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Ethernet frame
A data packet on an Ethernet link is called an Ethernet packet, which transports an Ethernet frame as its payload.
An Ethernet frame is preceded by a preamble and start frame delimiter (SFD), which are both part of the Ethernet packet at the physical layer. Each Ethernet frame starts with an Ethernet header, which contains destination and source MAC addresses as its first two fields. The middle section of the frame is payload data including any headers for other protocols (for example, Internet Protocol) carried in the frame. The frame ends with a frame check sequence (FCS), which is a 32-bit cyclic redundancy check used to detect any in-transit corruption of data.
==Structure==
A data packet on the wire and the frame as its payload consist of binary data. Data on Ethernet is transmitted with most-significant octet (byte) first; within each octet, however, the least-significant bit is transmitted first, except for the frame check sequence (FCS).
The internal structure of an Ethernet frame is specified in IEEE 802.3-2012.〔 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 other higher-speed variants of Ethernet support larger frames, known as jumbo frames.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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