If I have contradictory NS records for my domain:
dig +trace example.com
example.com. 172800 IN NS ns1.webfaction.com.
example.com. 172800 IN NS ns2.webfaction.com.
example.com. 172800 IN NS ns2.mydyndns.org.
Which one[s] will be queried by my DNS client? Does the ordering matter? How can I tell the ordering?