March 31, 2008
Chapter 6b. How Intranet Webs Work
The heart of any intranet is the World Wide Web. In many instances a large part of the reason that an intranet was created in the first place is that the Web makes it easy to publish company-wide information and forms by using the Hyptertext Markup Language (HTML). The Web allows for the creation of multimedia home pages, which are composed of text, graphics, and multimedia contents such as sound and video. Hypertext links let you jump from any place on the Web to any other place on the Web, which means that you can jump either to places inside an intranet or outside on the greater Internet from a home page.
- Intranet Webs are based on client/server architecture. Client software-a Web browser-runs on a local computer, and server software runs on a Web intranet host. Client software is available for PCs, Macintoshes, and UNIX workstations. Server software runs on UNIX, Windows NT, and a variety of other operating systems. The client software and server software need not run on the same operating system. To use an intranet Web, first launch your Web browser. If you're directly connected to your intranet, the TCP/IP software you need to run the browser will already be installed on your computer.
- When browsers are launched, they will visit a certain location by default. On an intranet, that location may be a departmental Web page or a company-wide Web page. To visit a different location, type in the intranet location you want to visit, or click on a link to the location. The name for any Web location is the URL (uniform resource locator). Your Web browser sends the URL request using HTTP (Hypertext Transfer Protocol), which defines the way in which the Web browser and the Web server communicate with one another.
- If the request is for a page found on the intranet, routers send the request to that intranet Web page. A very high-speed connection may be available, since intranets can be built using high-speed wires, and all traffic inside the intranet can be conducted over those wires. Internet connection can be much slower because of the amount of traffic on the Internet, and because there may be a variety of low-speed connections that the request from the intranet will have to traverse. The packets that make up the request are individually routed at the network level of the OSI model to an intranet router, which in turn sends the request to the Web server.
- The Web server receives the request using HTTP. The request is for a specific document. It sends the home page, document, or object back to the Web browser client. The information now is displayed on the computer screen in the Web browser. After the object is sent to the Web browser, the HTTP connection is closed to make more efficient use of network resources.
- URLs contain several parts. The first part-the "http://"- details what Internet protocol to use. The "www.zdnet.com" segment varies in length and identifies the Web server to be contacted. The final part identifies a specific directory on the server, and a home page, document, or other Internet or intranet object.
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