You can configure any Windows Server 2008 system as a DNS server. Four types of DNS servers are available:
Active Directory–integrated primary server. A DNS server that’s fully integrated with Active Directory. All DNS data is stored directly in Active Directory.
Primary server. The main DNS server for a domain that uses partial integration with Active Directory. This server stores a master copy of DNS records and the domain’s configuration files. These files are stored as text with the .dns extension.
Secondary server. A DNS server that provides backup services for the domain. This server stores a copy of DNS records obtained from a primary server and relies on zone transfers for updates. Secondary servers obtain their DNS ...