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If you are on a "network" and are not the admin, anything is probably fair game.
f you are connected via wireless router (and are the admin/owner), you can/should log into the router and check settings (attached devices, access logs, etc.). Obviously you should use the highest level of encryption available with a super-strong password (long as possible with caps, numbers, symbols, etc.). Also, if it's an option set it up to only allow specific MAC addresses (your machines) to access it. I would turn off your SSID broadcast if possible as well.
On your computer itself, be sure that your firewall is up/operational, with no unknown "exceptions" and all file sharing disabled (and any shared folders deleted/empty). Regular scans with Malwarebytes/CCleaner/Spybot probably couldn't hurt either.
Even then, I am sure there are plenty of ways around it all if someone really wants in. YMMV.
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