IP Address help for configuration of windows server 2003

  Hello, guys how are you doing?  i don't have more experience for the configuration of a windows server 2003 specially with IP Address but i know a little about IP Address classes, before i ask a question let me give you my idea in detail
  i am working in small office and we have 10 computers connected to server 2003 and the server IP = 192.168.0.1 which is class "C" and the subnet = 255.255.255.0 and there is no get way, the DNS = 192.168.0.1. right now, what i understand from this is the IP Address and the DNS server are the same, by looking this configuration  i thought that the IP Address and the DNS of the server are always the same. suddenly,  i go to another office to meet my friend when i see their configuration of the server it is different just like that serverIP= 192.168.1.100, SUBNET = 255.255.255.0, and G.W = 192.168.1.1, and the DNS SERVER = 192.168.1.45, now my question is,
 1. what is the difference between this two servers, the 1st server the IP and the DNS are the same, while the 2nd server it's IP and DNS are different?
 2. if it is possible according my configuration, suppose i have a gate way = 192.168.0.1 so, can i configure like this? serverIP= 192.168.0.2, subnet the same, G.W = 192.168.0.1 and DNS = 192.168.0.2 is this possible?

           please guys help me i am so confused about this IP Address?

                   thank you very much :-

 

1.) On your setup the DNS server resides on the same machine as your Windows Server 2003. I'm guessing Server 2003 is setup to handle DNS requests. On the other setup the DNS server is on its own machine, separate from the gateway and server. There is really no right way of doing this, it all depends on what fits your network infrastructure.

2.) Yes. That shouldn't be problem.

         
         thank you very much

On your 2nd server it means you have another machine setup as your DNS that is why they have different DNS server unlike your setup that you're dns is same as your server. For me if your Server is also your Domain server its good to have one of your dns server to the domain server for easy validation.

for your question, that is perfectly OK.

good luck