Domain Name System is a database that links domains such as www.DomainSelectorTool.com to a specific IP address, such as 111.22.333.444. Linking domains to addresses is just the beginning because domain name system has many more features in addition to host name to address mapping. The mappings of addresses to names known as records are stored in a database. A domain name system database also stores additional records such as the domain owner’s registration information.
The domain name space consists of a “tree” of domains. Each node in the tree has one or more resource records, which hold information associated with the domain names. The tree then sub-divides into zones. The zone consists of a collection of connected nodes authoritatively served by an authoritative DNS nameserver. When a system administrator wants to let another administrator control a part of the domain name space within their respective zone of authority, they can delegate control to the other administrator. This splits a part of the old zone off into a new zone, which comes under the authority of the second administrator's nameservers. The old zone ceases to be authoritative for what goes under the authority of the new zone. |
