🔐 Network Security & Cyber Security Basics – Hindi Tutorial What happens if a hacker misuses open ports to send wrong signals or inject malicious files? In this video, we explain how firewalls and security controls protect networks from such attacks. 📌 Topics Covered ✔ Why Open Ports are a Security Risk ✔ What is a Firewall? ✔ Firewalls & Port Management ✔ Packet Filtering Firewall ✔ Access Control Rules (ACLs) ✔ Intrusion Prevention System (IPS) ✔ Application Layer Filtering ✔ Proxy Services