You're right. Did not think this through...lack of familiarity and experience being a novice.
I guess the worst that could happen is that he parks outside and leeches bandwidth.
I do not know your router, however, most routers' passwords can be changed through its menu. Viper_Security, I have a question for you because you are very knowledgeable about security matters: Would anyone's wifi security also depend upon the Network and Sharing Center's Changed advanced sharing settings? I ask because at school, my laptop has all those settings off with password on, and suddenly no more "seeing" other people's devices in my Explorer's left column. Means they can no longer "see me" either?
Wi-Fi security No,
if your network and sharing center settings are turned off you can no longer see people connected to the same LAN and vise versa, if it's on you can see other devices that have their sharing turned on as well.
However if someone has connected to your network before and they do as the OP had mentioned and leech off Wi-Fi, if both parties have sharing turned on, then you can,1. see the person(s) connected to your network via the computer name under the "Network" tab in the left hand menu in FileExplorer. and 2. View their files that have been allowed to be shared (they also can view yours if your sharing is turned on)
So if you're worried about that, the solution is simple, change the Wi-Fi password via the Router Gui
Edited by Viper_Security, 27 August 2016 - 04:38 AM.