What is the function of a firewall in network security for vessels?

The primary function of a firewall in network security for vessels is to filter incoming and outgoing traffic to prevent unauthorized access. A firewall acts as a barrier between a trusted internal network and untrusted external sources, such as the internet. By analyzing data packets and applying established rules, a firewall determines whether to allow or block traffic based on security policies, which helps protect the vessel's network from potential threats, such as unauthorized access, malware, and other cyber attacks.

This functionality is crucial in a marine context, where ensuring the integrity and availability of operational systems is vital for safety and security. Firewalls enhance the overall security posture by controlling what data can enter or leave the network, thereby mitigating risks associated with cyber threats.