Firewall
A firewall is a network security hardware device or software that monitors incoming and outgoing network traffic and permits or blocks data packets based on a set of security rules. Basically, you want to block malicious access or unnecessary access to avoid network security risks while allowing safe and legitimate traffic. In the Linux OS context, a firewall is a part of Linux services or a daemon process.
Four Types of Firewalls
Firewalls can be categorized into four groups depending on their approaches to managing data traffic.
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