Recursive Query
If a name server cannot answer a query because it does not contain an entry for the host in its database, it may recursively query name servers higher up in the hierarchy. This is known as a recursive query or recursive lookup.
In principle, authoritative name servers suffice for the operation of the Internet. However, with only authoritative name-servers operating, every DNS query must start with recursive queries at the root zone of the Domain Name System and each user system must implement resolver software capable of recursive operation.
Read more about this topic: Name Server
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