A virtual wall in the security system world is designed to protect our system from unwanted traffic and unauthorized access to our system. The security system in Linux OS is known as Linux Firewall, which monitors and governs the network traffic (outbound/inbound connections). It can be used to block access to different IP addresses, Specific subnets, ports (virtual points where network connections begin and end), and services.
We have a daemon’s name called Firewalld which is used to maintain the firewall policies. A dynamically managed firewall tool in a Linux system is known as Firewalld, it can be updated in real-time if there are any changes in the network environment.
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