A simple solution from the LAN manager??™s
perspective may be to connect the LANs using an Ethernet port as though they
were not in separate locations.
?– Enterprise to Internet service provider connection A typical enterprise
LAN network is comprised of nodes interconnected by Ethernet ports. Other technologies
such as Fiber Distributed Data Interface (FDDI) and token ring are also
in use, but Ethernet is by far the most widely deployed. Regardless of the LAN
protocol in operation, the enterprise??™s connection to its ISP is typically of another
variety. Because the ISP??™s router is located at a remote location, the ISP connection
must use the existing TDM network to make the connection. Therefore, both the
enterprise router and the ISP??™s router must use a more expensive TDM port. If it
were possible to transmit Ethernet directly to the ISP??™s router, both of the routers
could use a more economical Ethernet port, and the network managers would not
have to deal with TDM ports.
?– ISP router interconnection The any-to-any connectivity of the Internet is
created by a vast network of interconnected routers. An ISP??™s routers are interconnected,
and the ISP??™s network is interconnected, or peered, with other ISPs
and service provider networks.
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