Originally Posted by gweminence
Do you have a home network? Nearly all modern routers have built-in hardware NAT firewalls, making firewalls on individual machines (that are behind such a router) redundant.
Note: FIREWALL...not antivirus.
Not 100% redundent.
If one system manages to get infected, your clean side is now dirty.
But for the most part, if your WiFi is well locked down (to prevent stray users
on the clean side), Software FW mostly consume resources.