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Unit 25 Internet.docx

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Unit 25 Internet.docx
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Unit 25 Internet互联网互联网是计算机网络的国际性的集成,这些网络都理解一个标准的地址命令系统,并经中枢链路网络连在一起。互联网可以提供的服务为电子邮件、远程登陆、文件传送、电子新闻和实况对话等。可以说,互联网是你的计算机通向世界其他地方的窗口……The Internet is a giant network of computers located all over the world that communicate with each other.The Internet is an international collection of computer networks that all understand a standard system of addresses and commands, connected together through backbone systems. It was started in 1969, when the U. S. Department of Defence(美国国防部) established a nationwide network to connect a handful of universities and contractors. The original idea was to increase computing capacity that could be shared by users in many locations and to find out what it would take for computer networks to survive a nuclear war or other disaster by providing multiple paths between users. People on the ARPNET(阿帕网,因特网的前身) (as this nationwide network was originally called) quickly discovered that they could exchange messages and conduct electronic “conferences“ with distant colleagues for purposes that had nothing to do with the military industrial complex. If somebody else had something interesting stored on their computer, it was a simple matter to obtain a copy (assuming the owner did not protect it).Over the years, additional networks joined which added access to more and more computers.Today thousands of networks and millions of computers are connected to the Internet. It is growing so quickly that nobody can say exactly how many users “On the Net“.The Internet is the largest repository(宝库) of information which can provide very very large network resources. The network resources can be divided into network facilities resources and network information resources. The network facilities resources provide us with the ability of remote computation and communication. The network information resources provides us with all kinds of information services, such as science, education, business, history, law, art and entertainment,etc.The goal of your use of the Int
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