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Physical Connections - Electromagnetic Waves (2 of 2) |   |
Networks
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Radio waves on the other hand can travel long distances around the world as they are reflected by the earth's ionosphere. The computers in a WAN will be connected by cables within a site, but the sites will be connected to each other either directly by radio or microwaves, or by the international telephone network. The international telephone network itself uses electrical or fibre optic cable and radio or microwave communication. |