When you want name resolution to work only on specific networks Private DNS makes sure finance.domain.com doesn’t exist in the outside world while in your office it provides access to whatever fincance.domain.com is supposed to provide access to in your office.
Call back times vary, always within the same business day and generally within the hour of an order. Minimum user count and one year agreement required.
just because you can..
Doesn’t mean you should.
Of course your firm can manage a file server, mail server, DNS, domain certificates, VoIP services, and network security.