Named updating zone log

This determines how long other DNS servers and clients cache a computer's records when the records are included in a query response.

While the directives are optional, the resource records are required in order to provide name service to a zone. Increasing this value allows remote nameservers to cache the zone information for a longer period of time, reducing the number of queries for the zone and lengthening the amount of time required to propagate resource record changes.to prevent recursive servers from sending unnecessary queries to Internet servers that cannot handle them (thus creating delays and SERVFAIL responses to clients who query for them). ) allow a secondary nameserver to only download the updated portions of a zone modified on a primary nameserver.Typically, dynamic updates are requested when either a DNS name or an IP address changes on the computer.For example, supposethat a client named oldhost is first configured in System properties with the following names.