Chapter 13. Expanding a LAN with WAN Technology

In this chapter

  • Defining the wide area network

  • WAN technology and the Plain Old Telephone System

  • Working with asynchronous and synchronous modems

  • Understanding the T-carrier system

  • Differentiating between circuit- and packet-switching WAN technologies

Our exploration of networking has, so far, centered primarily on the local area network (LAN). LANs, however—even the largest—are isolated; they can only connect computers and other devices in a fairly small geographical area. Large companies and institutions that span multiple sites need to be able to connect all their LANs into one large network. Wide area networks (WANs) are networks made up of a number of LANs. So, a wide area network can be defined as ...

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