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Ethernet

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In Ethernet the header size is 26 Bytes. Can anybody explain me how it is?
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Ethernet frame format is

Preamble sfd destination address source address length data CRC

Here destination address and source address are 6Bytes each.

Length is 2Bytes and 32 bit(4byte) CRC is used.

Preamble+ sfd( start frame decimetre)=(7+1)Bytes

If we include preamble and sfd then Ethernet frame size becomes 26 bytes.

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