毕业设计外文文献翻译文档格式.docx

1、学生姓名班级学号指导教师信息工程学院1、外文文献The History of the InternetThe Beginning - ARPAnetThe Internet started as a project by the US government. The object of the project was to create a means of communications between long distance points, in the event of a nation wide emergency or, more specifically, nuclear war

2、. The project was called ARPAnet, and it is what the Internet started as. Funded specifically for military communication, the engineers responsible for ARPANet had no idea of the possibilities of an Internet. By definition, an Internet is four or more computers connected by a network. ARPAnet achiev

3、ed its network by using a protocol called TCP/IP. The basics around this protocol was that if information sent over a network failed to get through on one route, it would find another route to work with, as well as establishing a means for one computer to talk to another computer, regardless of whet

4、her it was a PC or a Macintosh. By the 80s ARPAnet, just years away from becoming the more well known Internet, had 200 computers. The Defense Department, satisfied with ARPAnets results, decided to fully adopt it into service, and connected many military computers and resources into the network. AR

5、PAnet then had 562 computers on its network. By the year 1984, it had over 1000 computers on its network. In 1986 ARPAnet （supposedly） shut down, but only the organization shutdown, and the existing networks still existed between the more than 1000computers. It shut down due to a failied link up wit

6、h NSF, who wanted toconnect its 5 countywide super computers into ARPAnet. With the funding of NSF, new high speed lines were successfully installedat line speeds of 56k （a normal modem nowadays） through telephone linesin 1988. By that time, there were 28,174 computers on the （by then decided） Inter

7、net. In 1989 there were 80,000 computers on it. By 1989, there were 290,000. Another network was built to support the incredible number of peoplejoining. It was constructed in 1992. Today - The InternetToday, the Internet has become one of the most important technological advancements in the history

8、 of humanity. Everyone wants to get on line to experience the wealth of information of the Internet. Millions of people now use the Internet, and its predicted that by the year 2003 every single person on the planet will have Internet access. The Internet has truly become a way of life in our time a

9、nd era, and is evolving so quickly its hard to determine where it will go next, as computer and network technology improve every day. HOW IT WORKS:Its a standard thing. People using the Internet. Shopping, playing games,conversing in virtual Internet environments. The Internet is not a thing itself.

10、 The Internet cannot just crash. It functions the same way as the telephone system, only there is no Internet company that runs the Internet. The Internet is a collection of millioins of computers that are all connected to each other, or have the means to connect to each other. The Internet is just

11、like an office network, only it has millions of computers connected to it. The main thing about how the Internet works is communication. How does a computer in Houston know how to access data on a computer in Tokyo to view a webpage?Internet communication, communication among computers connected to

12、the Internet, is based on a language. This language is called TCP/IP. TCP/IP establishes a language for a computer to access and transmit data over the Internet system. But TCP/IP assumes that there is a physical connecetion between one computer and another. This is not usually the case. There would

13、 have to be a network wire that went to every computer connected to the Internet, but that would make the Internet impossible to access. The physical connection that is requireed is established by way of modems,phonelines, and other modem cable connections （like cable modems or DSL）. Modems on compu

14、ters read and transmit data over established lines,which could be phonelines or data lines. The actual hard core connections are established among computers called routers. A router is a computer that serves as a traffic controller for information. To explain this better, lets look at how a standard

15、 computer might view a webpage. 1. The users computer dials into an Internet Service Provider （ISP）. The ISP might in turn be connected to another ISP, or a straight connection into the Internet backbone. 2. The user launches a web browser like Netscape or Internet Explorer and types in an internet

16、location to go to. 3. Heres where the tricky part comes in. First, the computer sends data about its data request to a router. A router is a very high speed powerful computer running special software. The collection of routers in the world make what is called a backbone, on which all the data on the Internet is transferred. The backbone prese