Once Server 2012 has been Installed there are several further configuration aspects. First off, the Server needs to be named and should be set appropriately eg; DC, WDS, EXCH etc.
On login, the Server Manager screen appears, select Local Server and then click the blue computer name, this can then be changed to the desired entry.
Next select the blue IPv4 address line, right click the ethernet adapter and select the IPv4 option, click properties and set the IP address, Subnet mask and Default gateway. If you have a separate DNS server then enter its’ IP address here, if you plan to use this server as the DNS Server then enter 127.0.0.1 and it will know to look to itself for Domain Name Resolution.