Transcript Chapter 8
Chapter 8 The Internet: A Resource for All of Us 1 Internet History ARPANet Research project 1969 – 4 computers US Dept. of Defense and Rand Corporation Goal was to send messages between computers without any one computer being in charge TCP / IP TCP: Transmission Control Protocol Divides messages into packets Packets may take different routes through the network Reassembles packets at the destination TCP / IP IP: Internet Protocol Handles addressing Gives each packet a label with destination address Routes packets to multiple computers Internet History Tim Berners-Lee 1990 – created World Wide Web Visualized a spider’s web made of links Text link – hypertext Icon or image link – hyperregion Internet History Marc Andreessen 1993 – designed Mosaic, first graphical browser Attractive images and graphical interface Netscape – produced by a company founded by Andreessen Internet Explosion Factors 1. 2. 3. 4. TCP/IP standard Ability to link from site to site Ease of use with graphical browser Growth of PCs and LANs Internet Connection Computer with modem or Network card Internet Service Provider (ISP) Online Service Browser Using the World Wide Web Hyperlink connection to another page or document on the web Easy movement between documents Usually easy to recognize Using the World Wide Web Home page – the first page of a web site URL – uniform resource locator Unique address of a Web page http: Hypertext Transfer Protocol Domain name Using the World Wide Web Top Level Domains (Within the U.S.) .com – business site .edu – education .mil – military .gov – government .net – business .org – non-profit organizations Country domains use 2-letter abbreviations Ex: mx for Mexico, ca for Canada Browser Features Frames Rectangular sections Can operate separately May look cluttered Hot List also called “bookmarks” or “favorites” List of favorite sites and their URLs Browser Extras Plug-ins Software that adds capabilities to your browser Examples: Adobe Acrobat – used to view .pdf files Shockwave – view complex animation Media Player – play video or listen to audio Browser Extras Java: general purpose programming language Applets – programs written in Java and included in web pages. Applets can play games, display animation, perform calculations, virtually anything you want to do. Internet Search Search engine Metasearch Software that searchs parts of the web Results vary by search engine Uses several search engines Directory Yahoo: humans review web sites and organize them by content Non-Web Parts of the Internet FTP: file transfer protocol Download files to your computer Upload files to another computer Telnet: log in to a remote computer Email: read / send / organize messages Internet Problems Netiquette – appropriate behavior in network communications..email, chat rooms, etc. Decency Act of 1996 – an attempt to censor material on the WWW. Later declared unconstitutional. Some Interesting Sites www.carpoint.com (actually takes you to autos.msn.com) You can search for new and used cars, compare prices, find out if what you want is available near your city. Assignment: Go to this site. Look up the Honda (make) S2000 (model). What kind of vehicle is it? ___________________________________________ Some Interesting Sites www.expedia.com or www.travelocity.com Research hotel rates, airline tickets, flight availability, cruises, rental cars and more. Assignment: Go to one of these sites. Pretend you want to fly from El Paso to Mazatlan (round trip of course) over the Thanksgiving break (depart 11/27 return 12/1). What is the lowest fare you can find? ___________ What is the 3-letter code for the El Paso airport? ________ What is the 3-letter code for the Mazatlan airport? _______ Some Interesting Sites www.half.com (owned by Ebay) Buy or sell new or used books, cds, dvds, video games and more. Great place to look for bargains on textbooks (or to sell your used books).