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Ch2 presenting the internet.


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Ch2 presenting the internet.

  1. 1. Chapter2 Presenting the Internet
  2. 2. Outline <ul><li>The Internet’s Major Services: </li></ul><ul><li>Understanding the World Wide Web. </li></ul><ul><li>How the Web Works. </li></ul><ul><li>Web Browsers and HTML Tags. </li></ul><ul><li>URLs . </li></ul><ul><li>Ways to Access a URL. </li></ul><ul><li>Terminology used the Internet. </li></ul><ul><li>Search Techniques </li></ul>
  3. 3. The Internet’s Major Services <ul><li>The World Wide Web </li></ul><ul><li>Electronic mail </li></ul><ul><li>News </li></ul><ul><li>File Transfer Protocol </li></ul><ul><li>Chat </li></ul><ul><li>Instant messaging </li></ul><ul><li>Online services </li></ul><ul><li>Peer-to-peer services </li></ul>
  4. 4. The Internet’s Major Services <ul><ul><li>Electronic mail </li></ul></ul><ul><ul><li>Instantaneous transmission of documents </li></ul></ul><ul><ul><li>File Transfer Protocol (FTP) </li></ul></ul><ul><li>Sends and receives files </li></ul><ul><li>Chat </li></ul><ul><li>Public real time conversation </li></ul><ul><li>Instant messaging </li></ul><ul><li>Private real time conversation </li></ul>
  5. 5. The Internet’s Major Services <ul><li>Internet service provider (ISP): </li></ul><ul><li>a company that provides local or regional </li></ul><ul><li>access to the Internet backbone. </li></ul>
  6. 6. Connections <ul><li>Dialup </li></ul><ul><ul><li>Connects to Internet through phone line </li></ul></ul><ul><ul><li>Modem connects to the phone line </li></ul></ul><ul><ul><li>Slow connection </li></ul></ul><ul><li>High-speed access </li></ul><ul><ul><li>Connect through a special line </li></ul></ul><ul><ul><li>2 – 25 times faster than dialup </li></ul></ul><ul><ul><li>DSL, Cable, T1 are common </li></ul></ul>
  7. 7. Understanding the WWW <ul><li>Enables users to view specially formatted documents, called Web pages , on the Internet, also called WWW . </li></ul><ul><li>There is a different between the web and the internet : </li></ul><ul><ul><li>The Web is a service ( a system for </li></ul></ul><ul><ul><li>accessing documents ) that is supported by the Internet. </li></ul></ul>
  8. 8. How the Web Works <ul><li>Web documents can be linked together </li></ul><ul><li>because they are created in a format known </li></ul><ul><li>as hypertext. </li></ul><ul><li>Hypertext : systems provide an easy way </li></ul><ul><li>to manage large collections of data, which can include text files, pictures, sounds, movies, and more. </li></ul><ul><li>The Web uses a special protocol, called the hypertext transfer protocol, or HTTP. </li></ul>
  9. 9. How the Web Works <ul><li>HyperText Markup Language (HTML). </li></ul><ul><li>This language allows a document’s author to insert hypertext links , also called hyperlinks or just links in the document. </li></ul><ul><li>HTTP and hypertext links are the foundations of the World Wide Web . </li></ul>
  10. 10. How the Web Works <ul><li>Hypertext document more commonly called </li></ul><ul><li>a Web . </li></ul><ul><li>Web site : is a collection of related Web pages. </li></ul><ul><li>Publishing the page :Copying a page onto </li></ul><ul><li>a server and, also is called posting </li></ul><ul><li>or uploading . </li></ul>
  11. 11. Web Browsers and HTML Tags <ul><li>A browser :Software program that enables you to access hypertext documents on the Web and then open the documents on the user’s computer. </li></ul><ul><li>Two most popular Web browsers: </li></ul><ul><ul><li>Microsoft Internet Explorer </li></ul></ul><ul><ul><li>Netscape Navigator </li></ul></ul>
  12. 12. Using a Browser And The WWW <ul><li>Browser starts on the home page </li></ul><ul><li>Navigating the web </li></ul><ul><ul><li>Enter a URL in the browser </li></ul></ul><ul><ul><li>Click a link </li></ul></ul><ul><ul><li>Links are typically blue underlined words </li></ul></ul><ul><ul><li>Image maps are picture links </li></ul></ul><ul><li>When finished, close the browser </li></ul>
  13. 13. Understanding The Internet <ul><li>Browsers </li></ul><ul><ul><li>Read and translate the HTML </li></ul></ul><ul><ul><li>Display web content </li></ul></ul><ul><li>Uniform Resource Locator (URL) </li></ul><ul><ul><li>Address of a web page </li></ul></ul>
  14. 14. Ways to Access a URL <ul><li>Type the URL in a browser’s address box. </li></ul><ul><li>Click a hyperlink that is linked to that URL. </li></ul><ul><li>Choose a URL stored in your browser’s Favorites or Bookmarks list. </li></ul>
  15. 15. Terminology used the Internet <ul><li>Bookmark Frequently visited Web </li></ul><ul><li>page saved in a browser. </li></ul><ul><li>Search tools: </li></ul><ul><ul><li>Directories </li></ul></ul><ul><ul><li>Search Engines </li></ul></ul><ul><li>Keyword search: Searching for </li></ul><ul><li>information by typing one or more </li></ul><ul><li>words. </li></ul>
  16. 16. Searching the Web <ul><li>The Web is unorganized </li></ul><ul><li>Directories </li></ul><ul><ul><li>Categorize the Internet </li></ul></ul><ul><li>Search engines </li></ul><ul><ul><li>Find sites by keyword </li></ul></ul>
  17. 17. Search Techniques <ul><li>Quote the exact phrase </li></ul><ul><li>Use the Boolean operators </li></ul><ul><li>Avoid common words </li></ul><ul><li>Use the site’s advanced tools </li></ul>
  18. 18. Boolean operators <ul><li>Four Boolean operators that are sometimes used in Web searches are </li></ul><ul><ul><li>AND </li></ul></ul><ul><ul><li>OR </li></ul></ul><ul><ul><li>NOT </li></ul></ul><ul><ul><li>NEAR </li></ul></ul>
  19. 19. Chapter 2A End of Chapter