思科网络学院CCNA4练习题和答案EnglishFormDEWANv4.docx
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思科网络学院CCNA4练习题和答案EnglishFormDEWANv4
思科网络学院CCNA4练习题和答案EnglishFormDEWANChapter1
.WANSwitchingConcepts
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?
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
ScoringRulefor:
correctnessofresponse
2pointsforOption3
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration
1.2.2WANPhysicalLayerConcepts
AssessmentItem:
Fordigitallines,whichdeviceisusedtoestablishthecommunicationslinkbetweenthecustomerequipmentandthelocalloop?
CSU/DSU
FrameRelayswitch
ISDNswitch
modem
PBXswitch
Reset
ScoringRulefor:
correctnessofresponse
2pointsforOption1
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration
1.3.3CircuitSwitchedConnectionOptions
AssessmentItem:
AU.S.companyrequiresaWANconnectionusedonlytotransfersalesdatafromindividualstorestothehomeoffice.Alltransferswilloccurafterbusinesshours.Therequiredbandwidthforthisconnectionisestimatedtobelessthan38kbps.Whichtypeofconnectionrequirestheleastinvestmentforthiscompany?
ATM
ISDN
analogdialup
T1LeasedLine
Reset
ScoringRulefor:
correctnessofresponse
2pointsforOption3
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration
1.3.5InternetConnectionOptions
AssessmentItem:
WhattypeofconnectivityisestablishedwhenVPNsareusedfromtheremotesitetotheprivatenetwork?
PVCs
DLCIs
tunnels
virtualcircuits
dedicatedLayer2links
ResetViewLearnerResponse
ScoringRulefor:
correctnessofresponse
2pointsforOption3
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration
1.3.5InternetConnectionOptions
AssessmentItem:
Whatcancauseareductioninavailablebandwidthonacablebroadbandconnection?
smallercells
numberofsubscribers
committedinformationrate
distancefromthecentralofficeoftheprovider
Reset
ScoringRulefor:
correctnessofresponse
2pointsforOption2
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration
1.3.3CircuitSwitchedConnectionOptions
AssessmentItem:
WhatthreetermsareassociatedwithISDNPRI?
(Choosethree.)
DLCI
circuitswitching
packetswitching
databearerchannels
switchedvirtualcircuits
time-divisionmultiplexing
Reset
ScoringRulefor:
correctnessofresponse
Option2,Option4,andOption6arecorrect.
1pointforeachcorrectoption
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration
1.3.3CircuitSwitchedConnectionOptions
AssessmentItem:
WhataretwoadvantagesofananalogPSTNWANconnection?
(Choosetwo.)
lowcost
availability
trafficencryption
availablebandwidth
supportforvoiceandvideo
Reset
ScoringRulefor:
correctnessofresponse
Option1andOption2arecorrect
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration
1.3.4PacketSwtichedConnectionOptions
AssessmentItem:
WhichWANtechnologyusesafixedpayloadof48bytesandistransportedacrossbothswitchedandpermanentvirtualcircuits?
ATM
ISDN
FrameRelay
metroEthernet
ResetViewLearnerResponse
ScoringRulefor:
correctnessofresponse
2pointsforOption1
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration
1.3.4PacketSwtichedConnectionOptions
AssessmentItem:
WhichthreefeaturesareidentifiedwithFrameRelayconnections?
(Choosethree.)
CIR
DLCI
DSLAM
PVC
SPID
53-bytecells
Reset
ScoringRulefor:
correctnessofresponse
Option1,Option2,andOption4arecorrect
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration
1.3.5InternetConnectionOptions
AssessmentItem:
Whichpacket-switchedWANtechnologyoffershigh-bandwidthconnectivitycapableofmanagingdata,voice,andvideoallonthesameinfrastructure?
TimeDivisionMultiplexing(TDM)
metroEthernet
IntegratedServicesDigitalNetwork(ISDN)
PublicSwitchedTelephoneNetwork(PSTN)
ResetViewLearnerResponse
ScoringRulefor:
correctnessofresponse
2pointsforOption2
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration
1.2.2WANPhysicalLayerConcepts
AssessmentItem:
Whichnetworkingdeviceistypicallyusedtoconcentratethedial-inanddial-outtrafficofmultipleuserstoandfromanetwork?
corerouter
accessserver
FrameRelayswitch
ATMswitch
Reset
ScoringRulefor:
correctnessofresponse
2pointsforOption2
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration
1.2.1WANTechnologyOverview
AssessmentItem:
WhichthreeWANdevicescanbefoundinthecloud?
(Choosethree.)
ATMswitches
corerouters
CSU/DSU
Ethernetswitches
FrameRelayswitches
repeaters
Reset
ScoringRulefor:
correctnessofresponse
Option1,Option2,andOption5arecorrect.
1pointforeachcorrectoption.
Thisitemreferencescontentfromthefollowingareas:
CCNAExploration
1.2.1WANTechnologyOverview
AssessmentItem:
AtwhichtwolayersoftheOSImodeldoesaWANoperate?
(Choosetwo.)
PhysicalLayer
DataLinkLayer