⃟ on Instagram: "A firewall is the first line of defense for any network. It controls incoming and outgoing traffic based on predefined security rules. Here are the core essentials you need to master for maximum protection: 1️⃣ Firewall Rules Configuration Start with a “Deny All” default rule, then allow only the traffic you actually need. Rules should be based on: • Protocol (TCP / UDP / ICMP) • Required ports • Source and destination IPs The key principle: “Least Privilege Only.” 2️⃣ Port Filt