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Imagine that you are the primary network engineer for an enterprise TCP/IP internetwork.
Your company is building a new building at a site 100 miles away from your corporate headquarters.
You will of course install a LAN throughout the new building, but you also need to
connect that new remote LAN to the rest of the existing enterprise TCP/IP network.
To connect the new building’s LAN to the rest of the existing corporate network, you need
some kind of a WAN. At a minimum, that WAN must be able to send data from the remote
LAN back to the rest of the existing network and vice versa. Leased line WANs do exactly
that, forwarding data between two routers.
From a basic point of view, a leased line WAN works a lot like an Ethernet crossover cable
connecting two routers, but with few distance limitations. Each router can send at any time
(full duplex) over the leased line, for tens, hundreds, or even thousands of miles.
This section begins by giving some perspective about where leased lines fit with LANs and
routers, because one main goal for a WAN is to move data between LANs. The rest of this
first section explains the physical details about leased lines, followed with information
about data-link protocols .