A firewall functions analogously, looking at each packet of data to determine where it came from and where it is going, or both, and deciding if the packet should be accepted and allowed to continue on its way or if it should be denied or dropped. In the physical world, a guard might make decisions based on where a person is trying to go, where they came from, or both before admitting them. It protects the computer or network by limiting points of access and providing criteria that must be met before being allowed to enter. A firewall around a computer or network is like the wall around a castle or city.
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