Having looked at the differences between the various switching methods, we can now take a better look at the technologies used to create WANs. Several technologies, including the following, can be used to implement WANs:
Dial-up modem connections
Fiber Distributed Data Interface (FDDI)
Synchronous Optical Network (SONET)/OC-x
These technologies vary in terms of cost, complexity, and switching methods. We'll start our discussion by looking at perhaps the simplest of WAN technologies—the modem.
Today, people are more likely to associate a modem with a dial-up Internet service provider (ISP) account than with a WAN technology. But the reality is that for many years, and ...