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Caching name servers are often also recursive name servers—they perform every step necessary to answer any DNS query they receive.

To do this the name server queries each authoritative name-server in turn, starting from the DNS root zone.

Caching name servers (DNS caches) store DNS query results for a period of time determined in the configuration (time-to-live) of each domain-name record.

DNS caches improve the efficiency of the DNS by reducing DNS traffic across the Internet, and by reducing load on authoritative name-servers, particularly root name-servers.

Every domain name appears in a zone served by one or more authoritative name servers.

This is known as a recursive query or recursive lookup.This service is performed by the server in response to a service protocol request.An example of a name server is the server component of the Domain Name System (DNS), one of the two principal namespaces of the Internet.The most important function of DNS servers is the translation (resolution) of human-memorable domain names and hostnames into the corresponding numeric Internet Protocol (IP) addresses, the second principal name space of the Internet which is used to identify and locate computer systems and resources on the Internet. It allows you to connect to other computers or networks by simple names instead of requiring memorization of IP addresses.The Internet maintains two principal namespaces: the domain name hierarchy The top hierarchy of the Domain Name System is served by the root name servers maintained by delegation by the Internet Corporation for Assigned Names and Numbers (ICANN).

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