The Application Layer WWW

The Application Layer WWW - Veton Këpuska 1 Computer...

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Unformatted text preview: February 13, 2012 Veton Këpuska 1 Computer Networks 2 The Application Layer: WWW February 13, 2012 Veton Këpuska 2 WWW: Brief Historical Overview Originated from the work done at CERN (Switzerland) by physicist Tim Berners-Lee. March 1989: Tim Berners-Lee proposed web linked documents as a solution to the problem of communication between numerous researchers of various European countries participating in nuclear research. September 1990: The first (text-based) prototype was operational. December 1991: a first public demonstration was given at Hypertext’91 conference in San Antonio Texas. February 1993: Marc Andreessen at the University of Illinois start developing the first graphical browser: Mosaic. Mosaic become so popular that made Andreessen to form Netscape Communications Crop whose goal is to develop clients, servers, and other Web software: 1995: Record initial public offering of $1.5 billion. 1998: Sold to AOL for $4.2 billion. W3C (World Wide Web Consortium) by MIT and CERN: www.w3.org February 13, 2012 Veton Këpuska 3 WWW: Architectural Overview WWW consists of vast worldwide collection of documents or Web pages. Each page may contain a link ( hyperlink ) to other pages anywhere in the world. The link can be followed by clicking on it. Vannavar Bush in 1945, a visionary MIT professor of Electrical Engineering Department, invented the idea of having one page point to the another (now called hypertext ). Browser are programs that allow the users to view those pages. Hyperlinks are strings of text that links to other pages. They are often highlighted, by underlining, displayed in different color or both. Non-graphical browsers (Lynx) are not as popular as Graphical browsers (Microsoft’s Internet Explorer, Netscape's Navigator). Voice-based browsers are currently being developed. Basic model of how the Web works is shown in Fig.7-19. February 13, 2012 Veton Këpuska 4 WWW: Architectural Overview The parts of the Web Model February 13, 2012 Veton Këpuska 5 The Client Side Browser is a program that can: Display a Web page Catch mouse clicks to items on the displayed page. When an item is selected the browser follows the hyperlink and fetches the page selected. Embedded hyperlink needs a way to name any other page on the Web. Pages are named using URLs ( Uniform Resource Locators ). February 13, 2012 Veton Këpuska 6 The Client Side URL has three parts: 1. Name of the protocol (http) 2. DNS name of the machine where the page is located ( www.abcd.com ) 3. Optional name of the file containing the page (products.html).Optional name of the file containing the page (products....
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This note was uploaded on 02/11/2012 for the course ECE 5535 taught by Professor Staff during the Spring '10 term at FIT.

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The Application Layer WWW - Veton Këpuska 1 Computer...

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