Ethernet is not a single protocol but an entire collection of different standards. These standards come from the IEEE and all of them start with 802.3 in their name. Ethernet is also pretty old, the first memo about Ethernet was written by Bob Metcalfe back in 1973.

Ethernet "lives" in the Physical and Data Link layers of the OSI Model. At the physical layer, Ethernet uses two types of media: copper and optical fiber.

Some additional information about Ethernet can be found in the following notes:


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