TCP/IP

1.2.4 What is TCP/IP? As we have already discussed, the Internet is built on a collection of networks covering the world, and obviously, these networks contain many different types of computers. To hold the whole thing together we have something called TCP/IP (Transmission Control Protocol/Internet Protocol).
Protocols are the rules that all networks use to understand each other. For example, there is a protocol describing exactly what format should be used for sending mail message. All internet mail programs follow this protocol when they prepare a message for delivery. Collectively, more than 100 protocols are given the common name, called TCP/IP, used to organize computers and communication devices into a network. It is glue holding it all together.
Information within the Internet is not transmitted as a constant stream from host to host; rather data is broken into small packages called segments. To divide the data (or message) into number of segments is the task of TCP. TCP marks each segment with a sequence number, the address of the recipient, the address of the sender, and it also inserts some error control information.

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