Outline. Internet and World Wide Web. History of the Internet. What is the Internet? How Does Data Travel Through the Internet?
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1 Outline Internet and World Wide Web Internet World Wide Web Creating Web Pages CS 1410 Intro to Computer Tecnology Internet and World Wide Web 2 What is the Internet? The internet is a network of networks of computers connected together via devices and media such as cables, telephone lines, modems, satellites. History of the Internet The Internet was originated from the ARPANET developed by Advanced Research Projects Agency, a branch of Department of Defense in The purpose is to link researchers in the US. In early 1980s, the original ARPARNET split into MILNET and ARPANET, called DARPANET. CS 1410 Intro to Computer Tecnology Internet and World Wide Web 3 CS 1410 Intro to Computer Tecnology Internet and World Wide Web 4 Connecting to the Internet Dial-up access with Point-to-Point Protocol (PPP) Modem and Phone line, or ISDN line DSL--Digital subscriber Line High speed and permanent online connection Cable and Satellite access LAN access Permanent IP address CS 1410 Intro to Computer Tecnology Internet and World Wide Web 5 How Does Data Travel Through the Internet? IP Internet Protocol IP address Domain Name System (DNS) Domain-- edu, com, mil, gov, net, org Domain for foreign countries au, ca, de, jp, uk TCP Transmission Control Protocol CS 1410 Intro to Computer Tecnology Internet and World Wide Web 6 1
2 World Wide Web The World Wide Web (WWW) is a vast collection of online documents and information (Web pages) formatted in HyperText Markup Language (HTML) distributed over the Internet. In 1989, Tim Berners-Lee and associates proposed the World Wide Web at CERN, The European High-Energy Physics Center, in Geneva, Switzerland. The Web has ability to combine text with graphics and other multimedia CS 1410 Intro to Computer Tecnology Internet and World Wide Web 7 HTTP Hypertext Transfer Protocol HTTP The HyperText Transfer Protocol request/response model The language used by a WWW client (e.g. Netscape, Internet Explorer) to request documents from a WWW server (i.e. the program running at Web sites like amazon.com or yahoo.com) Interaction between client and server requires a request/response exchange (not like stand alone GUI) HTML The HyperText Markup Language The language used to design web pages CS 1410 Intro to Computer Tecnology Internet and World Wide Web 8 How the Web Works A Web page is an electronic document. A Web site is a collection of related Web pages. A home page is a starting page. Each Web page on a Web site has a unique address called URL Uniform Resource Locator How the Web Works A Web page URL starts with which stands for hypertext transfer protocol, the communication protocol that transfers pages on the Web. A browser is an application software used to view the Web page. CS 1410 Intro to Computer Tecnology Internet and World Wide Web 9 CS 1410 Intro to Computer Tecnology Internet and World Wide Web 10 Creating Web Pages What is the HTML? A Web page consists of HTML code. can be created using Web editors. A Web editor is an application software used to generate HTML code. CS 1410 Intro to Computer Tecnology Internet and World Wide Web 11 HTML stands forhypertext Markup Language HTML is a source language of Webformatted documents A Web-formatted document is an ASCII text file punctuated with HTML tags. Tags are HTML labels enclosed in angle brackets < > CS 1410 Intro to Computer Tecnology Internet and World Wide Web 12 2
3 HyperText Markup Language Text Mixed with Markup Tags Tags Enclosed in Angle Brackets (<H1>Introduction</H1>) What Does Markup Describe? Appearance Layout Content (Can t Enforce an Exact Look) CS 1410 Intro to Computer Tecnology Internet and World Wide Web 13 Creating and Publishing a Web Page 1. Create an HTML document 2. Place the document in a world-accessible directory (often public_html or www) on a system running an HTTP server 3. Access the web page through E.g. If the filename is omitted, a system default filename is assumed (often index.html) E.g. refers to the file index.html in hall s public_html directory CS 1410 Intro to Computer Tecnology Internet and World Wide Web 14 HTML Document Template HTML Tags HTML tags identify structural elements such as links <A> </A> headings <H1> </H1> subheadings body text paragraph <PR> numbered and indented lists <OL> </OL> line breaks <BR> </BR> CS 1410 Intro to Computer Tecnology Internet and World Wide Web 15 CS 1410 Intro to Computer Tecnology Internet and World Wide Web 16 HTML Tags HTML tags also indicate where to insert graphics how to emphasize characters where to insert horizontal lines Review Questions CS 1410 Intro to Computer Tecnology Internet and World Wide Web 17 3
4 Problem 1 Which of the following networks best describes the functional structure of the Internet? a) Metropolitan area network (MAN) b) Cross-platform network c) Local area network (LAN) d) Client/server network Problem 2 Which of the following is a client program? a) hypertext b) ARPANET c) Internet address d) Web browser CS 1410 Intro to Computer Tecnology Internet and World Wide Web 19 CS 1410 Intro to Computer Tecnology Internet and World Wide Web 20 Problem 3 Which of the following is a unique address assigned to every Web page? a) IP b) URL c) TCP d) Problem 4 The top-level domain name frequently used by ISPs is what? a) gov b) edu c) net d) com CS 1410 Intro to Computer Tecnology Internet and World Wide Web 21 CS 1410 Intro to Computer Tecnology Internet and World Wide Web 22 Problem 5 Which of the following is absolutely necessary to connect to the Internet? a) Your computer must support the network access point protocols b) Communications equipment such as a modem or ISDN adapter c) Shell access d) LAN access CS 1410 Intro to Computer Tecnology Internet and World Wide Web 23 Problem 6 Which of the following is an internal network, based on TCP/IP, that gives users the same familiar tools they use on the Internet? a) Local area network (LAN) b) intranet c) extranet d) firewall CS 1410 Intro to Computer Tecnology Internet and World Wide Web 24 4
5 Problem 7 Which of the following lets you know when a friend or business associate is online? a) Client software b) Internet Explorer c) Online services d) Instant messaging systems CS 1410 Intro to Computer Tecnology Internet and World Wide Web 25 5
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