Note: If the primary DNS server responds with 'SERVFAIL,' the DNS request isn't sent again to the secondary DNS server. If the primary DNS server becomes unreachable, the end user device resends the query to the secondary DNS server.
Note: If the primary DNS server responds with 'SERVFAIL,' the DNS request isn't sent again to the secondary DNS server. If the primary DNS server becomes unreachable, the end user device resends the query to the secondary DNS server.
