Question

what is Linux firewall?

Answer 1

A firewall is a network security program that controls the incoming and outgoing connections based on the rules that are set. Linux has a default firewall I.e iptables. Using iptables an administrator can set the rules of the firewall.

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Answer 2

A Firewall is a security system, either hardware- or software-based, that controls incoming and outgoing network traffic based on a set of rules defined by network security team. A firewall controls access to the resources of a network through a positive control model. This means that the only traffic allowed onto the network defined in the firewall policy is; all other traffic is denied.