【正文】 666”。預(yù)期的結(jié)果：彈出提示：“此職工不存在！”。在登錄界面中輸入測試數(shù)據(jù)： 輸入測試數(shù)據(jù)測試結(jié)果顯示： 測試結(jié)果測試成功！結(jié)束語致 謝參考文獻[1] (第四版).北京:清華大學(xué)出版社,2006年[2] :人民郵電出版社,2002年[3] 張海藩,:清華大學(xué)出版社,2001年[4] :電子工業(yè)出版社,1996年[5] (第三版).北京:清華大學(xué)出版社，2007年[6] 王珊，(第四版).北京:高等教育出版社,2006年[7] 白尚旺，:西安電子科技大學(xué)出版社,2001年[8] :人民郵電出版社,2005年[9] ：人民郵電出版社，2007[10] 張瑜，李杰，：清華大學(xué)出版社，2007附錄Ⅰ英文原文About The InternetThe Internet started as a project by the US government. The object of the project was to create a means of munications between long distance points, in the event of a nation wide emergency or, more specifically, nuclear war. The project was called ARPAnet, and it is what the Internet started as. Funded specifically for military munication, the engineers responsible for ARPAnet had no idea of the possibilities of an Internet. By definition, an 39。Internet39。 is four or more puters connected by a network. ARPAnet achieved 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 puter to talk to another puter, regardless of whether it was a PC or a Macintosh. By the 8039。s ARPAnet, just years away from being the more well known the Internet had 200 puters. The Defense Department, satisfied with ARPAnet results, decided to fully adopt it into service, and connected many military puters and resources into the network. ARPAnet then had 562 puters on its network. By the year 1984, it had over 1000 puters on its network. In 1986 ARPAnet (supposedly) shut down, but only the organization shut down, and the existing networks still existed between the more than 1000 puters. It shut down due to a failed link up with NSF, who wanted to connect its 5 countywide super puters 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 puters on the (by then decided) Internet. In 1989 there were 80,000 puters on it. By 1989, there were 290,000. Another network was built to support the incredible number of people joining. It was constructed in 1992. Today The InternetToday, the Internet has bee one of the most important technological advancements in the history of humanity. Everyone wants to get 39。on line39。 to experience the wealth of information of the Internet. Millions of people now use the Internet, and it39。s predicted that by the year 2003 every single person on the planet will have Internet access. The Internet has truly bee a way of life in our time and era, and is evolving so quickly its hard to determine where it will go next, as puter and network technology improve every day. HOW IT WORKS:It39。s a standard thing people using the Internet, shopping, playing games, conversing in virtual Internet environments. The Internet is not a 39。thing39。 itself. The Internet cannot just crash. It functions the same way as the telephone system, only there is no Internet pany that runs the Internet. The Internet is a collection of millions of puters that are all connected to each other, or have the means to connect to each other. The Internet is just like an office network, only it has millions of puters connected to it. The main thing about how the Internet works is munication. How does a puter in Houston know how to access data on a puter in Tokyo to view a webpage? Internet munication, munication among puters connected to the Internet, is based on a language. This language is called TCP/IP. TCP/IP establishes a language for a puter to access and transmit data over the Internet system. But TCP/IP assumes that there is a physical connection between one puter and another. This is not usually the case. There would have to be a network wire that went to every puter connected to the Internet, but that would make the Internet impossible to access. The physical connection that is required is established by way of modems, phone lines, and other modem cable connections (like cable modems or DSL). Modems on puters read and transmit data over established lines, which could be phone lines or data lines. The actual hard core connections are established among puters called routers. A router is a puter that serves as a traffic controller for information. To explain this better, let39。s look at how a standard puter might view a webpage. 1. The user39。s puter 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 location to go to. 3. Here39。s where the tricky part es in. First, the puter sends data about it39。s data request to a router. A router is a very high speed powerful puter 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 presently operates at a speed of several gigabytes persecond. Such a speed pared to a normal modem is like paring the heat of the sun to the heat of an icecube. Routers handle data that is going back and forth. A router puts small chunks of data into packages called packets, which function similarly to envelopes. So, when the request for the webpage goes through, it uses TCP/IP protocols to tell the router what to do with the data, where it39。s going and overall where the user wants to go. 4. The router sends these packets to other routers, eventually leading to the target puter. It39。s like whisper down the lane (only the information remains intact). 5. When the information reaches the target web server, the web server then begins to se