|wanderer actually said 3 servers if you think about what he said and how he said it.|
Two DC's (for redundancy) and a file server. The idea being, you never want to load DC's down with any extra services you don't have to.
To add to what he was saying about a data center (ie: server room) aside from air conditioning you'll also want UPS protection for all electrical devices (servers, switches etc) and if possible, a backup generator.
have read about additional domain controllers , does additional DC mean a DC with the same name? say SERVER . So in all the 300 clients in the login screen will it show just SERVER.. or do i need multiple DCs like SERVER1,SERVER2,SERVER3 etc?
They would have to be uniquely named with unique (static) IP addresses.
You can easily find all the info on creating a redundant DC by seaching MS's website or just searching on google.
The point being, if your first DC fails, the redundant one takes over with no downtime.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.