i have an 8port switch plugged into it, and a wireless access point.
Was all wireless, but had to add some wires to gain back enough speed/reliability for moving large database type files(also helps with ping in quake). The wireless is now mainly going to be for laptops and computers that are too difficult to reach with cables.
It has a firewall. I dont setup mac addresses or anything like that tho.
I have a pile of network stuff that I know could all be replaced with a single unit, but I dont care about that so much.
Jason