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==General protocol suite
T ~ ~ ~ T
[A] [B]_____[C]
Imagine three computers: ''A'', ''B'', and ''C''. ''A'' and ''B'' both have radio equipment and can communicate via the airwaves using a suitable network protocol (such as [[IEEE 802.11]]). ''B'' and ''C'' are connected via a cable, using it to exchange data (again, with the help of a protocol, for example [[Point-to-Point Protocol]]). However, neither of these two protocols will be able to transport information from ''A'' to ''C'', because these computers are conceptually on different networks. An [[Internetworking|inter-network]] protocol is required to connect them.
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