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When an authoritative response is received, the answer is added to cache, and it is the newly primed set of root nameservers that is used, rather than the set from the hints file. All modern and supported versions of are delivered with a built-in zone for "." of type 'hint'. We update it periodically, for example, to add an AAAA for D root a few years ago, and will do so again when the H root address changes on 1st December 2015.Changes are usually included in the next versions of to be released following the update to the root nameserver set.I find multiple explanations online and none are really clear/ is a zone definition which points to a cache of the root name servers.Once it is configured it should never need to be updated. On my system the zone definition is include in a file which contains various default zones including '.', 'localhost', '0.in-addr.arpa', and others. The root server list can also be retrieved with the dig command.At the time of writing you’ll only need to scroll down a bit on the front page to find IPv4 address 22.214.171.124 from the a.DNS Server.Use this IP address or DNS name in the window Server to Copy From and click on OK.
First of you need to start up the DNS Manager, you can find this under Administrative Tools or run with MMC shortcut Sometimes the IPv4 and/or IPv6 addresses are changed or are added to the list.Thus a good practice is to update your DNS Server Root Hints occasionally. In other words, this is a collection of NS, A and AAAA records for the root nameservers.When handling a client query for which it has no answer, a recursive server needs to know which authoritative server is responsible for the domain of the name it has been asked to resolve.
Thus the root hint zone is assumed to be mostly accurate, but they are not treated as the authoritative list of the roots.