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When this time expires, the record has to be considered invalid.
The value 0 keeps nonauthoritative servers from saving the RR to their cache memory.
The Cent OS version of this tutorial can be found here.
To complete this tutorial, you will need the following: If you are unfamiliar with DNS concepts, it is recommended that you read at least the first three parts of our Introduction to Managing DNS.
Secondary name server/slave name server acquires data about the zone by copying the data from the primary name server (respectively from the master server) at regular time intervals.
The name server is a program that performs the translation at the request of a resolver or another name server.
Primary name server/primary master is the main data source for the zone. This server acquires data about its zone from databases saved on a local disk.
A dynamic DNS service provider uses a special program that runs on the user's computer, contacting the DNS service each time the IP address provided by the ISP changes and subsequently updating the DNS database to reflect the change in IP address.
An important part of managing server configuration and infrastructure includes maintaining an easy way to look up network interfaces and IP addresses by name, by setting up a proper Domain Name System (DNS).