how does firewall Actually Work??

I was just wondering this,

How does firewalls actually work?

I mean, Not the dumb Ver, that firewall is a hardware or software device which is configured to permit, deny, or proxy data through a computer network which has different levels of trust…

I want the Scientific Way? if possible

I think this might explain some:

If it’s not enough, here’s lots of other links:

Hope this was of some help :wink:


With out all of the technical ■■■■. It filters out specific internet traffic, as well as monitor what programs want internet access.

Thank you, I needed that because I didnt really know how to put it into a way my grandmother needed, lol
I printed it out so she can know it’s not just me saying what it does


Re: how does firewall Actually Work??

A (working) firewall intercepts.

That’s how this thingie works.

It intercepts (by it’s original definition) all ingoing and outgoing attempts to connect between (be it from outwards or inwards) YOUR PC and / or another PC / Network (including Intranet, Internet and others…)