Firewall

A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between a trusted internal network and untrusted external networks, such as the internet, to prevent unauthorized access and cyber threats.

Also known as: Network Firewall, FW, Security Gateway, Packet Filter, Stateful Firewall

Why learn Firewall?

Developers should learn about firewalls to secure applications and infrastructure, especially when deploying web services, APIs, or cloud-based systems. It's essential for implementing defense-in-depth strategies, complying with security regulations, and protecting against attacks like DDoS, malware, and data breaches.

Learning Resources

• docs: Cisco Firewall Documentation
• course: Firewall Fundamentals on Coursera
• tutorial: Introduction to Firewalls by IBM
• video: Firewall Configuration Tutorial on YouTube
• book: Network Security and Firewalls Book