developer-roadmap/roadmaps/devops/content/firewall@f3tM2uo6LLSOmyeFfLc7h.md

Firewall

A firewall is a network security device that monitors and filters incoming and outgoing network traffic based on an organization's previously established security policies. It acts as a barrier between a trusted internal network and untrusted external networks, such as the internet, by analyzing data packets to determine whether they should be allowed or blocked. Setting up a firewall involves defining rules that specify which ports, protocols, and IP addresses are permitted to communicate with your infrastructure, effectively minimizing the surface area for potential unauthorized access.

Visit the following resources to learn more:

• @article@What is Firewall?
• @article@Types of Firewall
• @article@Why do we need Firewalls?
• @video@Firewalls and Network Security - SimpliLearn