Firewall

Network security is very important. That's why a firewall is a common device that you'll find on networks. Modern firewalls can filter information all the way up to OSI layer 7. They recognize the exact application you're using and can make decisions on whether to allow or block that traffic based on the application that's flowing through it.

Firewalls can also encrypt information in and out of your network. If you need to connect to a remote side but you want to send everything securely, many firewalls provide IPsec (internet protocol security) encryption mechanism.

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It is a system made to prevent unauthorized access to or from a private network. They can be implemented in both hardware and software.

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Dispite popular beliefs, this is not actually a wall made of fire and with that in mind you cannot disable a firewall with a fire extinguisher.

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