CCNA Exploration 4 Accessing the WAN Chapter 1

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1、CCNAExploration4AccessingtheWANChapter11Whichstatementistrueofthefunctionalityofthelayersinthehierarchicalnetworkmodel?5Thepurposeoftheaccesslayeristoprovideveryhighbandwidthcommunicationsbetweennetworkdevices.Mostsecurityscreeningtopreventunauthorizedentrytothenetworkhappensatthec

2、orelayer.Untrustedexternalconnectionsaresegmentedfromtherestofthenetworkatallthreelevels.Thecorelayeruseshighspeedequipmenttoprovidepolicy-basedconnectivity.ThedistributionlayeraggregatesWANconnectionsattheedgeofthecampus.2WhatthreetermsareassociatedwithISDNPRI?(Choosethree.)246DLC

3、Icircuitswitchingpacketswitchingdatabearerchannelsswitchedvirtualcircuitstime-divisionmultiplexing3AtwhichtwolayersoftheOSImodeldoesaWANoperate?(Choosetwo.)12PhysicalLayerDataLinkLayerNetworkLayerTransportLayerPresentationLayerApplicationLayer4Whichpacket-switchedWANtechnologyoffer

4、shigh-bandwidthconnectivitycapableofmanagingdata,voice,andvideoallonthesameinfrastructure?2TimeDivisionMultiplexing(TDM)metroEthernetIntegratedServicesDigitalNetwork(ISDN)PublicSwitchedTelephoneNetwork(PSTN)5Whyisthecallsetuptimeofacircuit-switchedWANimplementationconsideredadrawba

5、ck?4Routingprotocolsareincompatiblewiththisfunction.Itrestrictsthecommunicationsenttovoicetrafficonly.Atelephonemustbeusedtoinitiallystarttransferringdata.Datacannotbetransferreduntilacircuithasbeenestablished.6WhichstatementistrueaboutthedifferencesbetweenaWANandaLAN?3WANsgenerall

6、ysupporthigherbandwidththanLANssupport.AWANlinktypicallytraversesshortergeographicdistancesthanaLANlinktraverses.AWANoftenreliesontheservicesofcarriers,suchastelephoneorcablecompanies,butaLANdoesnot.AllWANimplementationsgenerallyusethesameLayer2protocolbuttherearemanyacceptedLANLay

7、er2protocolsinuse.7WhichthreefeaturesareidentifiedwithFrameRelayconnections?(Choosethree.)124CIRDLCIDSLAMPVCSPID53-bytecells8WhattypeofconnectivityisestablishedwhenVPNsareusedfromtheremotesitetotheprivatenetwork?3PVCsDLCIstunnelsvirtualcircuitsdedicatedLayer2links9Fordigitallines,w

8、hichdeviceisusedtoestablis