Dns updating time

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.A secondary server for a zone uses an automatic updating mechanism to maintain an identical copy of the primary server's database for a zone.Examples of such mechanisms include DNS zone transfers and file transfer protocols.

The registrar provides the names of these servers to the domain registry for the top level domain containing the zone.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.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).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.

Below the root, Internet resources are organized into a hierarchy of domains, administered by the respective registrars and domain name holders.