First I should start by saying that this network is for a small non-profit company, for which I work. My job is not IT related, but because we are so small there is no IT person and because no one else in the business knows more than I do, I have become the default IT person on top of my usual responsibilities.
Our network is a bit extensive. The reason this all came up is that we actually added a new piece to it and that's when I became aware of its potential vulnerability. Here's goes nothing though...
We have a SMC Cable Gateway (rented from Comcast) connected to our switch, which feeds into our main office's LAN. Also connected to the switch is a Cisco 340 Aironet Wireless Workgroup Bridge, sending a wireless signal to 4 other buildings. Then in another building we have a Cisco 340 Aironet Wireless Access Point grabbing and extending that signal. Then there are 2 additional buildings with Cisco 340 Aironet Wireless Workgroup Bridges grabbing that signal. All of this has been set up and running for years (and before I came into the picture) and is running 802.11b (11mbps max).
We recently decided to add availability to another building. We purchased a Netgear WGE101 54 mbps Wireless Ethernet Bridge (802.11b/g). As I researched these things I became acutely aware of the vulnerability of Wireless network and wanted to find out what I can do to prevent any attack on our LAN.
Hope that's helpful, and please let me know if there is any further info I can provide, thanks in advance!