What happens if there is no access to the primary DNS server?

Question

linux

There are 2 remote offices. One has a DNS server (centos) with allowed transfers, another office has an additional zone (transfer) set up on dns-windows. What is fraught with rupture of communication between offices? Will dns work on windows if it does not have access to the main one?

Answer 1

Um, it seems to me that the desynchronization of records between these two servers will increase, that is, in office 2 they will not know about the records that office 1 knows about and vice versa, respectively, if in office 1 they poke on the corporateportal that was added to the dns of office 2 after the connection was broken then they can't get there.
And on windows, the dns that is registered will work: if 10.0.0.1 is not available, 10.0.0.2 will be picked up

Answer 2

will work, when the timeout for records ends it will stop working, I usually set it for a couple of days