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 ...