Network Layer Protocols
It provides IP addressing, subnets, IP routing and packet filtering.

The IP layer packet

IP Header

Data Field (Transport protocol data)

IPv4 Address classes Four byte IP address example: 10000000.00000110.00000010.00000001 = 128.6.2.1


  Class    The First byte   Network/Host Addr.  

   A       0-127            N.H.H.H

   B       128-191          N.N.H.H

   C       192-223          N.N.N.H

   D       224-239          (multicast)

   E       240-247          (experimental)

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