A firewall is a program that controls communication to and from your computer. It lies between the team and the rest of the network, and according to certain criteria, to decide which communication and block communication. the
Advantages of external firewalls or Personal Firewalls
1. Not have the resources of the computer. This must be clear. This is especially useful when the firewall blocks flooding attacks.
2. It is difficult (although, in principle still possible) for a Trojan horse to turn it off because it is not present on the computer that the Trojan has infected. You can not use specific communication, while completely bypassing the firewall.
3. They can be used without dependence on the operating system (s) they support.
4. No instability problems.
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