Ethernet Frame - Structure

Structure

A data packet on the wire is called a frame and consists of binary data. Data on Ethernet is transmitted most-significant byte first. Within each byte, however, the least-significant bit is transmitted first.

The table below shows the complete Ethernet frame, as transmitted, for the payload size up to the MTU of 1500 octets. Some implementations of Gigabit Ethernet (and higher speed ethernets) support larger frames, known as jumbo frames.

802.3 Ethernet frame structure
Preamble Start of frame delimiter MAC destination MAC source 802.1Q tag (optional) Ethertype (Ethernet II) or length (IEEE 802.3) Payload Frame check sequence (32‑bit CRC) Interframe gap
7 octets 1 octet 6 octets 6 octets (4 octets) 2 octets 42–1500 octets 4 octets 12 octets
← 64–1522 octets →
← 72–1530 octets →
← 84–1542 octets →

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