WAN Technologies
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
ISDN
T-carrier lines
Fiber Distributed Data Interface (FDDI)
ATM
X.25
Frame Relay
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.
Dial-up Modem Connections
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 ...
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