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 WORLD-INFOSTRUCTURE > WHAT IS THE INTERNET
  1. What is the Internet?
  2. How the Internet works
  3. Acessing the Internet
  4. Internet services
  5. Operating the net: overview
  6. Who owns the Internet and who is in charge?
  7. Internet, Intranets, Extranets, and Virtual Private Networks
  8. In Search of Reliable Internet Measurement Data
  9. Global Data Flows
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Transmission Control Protocol/Internet Protocol (TCP/IP)
TCP and IP are the two most important protocols and communication standards. TCP provides reliable message-transmission service; IP is the key protocol for specifying how packets are routed around the Internet.

More detailed information can be found here

http://www.anu.edu/people/Roger.Clarke/II/Pri...