You can install the Windows Server OS from a deployment server environment. For the advanced user, you can create a customized Windows Imaging Format (WIM) image for your server on a system running Windows Deployment Services (WDS). After this installation image file is created, you can boot your server from its network card and select the image from the WDS system for unattended deployment.
For more information about WDS, go to: http://technet.microsoft.com/library/hh831620.