How Is IP packet Carried On A Network?

Question

Can someone provide me some details that how this conversion is possible by which it compresses the IP header (Minimum of 20 bytes) in to Token that is 1 to 4 bytes ?

Answer 1

Internet Protocol isn't very particular about how its packets are transported. The details of how an IP packet is carried over a particular kind of network are usually chosen to be convinent for the network itself. As long as the transmitter and receiver observe some convention that allows IP packets to be differeniated from any other data that might be seen by the receiver, then IP can be used to carry data between those stations. IP is carried in the data portion of the LAN frame and the frame header contains additional information that indentifies the frame an IP frame. Different LAN's have different conventions for carrying that addtional information. On an Ethernet the ethertype field is used, a value of 0x800 indentifies a frame that contains IP data. The only thing that IP cares storgly about his maximum size of a frame that can be carried on the medium.