From the CD you can install prerequisites needed for ServerSetup to run.
In the Install prerequisites program, you can click the Advanced button to see what will be installed, and select or unselect if you want to do it another way.
To install the .Net Framework an internet connection is required. If the server where the installation is done don't have an internet connection, the correct .Net framework must be installad from another source. (see system requirements)
A warning will be given when installing prerequisites if the installation of .Net framwork fails, and ServerSetup will not start if .Net is not installed on the server.
Thereason is that the prerequisites installation program on the CD contains only the bootstrapper for the .Net installation and not the entire setup program (approx 2.5 MB vs 250MB)