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notes/School/Analyse/IPV4.md

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Internet protocol Version 4 (IPV4)

  • IP is the principal communications protocol in the network layer.
  • IP has the task of delivering packets from source host to destination host based on IP addresses.

IP defines datagram structure that encapsulate the data to be delivered.

An IP datagram (packet) consists of a header part an a text part. (payload)

The header has a 20 byte fixed part an a variable length optional part.

!IP-packet.png

Some of the fields in a packet are not always used.