DNS structure and hierarchy
Similar to the internet's DNS infrastructure, organizations also deploy their internal DNS infrastructures. To deploy an internal DNS infrastructure, organizations can select any domain hierarchy; however, once connected to the internet, they have to follow the common DNS framework . Let's understand the name server hierarchy.
Root name server
With consistent namespaces across the internet, the root name server directly responds to requests for records in the root zone and answers other requests by returning a list of the authoritative name servers for the appropriate TLD.
In order to modify the root zone, a zone file has first to be published over the internet. The root zone file is published on 13 servers from A to M across the internet.
The root zone contains the following information:
- Generic top-level domains such as
.com,.net, and.org - Globally recognized TLDs
- Country code TLDs, two-letter codes for each country such as
.infor India or.nofor Norway - Globally...
