Originally posted here by alttec
Regardless of the amount of locked routers, internal encryption and authentication, and or other hardware and software attempts to secure a wireless connection the fact that any machine is vulnerable just by the nature of sending and receiving airborne signal. The current posts provide valid and valuable advice particularly in the learning area and I would just add a not if your are willing to go a little deeper. From w2k forward learn about the internal ip security and port filtering capabilities of your o\s and try them out. It may me an interesting experience in closing the door.
Actually, wireless can be very secure "line of site" DoD applies that I believe.