I'm setting up a new Windows 2003 Domain and have a question regarding DNS and DHCP. I've set-up DNS on the first Win2003 Server when installing Active Directory and all works fine. I have made DNS on this server Active Directory Integrated. On a second Server (also a Domain Controller), I've installed DHCP, authorised it, and all works fine. I want to ensure resiliency for both services, so have installed DNS on the DHCP Server, and DHCP on the DNS Server. I have allocated seperate pools of IP addresses for DHCP on both servers so that if one server goes down, DHCP services are unaffected and there are more than enough addresses available on one server to service the entire domain. When I installed DNS on the second server, the installation again was fine. In DNSMGMT, both servers are Name Servers for the same zone which is what I want. However, I'm a little confused with the meanings of Primary and Secondary Name Servers and their fault tolerance. Looking in DNSMGMT, I can see that all the records for both servers are identical, apart from the SOA record (I assume they are being replicated because of Active Directory Integration.) Have I got two Primary Name Servers for the Domain and does that provide the best resiliency; or should one be a Secondary server? Does Active Directory Integration mean either of these servers can die and DNS/ DHCP Services will remain unaffected? Any help would be appreciated.