Standards/Ethernet/Ethertype

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The Ethertype indicates which protocol is encapsulated in the payoad of the Ethernet frame.

IP

The most known Ethertype is 0800 for Internet Protocol version 4 (IPv4).

In turn, Ethernet encapsulates transport layer protocols such as

TCP and UDP share a number of ports.

ARP

Address Resolution Protocol allows to find the MAC address associated to a given IP address. It has Ethertype 0806.

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