhead
onestationtransmitsatatime
collisionsexist
devicesmustwaittheirturn
tokenpassing
窗体底端
Observable
Description
MaxValue
1
correctnessofresponse
Option1,Option2,andOption4arecorrect.
1pointforeachcorrectoption.
0pointsifmoreoptionsareselectedthanrequired.
3
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration:
NetworkFundamentals
∙7.2.2MediaAccessControlforSharedMedia
4
窗体顶端
Whatistrueconcerningphysicalandlogicaltopologies?
Thelogicaltopologyisalwaysthesameasthephysicaltopology.
Physicaltopologiesareconcernedwithhowanetworktransfersframes.
PhysicalsignalpathsaredefinedbyDataLinklayerprotocols.
Logicaltopologiesconsistofvirtualconnectionsbetweennodes.
窗体底端
Observable
Description
MaxValue
1
correctnessofresponse
2pointsforOption4
0pointsforanyotheroption
2
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration:
NetworkFundamentals
∙7.2.4LogicalTopologyvsPhysicalTopology
5
窗体顶端
Whatdeterminesthemethodofmediaaccesscontrol?
（Choosetwo.）
networklayeraddressing
mediasharing
applicationprocesses
logicaltopology
intermediarydevicefunction
窗体底端
Observable
Description
MaxValue
1
correctnessofresponse
Option2andOption4arecorrect.
1pointforeachcorrectoption.
0pointsifmoreoptionsareselectedthanrequired.
2
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration:
NetworkFundamentals
∙7.2.1PlacingDataontheMedia
6
窗体顶端
Whatistrueregardingmediaaccesscontrol?
（Choosethree.）
EthernetutilizesCSMA/CD
definedasplacementofdataframesonthemedia
contention-basedaccessisalsoknownasdeterministic
802.11utilizesCSMA/CD
DataLinklayerprotocolsdefinetherulesforaccesstodifferentmedia
controlledaccesscontainsdatacollisions
窗体底端
Observable
Description
MaxValue
1
correctnessofresponse
Option1,Option2,andOption5arecorrect.
1pointforeachcorrectoption.
0pointsifmoreoptionsareselectedthanrequired.
3
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration:
NetworkFundamentals
∙7.2.1PlacingDataontheMedia
7
窗体顶端
Whichstatementsdescribethelogicaltoken-passingtopology?
（Choosetwo.）
Networkusageisonafirstcome,firstservebasis.
Computersareallowedtotransmitdataonlywhentheypossessatoken.
Datafromahostisreceivedbyallotherhosts.
Electronictokensarepassedsequentiallytoeachother.
Tokenpassingnetworkshaveproblemswithhighcollisionrates.
窗体底端
Observable
Description
MaxValue
1
correctnessofresponse
Option2andOption4arecorrect.
1pointforeachcorrectoption.
0pointsifmoreoptionsareselectedthanrequired.
2
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration:
NetworkFundamentals
∙7.2.6Multi-AccessTopology
8
窗体顶端
Anetworkadministratorhasbeenaskedtoprovideagraphicrepresentationofexactlywherethecompanynetworkwiringandequipmentarelocatedinthebuilding.Whatisthistypeofdrawing?
logicaltopology
physicaltopology
cablepath
wiringgrid
accesstopology
窗体底端
Observable
Description
MaxValue
1
correctnessofresponse
2pointsforOption2
0pointsforanyotheroption
2
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration:
NetworkFundamentals
∙7.2.4LogicalTopologyvsPhysicalTopology
9
窗体顶端
WhatisthepurposeofthepreambleinanEthernetframe?
isusedasapaddingfordata
isusedfortimingsynchronization
isusedtoidentifythesourceaddress
isusedtoidentifythedestinationaddress
窗体底端
Observable
Description
MaxValue
1
correctnessofresponse
2pointsforOption2
0pointsforanyotheroption
2
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration:
NetworkFundamentals
∙7.3.5DataLinkLayerProtocols-TheFrame
10
窗体顶端
WhatstatementsaretrueregardingaddressesfoundateachlayeroftheOSImodel?
