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Packet Format
Each protocol family has its
own organization of information within logical packets of
data. All devices communicating by a protocol agree on that format,
and use the agreed-upon specifications to construct packets, and to
“decode” the information sent over the network. For example,
everyone might agree that the first piece of information in the packet
is the logical address of the sending device, the second piece of information
is the logical address of the intended receiver, the third piece is
a number representing the length of the message, and the fourth piece
is the message itself.
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