Internet 计算机系统概论（双语课件）专业英语课件.ppt

Internet Page no : 344 The internet is a collection of local, national, and international computer networks that are linked together to exchange data and distribute processing tasks. Internet growth A computer on the internet that provides services such as web pages, e-mailboxes, or data routing services is referred to as an internet host or host . Internet traffic is the number of bytes transmitted from one internet host computer to another computer. Internet technology A network service provider maintains a series of communications links for internet data. The NSP helps to access the information from a computer that is located thousands of miles away. Internet service providers(ISP) When you connect your computer to the internet, you do not connect to the backbone(NSP). Instead, you connect it to an ISP that in turn connects to backbone. An ISP is a company that maintains an internet host computer providing Internet access to businessmen, organizations, and individuals. A connection that uses a phone line to establish a temporary internet connection is referred to as a dialup connection. Internet addresses and domains An IP address is a set of four numbers between 0 to 255 that are separated by periods. For example 53 is the IP address of coke company A computer with domain name is popularly referred as site The name of the host computers is called fully qualified domain name(FQDN) or Domain name . A domain name ends with a three letter extensions called top level domain URLs URL stands for uniform resource locator A URL is the address of a document on the computer . The components of URL include the WEB protocol, the web server name ,the folder in which the page is stored, and the filename of the page HTTP stands for Hyper Text Transfer Protocol. A web server is a computer that uses special software to transmit web pages over the internet. Example for URL is http://www. Fooyong.Com/information/specials.htm http ? protocol www. F ? web server