How would you configure a firewall on a Linux system using iptables

To configure a firewall using iptables, I would first check current rules with iptables -L. I would then

define my policy with commands like iptables -P INPUT DROP to drop all incoming traffic by default. I would

add rules using iptables -A INPUT -p tcp --dport 22 -j ACCEPT to allow SSH traffic. After setting up

rules, I would save the configuration using iptables-save to ensure they persist after a reboot.