思科网络学院CCNA4练习题和答案EnglishFormDEWANv.docx
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思科网络学院CCNA4练习题和答案EnglishFormDEWANv.docx
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思科网络学院CCNA4练习题和答案EnglishFormDEWANv
思科网络学院CCNA4练习题和答案EnglishFormDEWANv4.0Chapter1
.2.4WANSwitchingConcepts
AssessmentItem:
Whatisanadvantageofpacket-switchedtechnologyovercircuit-switchedtechnology?
Packet-switchednetworksarelesssusceptibletojitterthancircuit-switchednetworksare.
Packet-switchednetworkscanefficientlyusemultipleroutesinsideaserviceprovidernetwork.
Packet-switchednetworksdonotrequireanexpensivepermanentconnectiontoeachendpoint.
Packet-switchednetworksusuallyexperiencelowerlatencythancircuit-switchednetworksexperience.
ResetViewLearnerResponse
ScoringRulefor:
correctnessofresponse
2pointsforOption2
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration
1.2.3WANDataLinkLayerConcepts
AssessmentItem:
WhichstatementaboutWANprotocolsiscorrect?
ATMdiffersfromotherWANprotocolsinthatitusesvariablysizedpackets.
MostWANprotocolsuseHDLCoravariantofHDLCasaframingmechanism.
Theframeheaderconsistsoftheframechecksequenceandcyclicredundancycheck.
ISDNdiffersfromFrameRelay,HDLC,andATMinthatitispacket-switchedratherthancircuit-switchedtechnology.
Reset
ScoringRulefor:
correctnessofresponse
2pointsforOption2
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration
1.2.4WANSwitchingConcepts
AssessmentItem:
Whyisthecallsetuptimeofacircuit-switchedWANimplementationconsideredadrawback?
Routingprotocolsareincompatiblewiththisfunction.
Itrestrictsthecommunicationsenttovoicetrafficonly.
Atelephonemustbeusedtoinitiallystarttransferringdata.
Datacannotbetransferreduntilacircuithasbeenestablished.
Reset
ScoringRulefor:
correctnessofresponse
2pointsforOption4
AssessmentItem:
WhichstatementistrueaboutthedifferencesbetweenaWANandaLAN?
WANsgenerallysupporthigherbandwidththanLANssupport.
AWANlinktypicallytraversesshortergeographicdistancesthanaLANlinktraverses.
AWANoftenreliesontheservicesofcarriers,suchastelephoneorcablecompanies,butaLANdoesnot.
AllWANimplementationsgenerallyusethesameLayer2protocolbuttherearemanyacceptedLANLayer2protocolsinuse.
Reset
ScoringRulefor:
correctnessofresponse
2pointsforOption3
1.2.2WANPhysicalLayerConcepts
AssessmentItem:
Whichstatementistrueaboutdataconnectivitybetweenacustomerandaserviceprovider?
NormallytheCSU/DSUisthedesignateddemarcationpointfortheserviceproviderbutnotthecustomer.
Thesegmentbetweenthedemarcationpointandthecentralofficeisknownasthe"lastmile."
ThelocalloopisthesegmentbetweentheCSU/DSUandtheserialportonarouter.
PuttingdataonthelocalloopistheresponsibilityoftheDTE.
Reset
ScoringRulefor:
correctnessofresponse
2pointsforOption2
1.1.3TheEvolvingNetworkModel
AssessmentItem:
Whichstatementistrueofthefunctionalityofthelayersinthehierarchicalnetworkmodel?
Thepurposeoftheaccesslayeristoprovideveryhighbandwidthcommunicationsbetweennetworkdevices.
Mostsecurityscreeningtopreventunauthorizedentrytothenetworkhappensatthecorelayer.
Untrustedexternalconnectionsaresegmentedfromtherestofthenetworkatallthreelevels.
ThedistributionlayeraggregatesWANconnectionsattheedgeofthecampus.
Reset
ScoringRulefor:
correctnessofresponse
2pointsforOption4
1.2.2WANPhysicalLayerConcepts
AssessmentItem:
Whichtwodevicesarecommonlyusedasdatacommunicationsequipment?
(Choosetwo.)
modem
router
CSU/DSU
ISDNswitch
Ethernetswitch
Reset
ScoringRulefor:
correctnessofresponse
Option1andOption3arecorrect.
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration
1.3.4PacketSwtichedConnectionOptions
AssessmentItem:
AcompanyneedsaWANconnectionthatiscapableoftransferringvoice,video,anddataataminimumdatarateof155Mbps.WhichWANconnectionisthebestchoice?
X.25
DSL
ATM
ISDNBRI
ISDNPRI
Reset
ScoringRulefor:
correctnessofresponse
2pointsforOption3
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration
1.2.4WANSwitchingConcepts
AssessmentItem:
Whichswitchingtypewillallowthecommunicationdevicesintheprovidernetworktobesharedandonlyallocatedtoanindividualsubscriberduringdatatransfer?
circuit-switched
dedicatedswitchedlines
frame-switched
packet-switched
ResetViewLearnerResponse
ScoringRulefor:
correctnessofresponse
2pointsforOption4
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration
1.2.2WANPhysicalLayerConcepts
AssessmentItem:
Whichtermdescribesadevicethatwillputdataonthelocalloop?
DLCI
DTE
DCE
BRI
PRI
Reset
ScoringRulef
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