Hi, so I’m a little confused as to what a firewall can truly prevent and/or detect, specifically between an attack like an intrusion vs a Trojan horse. If a firewall can’t prevent an intrusion and/or Trojan horse, could you please explain why and what firewalls can do in terms of attacks or preventing malware from entering a PC? Any help would be greatly appreciated.
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Imagine a bunch of doors in a wall and those doors only go to one place. You can’t use that door to go anywhere else on the other side of the wall, just the place where the door has been put there to go to. Every time you go through the door someone is there asking who are you, where are you coming from, they write that down and sometimes they may not let you in if you’re not allowed. And even sometimes they ask to see what’s in your pockets and if they find any naughty stuff or think you’re trying to do something naughty they won’t let you through the door.
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