1、9900 单词， 4.9 万英文字符， 1.6 万汉字 外文翻译 外文原文 An Insider s Guide to the Internet David D. Clark M.I.T. Computer Science and Artificial Intelligence Laboratory Version 2.0 7/25/04 Almost everyone has heard of the Internet. We cruise the web, we watch the valuation of Internet companies on the stock market, a
2、nd we read the pundits predictions about what will happen next. But not many people actually understand what it is and how it works. Take away the hype, and the basic operation of the Internet is rather simple. Here, in a few pages, is an overview of how it works inside, and why it works the way it
3、does. Dont forgetthe Internet is not the World Wide Web, or e-mail. The Internet is what is “underneath” them, and makes them all happen. This paper describes what the Internet itself is, and also tells what actually happens, for example, when you click on a link in a Web page. 1. Introduction to th
4、e Internet The Internet is a communications facility designed to connect computers together so that they can exchange digital information. For this purpose, the Internet provides a basic communication service that conveys units of information, called packets, from a source computer attached to the I
5、nternet to one or more destination computers attached to the Internet. Additionally, the Internet provides supporting services such as the naming of the attached computers. A number of high-level services or applications have been designed and implemented making use of this basic communication servi
6、ce, including the World Wide Web, Internet e-mail, the Internet newsgroups, distribution of audio and video information, and file transfer and login between distant computers. The design of the Internet is such that new high-level services can be designed and deployed in the future. The Internet differs in important ways from the networks in other communications industries such as telephone, radio or television. In those industries, the communications infrastructure-wires, fiber
