A file backed DNS zone on such a rodc would be able to accept dynamic updates, as it has a separate database from the domain database. The DNS server service in windows server 2008 retrieves zone data from active directory in the background after it starts so that it can respond to requests for data from other zones, when the service starts; it creates one or more threads of execution to load the zones that are stored in active directory.
Purpose of the Global Names Zonein Windows Server 2008 DNS Servers GNZ is intended to aid the retirement of WINS, and it's worth noting that it is not a replacement for WINS.
In GNZ, after the creation and enabling of the Global Names zone, the administrators must manually create, add, edit and, if required - delete, name records from that zone. Modifications Necessary to DNS for accomodating Read Only Domain Controllers.
What is the purpose of the global names zone in windows sever 2008 DNS servers?
Global names zone is intended to aid the retirement of windows internet name service.
A Read Only Domain Controller can only be changed by a main Domain Controller making updates to it. Explain Background Zone Loading Background zone loading is a feature of Windows Server 2008.
In this feature, a DNS server on Windows Server 2008 loads zone data from AD DS in the background while the server restarts so that it can respond to the queries from other zones.
How is it different from the way DNS handles ordinary Domain Controllers?
Make sure to configure RODC to point to itself as the preferred DNS server.
Simply put, a domain-integrated zone on a RODC will not accept Dynamic Updates.