BIND forwarders

[Thilanka Samarasekera]

If I have a zone like the following:
zone "mydomain.com" {
        type forward;
        forward only;
        forwarders {
                10.1.1.1;
                10.1.1.2;
 };
};


Can someone explain to me the logic when it comes to using the forwarders by
the named process? Also, if for some reason "10.1.1.1" goes down, what makes
the named realize that the first forwarder in the list is down and that it
should now start forwarding to the second forwarder in the list.'

Thank you in advance

Thilanka