What you use as your primary nameserver does not have to be what your registrar thinks is your primary nameserver.
Actually, to be a bit more technical, the registrar keeps a list of NS records -- but does not distinguish between them in any way. So the *only* way a registrar will know which of your DNS servers is primary is if they check with you (by asking you, or checking your SOA record).
> Many people use a nameserver not listed at the registrar as their primary.
True -- this is called a "stealth nameserver." One that you know about, but others do not know about.
I'm told that when a resolver contacts a root nameserver it is the luck of the draw as to which one of your registered nameservers it will respond with. I know that when I try it I get varied results.
Again to be technical (as Len has taught me <G>), it isn't the root nameservers, but the domain parent nameservers. The root nameservers know which DNS servers handle the .com domain (the *.gtld-servers.net servers). It's the gtld-servers.net DNS servers that are the parent servers for the .com (and .net) domains.
The parent servers will actually return *all* of the NS records, not just one of them. And, most people don't realize that, but the DNS resolver will normally contact all the DNS servers, not just one of them (so that the DNS resolver can see which responds quickest, to help speed up future queries).
-Scott
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