Kind of queries resolver will be sending to the name
server identified in this row of the table:
iterative(1) indicates that resolver will be directing
iterative queries to this name server (RD bit turned
off).
recursive(2) indicates that resolver will be directing
recursive queries to this name server (RD bit turned
on).
recursiveAndIterative(3) indicates that the resolver
will be directing both recursive and iterative queries
to the server identified in this row of the table.