I know that this has probably been asked many times before, but i'm still going to ask it again...
My friend heard somethign about, the only way to "really" protect your computer is to have physical firewall. now i know they exsist, but what i dont know is if they really do cost 4 grand and if they really are the only "real" way to protect your computer. so, is it better to have a software firewall or a physical firewall? i guess that is the real question. I guess there is still a lil doubt in me that there really are physical firewalls, so if you could confirm that too, that would be great!

thanks for your help all!