DNS Forwarding for NIS Clients Running under the Solaris 2 or Solaris
7 Operating Environment
If an NIS client is using the DNS forwarding capability of an NIS-compatible NIS+ server, the client's nsswitch.conf file should not have the following syntax
in the hosts file:
automatically forwards host requests to DNS, this syntax causes both the NIS+
server and the name service switch to forward unsuccessful requests to the
DNS servers, slowing performance.