e. LANs span large geographic areas if a LAN administrator con?¬?gures them
correctly.
4. At which OSI layer do WAN protocols describe how to provide electrical, mechanical,
operational, and functional connections to the services of a communications service
provider?
a. Layer 1
b. Layer 2
c. Layer 3
d. Layer 4
5. At which OSI layer do WAN protocols de?¬?ne encapsulation of data for transmission
toward a remote location and the mechanisms for transferring the resulting frames?
a. Layer 1
b. Layer 2
c. Layer 3
d. Layer 4
6. Match each type of WAN device to its function.
___In analog lines, they convert the digital signal of the sending device into analog
format for transmission over an analog line and then convert the signal back to
digital form so that the receiving device can receive and process the network
signal.
___They concentrate dial-in and dial-out user communications.
Review Questions 411
___They provide internetworking and WAN access interface ports.
___WANs use these to provide access.
a. Routers
b. Communication servers
c. Modems
d. Other networking devices
7. Match each type of connection on a router to its function.
___allow the router to connect to the LAN media through Ethernet or some other
LAN technology such as Token Ring or ATM.
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