You’ve probably heard that firewalls are an important security protection, but do you know why that is? Many people don’t, if references to firewalls in TV shows, movies, and other forms of popular media are any indication.
A firewall sits between a computer (or local network) and another network (such as the Internet), controlling the incoming and outgoing network traffic. Without a firewall, anything goes. With a firewall, the firewall’s rules determine which traffic is allowed through and which isn’t.
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