Typically this runs off a network share with the install process started via a small usb or network boot image (if you connect it to WDS), however there are ways to load the entire process onto USB so no network access is needed.
Typically this runs off a network share with the install process started via a small usb or network boot image (if you connect it to WDS), however there are ways to load the entire process onto USB so no network access is needed.