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http://ccna-4.blogspot.comhttp://360.yahoo.com/quocvuong_it12Which WAN technology allows telecommunication companies to offer enterprises services such as storanetworking, secure Layer 2 and Layer 3 VPNs, and disaster recovery on public networks?DSLATMISDNmetro EthernetWhat three technologies are associated with ISDN PRI? (Choose three.)DLCIcircuit switchingpacket switchingdata bearer channelsswitched virtual circuits345time division multiplexingWhat can cause a reduction in available bandwidth on a cable broadband connection?smaller cellsnumber of subscriberscommitted information ratedistance from the central office of the providerAt which two layers of the OSI model does a WAN operate? (Choose two.)Physical LayerData Link LayerNetwork LayerTransport LayerPresentation LayerApplication LayerWhich device is used to establish the communications link between the customer equipment and thelocal loop for digital lines?terminal adaptermodemCSU/DSUPBX switchISDN switchFrame Relay Switch6Which WAN technology uses a fixed payload of 48 bytes and is transported across both switched andpermanent virtual circuits?ATMISDNhttp://ccna-4.blogspot.comhttp://360.yahoo.com/quocvuong_itFrame Relaymetro Ethernet7Which two devices are commonly used as data communications equipment? (Choose two.)modemrouterCSU/DSUISDN switchEthernet switch8Which switching type will allow the communication devices in the provider's network to be shared and oallocated to an individual subscriber during data transfer?circuit-switchedpacket-switchedframe-switcheddedicated-switched lineslease-switched9Virtual private networks (VPNs) use what type of connection from the remote site to the private networkPVCsDLCIstunnelsvirtual circuitsdedicated Layer 2 links10Refer to the exhibit.

The users in the branch office initiated three simultaneous calls to the HQ office. Wtechnology is used to ensure that a fixed-capacity connection is made available to each of the calls?time-division multiplexing (TDM)signalingX.25http://ccna-4.blogspot.comhttp://360.yahoo.com/quocvuong_itISDN BRI11A U.S. company requires a WAN connection used only to transfer sales data from individual stores to thome office. All transfers will occur after business hours.

The required bandwidth for this connection isestimated to be less than 38 kbps. Which type of connection requires the least investment for this compATMISDNanalog dialupT1 Leased Line12Which three WAN devices can be found in the cloud? (Choose three.)Ethernet switchesFrame Relay switchesATM switchesbridgescore routersrepeaters13Which term describes a device that will put data on the local loop?DLCICODCEDTEPRIBRI14 Which packet-switched WAN technology offers high-bandwidth connectivity capable of managing data,and video all on the same infrastructure?Time Division Multiplexing (TDM)metro EthernetIntegrated Services Digital Network (ISDN)Public Switched Telephone Network (PSTN)15What are two advantages of an analog PSTN WAN connection? (Choose two.)low costavailabilitytraffic encryptionavailable bandwidthsupport for voice and video16Which three features are identified with Frame Relay connections? (Choose three.)http://ccna-4.blogspot.comhttp://360.yahoo.com/quocvuong_itCIRDLCIDSLAMPVCSPID53-byte cells17Which networking device is typically used to concentrate the dial-in and dial-out traffic of multiple useand from a network?core routeraccess serverFrame Relay switchATM switch18What are three advantages of permanent dedicated circuits over shared lines such as Frame-Relay? (Chthree.)dedicated bandwidth capacityeliminates latency and jitter between endpointslow cost of implementationconnections can be multiplexed over the same leased lineeach endpoint has a dedicated physical router interfaceeliminates point-to-point connections19 A company needs a WAN connection that is capable of transferring voice, video, and data at a minimumrate of 155 Mbps.

Which WAN connection is the best choice?X.25DSLATMISDN BRIISDN PRI.

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