NA Lesson - 17

Understanding DNS in Windows Server 2003

Networks

 DNS Namespace

• The naming system on which DNS is based is a hierarchical and logical tree structure called the DNS namespace.
• The DNS namespace has a unique root that can have any number of subdomains. In turn, each subdomain can have more subdomains.
• For example, the root “” (empty string) in the Internet namespace has many top-level domain names, one of which is com. 
• The domain com can, for example, have a subdomain for Ravenshaw University RavenshawUniversity.com which in turn can have a further subdomain for ITM, called itm.RavenshawUniversity.com.

 Fully Qulalified Domain Names

• Every node in the DNS domain tree can be identified by an FQDN. For example, the FQDN for the itm server can be  itmserver.ravenshwuniversity.com., which is the concatenation of the host name (itm server) with the primary DNS suffix (ravenshwuniversity.com), and the trailing dot (.). 
• In this cae the trailing dot is a standard separator between the top-level domain label and the empty string label corresponding to the root.

Internet Domain Namespace

The DNS root (the topmost level) of the Internet domain namespace is managed by the Internet Corporation for Assigned Names and Numbers (ICANN).

ICANN coordinates the assignment of identifiers that must be globally unique for the Internet to function, including Internet domain names, IP address numbers, and protocol parameter and port numbers.

Q. Describe the structure for DNS namespace .describe also how internet namespace is organized and governed?