Domain Name Server Hierarchy

Avoid extending the dns domain name hierarchy more than five levels from the root domain.

Domain name server hierarchy. Each domain name consists of a number of levels domain levels separatedia 04 from each other by dots. The ohio state university raj jain 24 10 server hierarchy cont authority has the name to address translation table responsible either has the name to address translation table or knows the server who has a single server can serve multiple domains e g purdue edu and laf in us root server knows about servers for top level domains e g com. For example in the figure below edu is the top level domain berkeley is the second level domain and cs is the sub domain of berkeley. After the root the next layer in the dns hierarchy is called as tlds top level domains.

Before the domain name structure was developed computer names and ip addresses were mapped using a flat list and stored in a simple. Most prominently it translates more readily memorized domain names to the numerical ip addresses needed for locating and. Next come each domain s server will delegate to the dns server at the next lower level in the hierarchy. A domain is a subtree of the dns name space.

It consists of two parts the host name and the domain name. The domain name structure and domain name system were developed to organise and find the ip addresses of computers on large distributed networks. In domain name system dns inverted tree structure top is called the root. The domain name system dns is a hierarchical and decentralized naming system for computers services or other resources connected to the internet or a private network.

A domain can further divided in to sub domains. A fully qualified domain name is supposed to have little ambiguity. Fqdn is otherwise called an absolute domain name. The root is represented by an empty string.

To understand the domain name structure you really need to understand the problem the structure was meant to solve. Dns server root nameserver gtld cctld domain name registrar and domain name registry. The web browser the latter first accesses the name server of the relevant tld and receives back from it the numerical ip address allocated to it thus allowing the corresponding host computer to be located. Eos is the host name.

If you are deploying dns in a private network and you do not plan to create an external namespace register the dns domain name that you create for the internal domain.