What Is Domain Name Hierarchy. FQDN is otherwise called an absolute domain name. At the absolute top is the DNS root domain which is nameless.
The second-level domain name cornelledu is owned and managed by Cornell University. The DNS namespace tree has a unique root and large number of sub-trees. The root name server is the name server for the root zone.
These rules say that the domains always go right to left.
There are 13 root DNS servers all over the world. Domains are designed in a hierarchical structure. The domain name system DNS is an Internet protocol for translating domain names to IP addresses. It associates various information with domain names assigned to each of the participating entities.