Red Hat Enterprise Linux 6 and hence Oracle Linux 6 do no longer install a Graphical Desktop when doing a default server installation. If you want a Graphical Desktop you can customize the initial installation, or do it afterwards using the following command:
yum groupinstall "X Window System" Desktop "General Purpose Desktop" \
"Graphical Administration Tools" "Legacy X Window System compatibility"
sed -i 's|id:3:initdefault:|id:5:initdefault:|g' /etc/inittab
shutdown -r now
However, keep in mind that you can generally run GUI applications using SSH with X forwarding or Tiger VNC without the need to install X Windows Server on the Linux server or running a Graphical Desktop.
Unfortunately, the GUI version of system-config-network under EL 6 requires the Network Manager service, which you might not want to run on a server platform. Anyway, to use the connection editor GUI, the following should do:
yum install NetworkManager-gnome
service NetworkManager start
chkconfig NetworkManager on
Alternatively, simply edit the following files to configure your DNS, hostname and hosts file:
service network restart
You can change the DNS configuration in the nm-connection tool when you edit the interface configuration and use manual IP addressing. The /etc/hosts file you need to edit using a text editor.
It seems to me that RHEL is not the only OS though to follow a certain demographic user profile development, where you have the expert (Server) on one, and the computer illiterate (Desktop) on the other end. I question whether or not the expert prefers command-line, I don't, but some are vehemently promoting it.