Operating Systems Concepts 1/e Ruth Watson Chapter 12 Chapter 12 Introduction to the Internet Ruth Watson

Operating Systems Concepts 1/e Ruth Watson Chapter 12 2 Objectives (1 of 2) Differentiate between the Internet and the World Wide Web List at least three application protocols from the TCP/IP suite Explain the directory structure of a given URL Explain what IIS is Demonstrate how to install IIS Explain what Internet Services Manager is for Demonstrate how to create a simple web page

Operating Systems Concepts 1/e Ruth Watson Chapter 12 3 Objectives (2 of 2) Explain the difference between a search engine and a subject guide Describe how web content is indexed Explain the role of a Meta tag Demonstrate how double quotes can help narrow a search Explain what Boolean operators are and list three List at least two clues that can be used to determine the validity of a web site Define portal

Operating Systems Concepts 1/e Ruth Watson Chapter 12 4 Introduction The Internet and the World Wide Web are not the same  The World Wide Web is the multimedia portion of the Internet In 2000 there were more than three million people worldwide using the Internet

Operating Systems Concepts 1/e Ruth Watson Chapter 12 5 Important Terms to Understand Apache Web Server Browser CERN Circuit switching FTP Gopher HTML HTTP Internet Meta tag Mosaic Packet switching Portal Robot Search engine Site map Spider Telnet URL Web Server World Wide Web Yahoo

Operating Systems Concepts 1/e Ruth Watson Chapter 12 6 The Internet A network of networks Began in 1969  ARPAnet (Advanced Research Projects Agency) No central authority  Therefore, impossible to state the precise size The Internet is not free just because you do not pay for it

Operating Systems Concepts 1/e Ruth Watson Chapter 12 7 The World Wide Web A subset of the Internet consisting of all computers with hypertext or hypermedia documents  These documents contain references (links) to other documents which may be on a different computer anywhere in the world  Began in 1991 at the European Particle Physics Laboratory (CERN) in Switzerland

Operating Systems Concepts 1/e Ruth Watson Chapter 12 8 Internet Protocols TCP/IP: (Transmission Control Protocol/Internet Protocol)  Suite of protocols to allow multiple platforms to communicate HTTP: (Hypertext Transfer Protocol)  Most common protocol used on the Internet for Web pages FTP: (File Transfer Protocol)  Allows files to be transferred over the Internet

Operating Systems Concepts 1/e Ruth Watson Chapter 12 9 How do you get there from here? Uniform Resource Locator (URL) Means of access, HyperText Transfer Protocol Internet Address (Web site) Document Path (Directory or Folder)

Operating Systems Concepts 1/e Ruth Watson Chapter Directory Structures on a Web Server You can guess the URL using the general form: Examples:     

Operating Systems Concepts 1/e Ruth Watson Chapter What Makes a Web Server a Web Server? Install Internet Information Services to make your server a Web server Allows you to manage Internet services, such as:  FTP  SMTP

Operating Systems Concepts 1/e Ruth Watson Chapter Become a Webmaster Manage Internet Services Develop Content for the Web Set up Web databases

Operating Systems Concepts 1/e Ruth Watson Chapter Using HTML Hypertext markup Language  Write it, or  Use an Editor Does not matter which is used, but you have to know it to fix it!

Operating Systems Concepts 1/e Ruth Watson Chapter HTML Structure  Must be at beginning and end of the Web page Head:  Includes: Basic document info Other HTML: 

Operating Systems Concepts 1/e Ruth Watson Chapter Finding Resources Effectively: Search Engines A program that systematically searches the Web for documents on a specific topic  Uses a key word or words as a query  Several search engines are available  Each search engine has its own database  No search engine is best  Uses Boolean (logical) operators  Returns “hits” or documents once search has been submitted

Operating Systems Concepts 1/e Ruth Watson Chapter Search Tips Use the Search button on the Internet Explorer Toolbar Try multiple search engines on one query Be aware of logical operators  AND,  OR, and  NOT Search on a concept: e.g., “first ladies” rather than “Eleanor Roosevelt” Set Bookmarks/Favorites

Operating Systems Concepts 1/e Ruth Watson Chapter Boolean Operators  Specify Boolean operators  And - Includes all findings of both key words  Or - Looks for only one of the specified key words  Not - Allows you to exclude certain key words  Use multiple search engines  Read online help about search criteria used for a particular search engine

Operating Systems Concepts 1/e Ruth Watson Chapter Other Resources Portals Libraries Online Magazines and Journals Miscellaneous Resources

Operating Systems Concepts 1/e Ruth Watson Chapter Summary The Internet is a network of networks URL is located in the Address Box Hypertext and hypermedia contain links to other documents Connect through ISP or LAN Search Engines are the tools to find information Learn to use keywords for searching Use multiple search engines Searches are based on Boolean operators HTML

Operating Systems Concepts 1/e Ruth Watson Chapter Questions?