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Resolvers are considerably easier to configure than name servers. A BIND resolver supports just a few configuration directives:
domain
Sets the resolver’s local domain name
search
Sets the resolver’s search list and, implicitly, the local domain name
nameserver
Configures the resolver to query a remote name server
sortlist
Configures the resolver to sort certain A records to the beginning of responses
options
Controls miscellaneous aspects of the resolver’s configuration, such as timeouts