static leases and domain on different interfaces

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Hello

I have a simple question about the DNS and static DHCP DNS registration.

If i have two interfaces with different domains (eg site1.localdomain and site1.localdomain) and the domain in the General Setup is set to mysite.com, does the DNS server register the domain "host1.site1.localdomain" for the static entry "host1" or the default one "mysite.com"?

I want to prevent leaks between site1 and site2. Can i restrict it in such a way, that site2 can not access dns entries in site1? For example, site2 gets no results for "host1.site1.localdomain".

Is there an easier way, to get this done?

Thank you for your help