Optiv Cybersecurity Dictionary

What is a Firewall?

Firewalls are network security devices or systems that monitor and regulate network traffic (incoming and outgoing) based on defined security rules. Firewalls can be network or host-based. Hardware-based network firewalls filter inter-network traffic (typically between an internal and external network like the internet), while host-based firewalls control traffic in and out of the computers on which they reside.

 

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