The Need to Route

The concept of logical adjacency works just as well between two machines connected to the same LAN as it does between internetworked machines that are thousands of miles apart. Obviously, there are some significant differences between these two extreme examples, but the concept of logical adjacency holds true. The biggest difference lies in establishing the connection between the source and destination machines. On a LAN, the two machines can communicate just by putting their framed data on the transmission media. In an internetwork, the two machines are separated by an unknown quantity of networking hardware and transmission facilities. Flooding the transmission facilities in the hopes of eventually delivering the packets ...

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