Introduction to firewalls

A firewall is a hardware or software system that prevents unauthorized access to or from a network.

The firewall can be implemented in both hardware and software, or a combination of both.

Firewalls are frequently used to prevent unauthorized internet users from accessing private networks connected to the internet. All data entering or leaving the intranet pass through the firewall, which examines each packet and blocks those that do not meet the specified security criteria.


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