cnp3-ebook

protocols/ethernet

French

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The datalink layer addresses used in Ethernet networks are often called MAC addresses. They are structured as shown in the figure below. The first bit of the address indicates whether the address identifies a network adapter or a multicast group. The upper 24 bits are used to encode an Organization Unique Identifier (OUI). This OUI identifies a block of addresses that has been allocated by the secretariat [#foui]_ that is responsible for the uniqueness of Ethernet addresses to a manufacturer. Once a manufacturer has received an OUI, it can build and sell products with one of the 16 million addresses in this block.

4 years ago

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