1. At which two layers of the OSI model does a WAN operate? (Choose two.)
**Physical Layer
**Data Link Layer
Network Layer
Transport Layer
Presentation Layer
Application Layer
2. Which three WAN devices can be found in the cloud? (Choose three.)
** ATM switches
**core routers
CSU/DSU
Ethernet switches
**Frame Relay switches
repeaters
3. Which networking device is typically used to concentrate the dialin and dialout
traffic of multiple users to and from a network?
core router
** access server
Frame Relay switch
ATM switch
4. Which packetswitched WAN technology offers highbandwidth connectivity capable
of managing data, voice, and video all on the same infrastructure?
Time Division Multiplexing (TDM)
**metro Ethernet
Integrated Services Digital Network (ISDN)
Public Switched Telephone Network (PSTN)
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