e non- UNIX user, the demand for and use of data began to explode. Web servers were already deployed throughout the Internet. A plethora of information existed long before the popularity caught up with the technology. However, when the interfaces were developed to enable a user to point and click, the demand to access more systems and more information exploded. Web-based servers are merely a logical extension of the distributed com- puting environment, originally the purpose of the Internet. Groups of file servers and database machines exist on the Net. When a user attempts to retrieve information from an organization's home page or Web page, as shown in Figure 7-14, the Web spawns remote procedure calls for the data Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hil Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. X.25, Internets, Intranets, and Extranets Chapter 7 Web-hosting Figure 7-14 customer PC using T1, XDSL, 56K The World Wide with leased IP Web page content created & uploaded to Web server using www.customer.com Real audio FTP client is forwarded to Real video Web server which Front page routes to customer Others Web page Internet "Any user" server 1 server 2 Web page www.customer.com disk space identified as managed by .com Leased disk space Forward server www.customer.com Address www.customer.com linked serviced by Internic Web server IP/domain tables that resides on different machines. As a page is accessed from a local server, the pieces comprising the actual file may be kept elsewhere. Therefore, links and calls to these other servers are built into the Web page using a Hypertext Transfer Protocol (HTTP) and a Hypertext Markup Language (HTML) to facilitate the ease of use. A call may go to a file server for a small text file, whereas a second request links to a graphic file on a second server. The user sees the final result, without knowing that the data has come from several di