Computer Science for Education

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===== TCP/IP =====

Unordered List ItemThe Internet doesn't look like having a 'service' center. It is different from the telephone network, all the services are provided at the end point, on users' computers.

The Internet does no more than routing packages in it. And it even allows these thing to occur:
  * data corruption
  * lost data packets
  * duplicate arrival
  * out-of-order packet delivery; meaning, if packet 'A' is sent before packet 'B', packet 'B' may arrive before packet 'A'. Since routing is dynamic and there is no memory in the network about the path of prior packets, it is possible that the first packet sent takes a longer path to its destination.

And these are based on the most basic protocol -- the Internet Protocol (IP).


To make the network reliable, the will also need the Transmission Control Protocol (TCP).

TCP is one of the two original components of the suite (the other being Internet Protocol, or IP), so the entire suite is commonly referred to as TCP/IP. Whereas IP handles lower-level transmissions from computer to computer as a message makes its way across the Internet, TCP operates at a higher level, concerned only with the two end systems, for example a Web browser and a Web server. In particular, TCP provides reliable, ordered delivery of a stream of bytes from a program on one computer to another program on another computer.

So the two fundamental protocols are called the Internet Protocol Suite, commonly known as TCP/IP.

Computer Science for Education

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