（Choosetwo.）
Layer2mayidentifydevicesbyaphysicaladdressburnedintothenetworkcard
Layer2identifiestheapplicationsthatarecommunicating
Layer3representsahierarchicaladdressingscheme
Layer4directscommunicationtotheproperdestinationnetwork
Layer4addressesareusedbyintermediarydevicestoforwarddata
窗体底端
Observable
Description
MaxValue
1
correctnessofresponse
Option1andOption3arecorrect.
1pointforeachcorrectoption.
0pointsifmoreoptionsareselectedthanrequired.
2
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration:
NetworkFundamentals
∙7.4.1FollowDataThroughanInternetwork
11
窗体顶端
Refertotheexhibit.Whichstatementdescribesthemediaaccesscontrolmethodsthatareusedbythenetworksintheexhibit?
AllthreenetworksuseCSMA/CA
Noneofthenetworksrequiremediaaccesscontrol.
Network1usesCSMA/CDandNetwork3usesCSMA/CA.
Network1usesCSMA/CAandNetwork2usesCSMA/CD.
Network2usesCSMA/CAandNetwork3usesCSMA/CD.
窗体底端
Observable
Description
MaxValue
1
correctnessofresponse
2pointsforOption3
0pointsforanyotheroption
2
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration:
NetworkFundamentals
∙7.2.2MediaAccessControlforSharedMedia
12
窗体顶端
Refertotheexhibit.HowmanyCRCcalculationswilltakeplaceastrafficroutesfromthePCtothelaptop?
1
2
4
6
8
16
窗体底端
Observable
Description
MaxValue
1
correctnessofresponse
2pointsforOption5
0pointsforanyotheroption
2
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration:
NetworkFundamentals
∙7.3.4Framing-RoleoftheTrailer
13
窗体顶端
Refertotheexhibit.AframeisbeingsentfromthePCtothelaptop.WhichsourceMACandIPaddresseswillbeincludedintheframeasitleavesRouterB?
（Choosetwo.）
sourceMAC-PC
sourceMAC-S0/0onRouterA
sourceMAC-Fa0/1onRouterB
sourceIP-PC
sourceIP-S0/0onRouterA
sourceIP-Fa0/1ofRouterB
窗体底端
Observable
Description
MaxValue
1
correctnessofresponse
Option3andOption4arecorrect.
1pointforeachcorrectoption.
0pointsifmoreoptionsareselectedthanrequired.
2
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration:
NetworkFundamentals
∙7.4.1FollowDataThroughanInternetwork
14
窗体顶端
Whichsublayerofthedatalinklayerpreparesasignaltobetransmittedatthephysicallayer?
LLC
MAC
HDLC
NIC
窗体底端
Observable
Description
MaxValue
1
correctnessofresponse
2pointsforOption2
0pointsforanyotheroption
2
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration:
NetworkFundamentals
∙7.1.4DataLinkLayer-ConnectingUpperLayerServicestotheMedia
15
窗体顶端
Whattwofactsaretruewhenadeviceismovedfromonenetworkorsubnettoanother?
（Choosetwo.）
TheLayer2addressmustbereassigned.
Thedefaultgatewayaddressshouldnotbechanged.
ThedevicewillstilloperateatthesameLayer2address.
Applicationsandserviceswillneedadditionalportnumbersassigned.
TheLayer3addressmustbereassignedtoallowcommunicationstothenewnetwork.
窗体底端
Observable
Description
MaxValue
1
correctnessofresponse
Option3andOption5arecorrect.
1pointforeachcorrectoption.
0pointsifmoreoptionsareselectedthanrequired.
2
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration:
NetworkFundamentals
∙7.3.3Addressing-WheretheFrameGoes
16
窗体顶端
Whatisafunctionofthedatalinklayer?
providestheformattingofdata
providesend-t
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