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Physical Layer

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Definition Edit

The physical layer is the lowest layer in both the OSI and TCP/IP network models. The physical layer is the actual medium used for communications, such as copper wire, optical fiber, or radio waves.

Overview Edit

[t]his layer consists of the physical networking hardware (such as an Ethernet card or Token Ring card) that carries the data packets in a network.[1]

References Edit

  1. Technology Assessment: Cybersecurity for Critical Infrastructure Protection, at 144.
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