Ethernet

Question

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

Answer 1

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.

Comments

excluding data part.

Frame size=data + header size