Understanding the DNS (Domain Name System)

What is Domain Name Systems?
The Domain Name System distributes the responsibility of assigning domain names and mapping those names to IP addresses by designating authoritative name servers for each domain. Authoritative name servers are assigned to be responsible for their supported domains, and may delegate authority over sub-domains to other name servers.
This mechanism provides distributed and fault tolerant service and was designed to avoid the need for a single central database.

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