Update: Ultimate Links - Computer firewall

Firewalls make it possible to filter incoming and outgoing traffic that flows through your system. A firewall can use one or more sets of “rules” to inspect the network packets as they come in or go out of your network connections and either allows the traffic through or blocks it. The rules of a firewall can inspect one or more characteristics of the packets, including but not limited to the protocol type, the source or destination host address, and the source or destination port.

Firewalls can greatly enhance the security of a host or a network. They can be used to do one or more of the following things:

To protect and insulate the applications, services and machines of your internal network from unwanted traffic coming in from the public Internet.

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