It installs a DHCP server, yes. You can turn this off in the network setup box. The server will not respond to anything except Receiver boxes - it also lets another server serve the box first (ie, it only serves packets with secs>=5 and the correct vendor-unique ID field).

They're not BOOTP, no. A strange spin on uPnP is used to find the NFS server & portmapper port number.

Hugo