Sorry if this is a stupid question, but I know very little about wireless networking. I have four comps in my house working on a wireless network utilizing an Apple Airport Extreme base station. All but one of these machines has wireless N, and the one that doesn't have wireless N is hooked to the base station via ethernet. I recently bought a vintage iBook Clamshell with a wireless B airport card installed, ( purchased, but it hasn't arrived yet). If I attempt to connect the Clamshell to my wireless network, is it going to pull my entire wireless network down to "B" speed? Also, I have seen where certain older wireless cards don't support WPA2 encryption. Is there a way to rectify that? Thanks for the help!