Hi I have a question regarding firewalls. From my understanding whenever there is a firewall up on a computer or network does that mean that network is completely invisible from the outside. I have a free Zone Alarm firewall set up on my Win XP Pro computer that is hooked up to a router with four other computers. I always wondered if an attacker attacked my external IP would they be able to see my whole network and then choose which computer they would like er what? This is a rather confusing topic for me and just really wanted to know if firewalls are like the end all enhancement to security... cuz with my limited knowledge it seems like i'm utterly invinceable thank you for your time