WAN Implementation
The wide area network (WAN) consists of a combination of leased lines and switched lines. The transport speeds vary between DS0 and DS3. The protocols being used are High-Level Data Link Control (HDLC), Frame Relay, and Ansynchronous Transfer Mode (ATM). Normally, a network would not have such a wide variety of protocols for the simple reason of consistency, not to mention the fact that the less hardware you need to maintain spares for, the better. The reason they are all present in this design is because portions of the network used to exist as separate companies. The current network shown in this chapter is the result of various mergers and acquisitions.
Table 13.2 lists pointers to the specific chapters that cover the ...
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