about resolving on a child zone

[Tech W.]

hello,


I have the domain saying it's example.com.
I defined a NS (and its A rcd) as below:

my.example.com.  IN  NS  mydns.example.com.
mydns.example.com.  IN  A  11.22.33.44


Also I added this A record in both main DNS and the child zone's DNS (mydns.example.com).

www.my.example.com.  IN  A  55.66.77.88


When I query for www.my.example.com, who will respond for it? the main DNS or that mydns?

Can I set only www.my.example.com in main DNS while not in mydns?

Thanks for your kind helps.

Regards.



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