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J Internet


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J Internet

  1. 1. Introduction to the Internet
  2. 2. What is it Numerous computer networks interconnected
  3. 3. What’s on it Anything you can think of is at your fingertips, if you know where to look.
  4. 4. Internet Growth * Logarithmic Scale
  5. 5. Interesting Facts <ul><li>Internet now connects over 6000 other networks More than 1000 hosts are added each day </li></ul><ul><li>Traffic grows at 10% per month (120% per year) </li></ul><ul><li>Over 10 million people are directly connected </li></ul><ul><li>Over 25 million are indirectly connected </li></ul>Source: Navigating the Internet
  6. 6. Domain Names <ul><li>Domains identify specific networks and computers on the internet. </li></ul><ul><li>Examples: </li></ul><ul><ul><li> </li></ul></ul><ul><ul><li> </li></ul></ul><ul><ul><li> </li></ul></ul><ul><ul><li> </li></ul></ul><ul><ul><li> </li></ul></ul>
  7. 7. Reading Domain Names <ul><li>Right to left signifies the broadest to most specific </li></ul><ul><ul><li>Country code </li></ul></ul><ul><ul><li>Type of site </li></ul></ul><ul><ul><li>Site ID </li></ul></ul><ul><ul><li>Computer or network at that site </li></ul></ul>
  8. 8. Country Codes <ul><li>There are over 220 countries connected to Internet </li></ul><ul><li>Each is identified by a two-character code for international mail </li></ul><ul><li>Examples: </li></ul><ul><ul><li>.US = United States </li></ul></ul><ul><ul><li>.DE = Germany </li></ul></ul><ul><ul><li>.TW = Taiwan </li></ul></ul><ul><ul><li>.AU = Australia </li></ul></ul><ul><ul><li>.CH = Switzerland </li></ul></ul>
  9. 9. Type of Site <ul><li>The type of site is a three character identifier preceding the country code (if a country code is used) </li></ul><ul><li>Examples : </li></ul><ul><ul><li>.com = Commercial ( </li></ul></ul><ul><ul><li>.edu = Educational ( </li></ul></ul><ul><ul><li>.gov = U.S. Government ( </li></ul></ul><ul><ul><li>.mil = U.S. Military ( </li></ul></ul><ul><ul><li>.net = Network Information / Operations Centers ( </li></ul></ul><ul><ul><li>.org = Non-profit Organizations ( </li></ul></ul>
  10. 10. E-Mail Addresses <ul><li>Identify a specific user at a site separated by the “@” sign </li></ul><ul><li>Examples: </li></ul><ul><ul><li>[email_address] </li></ul></ul><ul><ul><li>[email_address] </li></ul></ul><ul><ul><li>[email_address] </li></ul></ul><ul><ul><li>[email_address] </li></ul></ul><ul><ul><li>[email_address] </li></ul></ul>
  11. 11. Using the Net <ul><li>E-Mail </li></ul><ul><li>Telnet </li></ul><ul><li>USEGROUPS </li></ul><ul><li>WWW (World Wide Web) </li></ul><ul><li>IRC (Internet Relay Chat) </li></ul><ul><li>FTP (File transfer Protocol) </li></ul>
  12. 12. Lets Go Surfin’