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  1. 1. Internet 20108004 Rui Zeng
  2. 2. Directory What’s the Intenet History of the Intenet The technology about Intenet The importance of Internet ReferencePage  2 2
  3. 3. What’s the Intenet?  The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite (often called TCP/IP, although not all applications use TCP) to serve billions of users worldwide. It is a network of networks that consists of millions of private, public, academic, business, and government networks, of local to global scope, that are linked by a broad array of electronic, wireless and optical networking technologies. The Internet carries an extensive range of information resources and services, such as the inter-linked hypertext documents of the World Wide Web (WWW) and the infrastructure to support email.Page  3 3
  4. 4. History of the Intenet  In 1983, ARPA and the U.S. Department of Defense Communications Agency was successfully developed for heterogeneous networks, TCP / IP protocol, the United States to the agreement of California at Berkeley as part of BSD UNIX, which makes the agreement has been popular in the community, thus was born the real Internet.Page  4 4
  5. 5. The technology about Intenet------Protocols  The communications infrastructure of the Internet consists of its hardware components and a system of software layers that control various aspects of the architecture. While the hardware can often be used to support other software systems, it is the design and the rigorous standardization process of the software architecture that characterizes the Internet and provides the foundation for its scalability and success. The responsibility for the architectural design of the Internet software systems has been delegated to the Internet Engineering Task Force.  The Internet standards describe a framework known as the Internet protocol suite. This is a model architecture that divides methods into a layered system of protocolsPage  5 5
  6. 6. The technology about Intenet------Protocols  The most prominent component of the Internet model is the Internet Protocol (IP), which provides addressing systems (IP addresses) for computers on the Internet. IP enables internetworking and in essence establishes the Internet itself. IP Version 4 (IPv4) is the initial version used on the first generation of todays Internet and is still in dominant use. It was designed to address up to ~4.3 billion (109) Internet hostsPage  6 6
  7. 7. The technology about Intenet------Routing  Internet Service Providers connect customers (thought of at the "bottom" of the routing hierarchy) to customers of other ISPs. At the "top" of the routing hierarchy are ten or so Tier 1 networks, large telecommunication companies which exchange traffic directly "across" to all other Tier 1 networks via unpaid peering agreements. Tier 2 networks buy Internet transit from other ISP to reach at least some parties on the global Internet, though they may also engage in unpaid peering (especially for local partners of a similar size). ISPs can use a single "upstream" provider for connectivity, or use multihoming to provide protection from problems with individual links. Internet exchange points create physical connections between multiple ISPs, often hosted in buildings owned by independent third parties.Page  7 7
  8. 8. The importance of Internet  Internet is now tied to more than 160 countries and regions, more than 40,000 sub-network, more than 500 million host computers directly to customers over 40 million, becoming the worlds most extensive information resources, public network computers. Internet is considered the prototype of future global information highway.  2012 World Economic Forum Show the power of the networkPage  8 8
  9. 9. Reference      9 9
  10. 10. THANKS