Firewalls enforce security policies by controlling network traffic. Configuration involves defining rules that specify which traffic is allowed or denied based on source, destination, port, and protocol.
A secure firewall configuration starts with a default-deny approach, allowing only necessary services. Logging is enabled to record denied connections and detect suspicious activity.
Firewall rules must be reviewed regularly to remove obsolete entries and reduce security risks. Proper firewall management is critical for protecting systems from unauthorized access.
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