Please Whitelist This Site?

I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :)

If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads.

If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK.

Thanks for your understanding!

Sincerely, Charles Kozierok
Author and Publisher, The TCP/IP Guide


NOTE: Using software to mass-download the site degrades the server and is prohibited.
If you want to read The TCP/IP Guide offline, please consider licensing it. Thank you.

The Book is Here... and Now On Sale!

The whole site in one document for easy reference!
The TCP/IP Guide

Custom Search







Table Of Contents  The TCP/IP Guide
 9  TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
      9  Name Systems and TCP/IP Name Registration and Name Resolution
           9  TCP/IP Name Systems: Host Tables and Domain Name System (DNS)
                9  TCP/IP Domain Name System (DNS)
                     9  DNS Name Registration, Public Administration, Zones and Authorities

Previous Topic/Section
DNS Hierarchical Authority Structure and the Distributed Name Database
Previous Page
Pages in Current Topic/Section
1
234
Next Page
DNS Geopolitical (Country Code) Top Level Domains and Authorities
Next Topic/Section

DNS Organizational (Generic) Top Level Domains and Authorities
(Page 1 of 4)

The top of the DNS name hierarchy is managed by a central authority, which controls the entire name space by virtue of deciding what top-level domains (TLDs) are allowed to exist. Obviously, it is very important that a great deal of thought go into how the TLDs are chosen; a poor design at this top level would make the entire hierarchy poorly reflect the actual structure of organizations using the name space.

There are any number of ways that the creators of DNS could have chosen to structure the Internet's name hierarchy. One obvious possibility would be to structure the Internet based on geopolitical boundaries: countries, states and so forth, as we saw in a topic in the last section. Another sensible idea is to structure the name space based on types of organizations. One could imagine other possible ways to divide up the names of the world's computers as well.

The beauty of the hierarchical name space is that we don't have to choose between different methods of structuring the name space. We can use more than one technique at the same time, and this is exactly what was done when DNS was first implemented. Both of the methods I described above, based on organization type and geography, were used for TLDs. This gives multiple options for name registration for most groups and individuals. I’ll begin here by discussing organizational TLDs; geopolitical ones are the subject of the topic that follows.


Previous Topic/Section
DNS Hierarchical Authority Structure and the Distributed Name Database
Previous Page
Pages in Current Topic/Section
1
234
Next Page
DNS Geopolitical (Country Code) Top Level Domains and Authorities
Next Topic/Section

If you find The TCP/IP Guide useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider purchasing a download license of The TCP/IP Guide. Thanks for your support!
Donate $2
Donate $5
Donate $10
Donate $20
Donate $30
Donate: $



Home - Table Of Contents - Contact Us

The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005

© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.