A firewall is a security device that filters traffic that is not allowed in the organization, while allowing legitimate traffic. Firewalls are positioned at the entry point in an organization or between critical network modules to create various security access policies. Most firewalls filter at Layer 4, based on the TCP or UDP port number. Some firewalls can function even at Layer 7, being application aware and filtering traffic based on this.
Many firewalls also can be configured to create encrypted tunnels between sites so that all the information between the firewalls is encrypted. Some firewalls can also proxy traffic . . .
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