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.
Modern firewalls offer stateful packet inspection, meaning they understand and keep track of all the flows that pass through the device. It only allows traffic to flow between . . .
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