Based on your addressing scheme for each of your five networks, it appears that you are using NAT and each of your networks is actually a subnet of a single domain. If this is the case then it is possible to join all of your client computers regardless of the subnet to the domain and host them on one DC, if your not concerned with performance or reliability.

What’s your plan should your single DC fail? One DC leaves you with a single point of failure for 500 clients, if it goes down your entire network goes with it. You did not mention physical location of your subnets, are they all local or are some remote? Depending on connection speeds your going to have very slow logon times at best for all remote sites and any downstream subnets in a local configuration. Some of your slower connections could fail all together during logon leaving them useless.

Have you thought out your DHCP and DNS schemes? If your planning on running these services your DC your going to be taxing it’s resources pretty hard, especially during start of business hours when logon traffic is highest.

Best practice would suggest setting up one DC per subnet. DHCP should be local to each subnet and each subnet should host a replica DNS server to speed things along. Remember, W2K DC’s use Active Directory which relies heavily on DNS.

You may consider re-thinking your plan and requesting additional resources for your project or you could be in for a lot of sleepless nights!

Good Luck!

I have following Networks

10.1.1.0 , 10.1.2.0 , 10.1.3.0 , 10.1.4.0 and 10.1.5.0

and I have 100 Clients on each network so How I join different Networks on One Domain Controller kindly tell me

Thanks for reply