The easiest way to find out voodoo is before you install the software on your laptop goto
https://grc.com/
and run a firewall test.
If you are not completly stealthed..... then install good old Sygate !!
I did this and had to install a firewall on my laptop.
But my setup is such that my LAN goes through an external ethernet box which is independant from the computers, so the Firewall has to be individually installed on each machine
Regards
italiano