LESSON 8 - The Interner, Intranet, and Extranet

• Internet

  • Worldwide collection of millions of computers and networks
  • Derived from the term “internetworking”
  • No one actually owns or runs the Internet
  • Started in 1969 as a U.S. Department of Defense project called Advanced Research Projects Agency Network (ARPANET)
  • Evolved into National Science Foundation Network (NSFNET) in 1987
• Internet Backbone

  • Foundation network linked with fiber-optic cables
  • Can support very high bandwidth
  • Several private companies operate their own Internet backbones
  • Connect network access points (NAPs)
• Hypermedia

  • Documents can include embedded references to audio, text, images, video, and other documents
• .mil 


  U.S. Military Organizations
• Symmetric DSL (SDSL)

  • Up to 1.5 Mbps in both directions
• Navigational Tools

  • Graphical Web browsers: Microsoft Internet Explorer (IE), Mozilla Firefox, Google Chrome, and Apple Safari
  • Menu options
  • View browsing history
  • Bookmarking
  • Setting viewing preferences
• Blogs

  • Short for “Weblog”
  • Journal or newsletter that’s updated frequently and intended for the general public
  • Many sites offer free space for blogs and even include posting photos: such as Blogger.com
  • Blogs on Web sites dedicated to a particular topic or organization
  • Updated with the latest news and views
• Wikis

  • Allows users to add, delete, and sometimes modify content
  • Online encyclopedia Wikipedia.org
  • Information user can also be an information provider
  • Issue with quality of information
  • Wikis have caught on at many companies