If you have an Ignite server, then you can boot off the network (I think your LAN cable needs to be plugged into the Core I/O for this). In order to do this, your Ignite server must be on the same subnet as the target, or you must have a boot helper on the same subnet.
Another option if you have a tape drive attached is to create a build tape. I'm not very familiar with the process to do this, but maybe someone else on here can help with this one?