Domain Names

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A brief intro about Internet Domain names

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Domain Names

  1. 1. Valid Internet Addresses
  2. 2. Internet Addresses <ul><li>Also known as Domain names </li></ul><ul><li>Translate a named address ( www.google.com ) to a numbered IP address (74.125.45.100) </li></ul><ul><li>All computers on the Internet have a numbered address </li></ul>
  3. 3. IP Addresses <ul><li>Every networked computer has a numbered address called an IP Address </li></ul><ul><li>It works like a home address and allows other computers or servers to send data to your computer </li></ul><ul><li>Most IP Addresses are in the following format xxx.xxx.xxx.xxx </li></ul>
  4. 4. Domain Names <ul><li>When you type a domain name into the address bar, your computer looks up the IP Address that is associated with that name. </li></ul><ul><li>That information is held in a DNS (Domain Name Server) </li></ul><ul><li>If the DNS is not working properly, your computer is unable to find the correct IP Address and is not able to go to that web site. </li></ul>
  5. 5. Formatting <ul><li>http://www.google.com </li></ul><ul><li>http is the Internet protocol that determines what your computer should do with the data. In this case, it should get the data through a web browser and display a web page </li></ul><ul><li>Others are: ftp:// https:// and more </li></ul>
  6. 6. http:// www .google.com <ul><li>www tells your computer to find the address on the W orld W ide W eb </li></ul><ul><li>Sometimes, you can leave off the www and the address will still work (google.com) </li></ul>
  7. 7. http://www. google .com <ul><li>The part right before the “.com” is called the root domain </li></ul><ul><li>In this case, Google is the root domain name </li></ul>
  8. 8. http://www.google. com <ul><li>.com determines the type of site that you are visiting, although it’s not always perfectly clear. </li></ul><ul><li>.com was supposed to be used for businesses or com pany’s on the web </li></ul>
  9. 9. .what? <ul><li>.net: was supposed to be for general websites, but is seldom used </li></ul><ul><li>.org: is used by org anizations like non-profits </li></ul><ul><li>.edu: is used by edu cational institutions like colleges and schools </li></ul><ul><li>.gov: is used by the United States Gov ernment </li></ul>
  10. 10. Sub Domains <ul><li>Subdomains are used to help keep different parts of a site separate from other parts. They may be different services that a company wants to distinguish between. </li></ul><ul><li>Example, http:// gmail .google.com , where gmail is Google’s email service, so it has it’s own address. </li></ul><ul><li>Also note that the “www” is gone </li></ul>
  11. 11. What Not To Do <ul><li>Internet Addresses follow simple rules: </li></ul><ul><ul><li>No spaces in addresses </li></ul></ul><ul><ul><li>all letters are lowercase </li></ul></ul><ul><ul><li>periods (.) separate parts of an address </li></ul></ul><ul><ul><li>only a few special characters are allowed </li></ul></ul><ul><ul><ul><li>. / - _ </li></ul></ul></ul>

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