Firewall Behavior | What Is a Three-Way Handshake in TCP? | TCP 3-Way Handshake (SYN, SYN-ACK,ACK)

Firewall: In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted internal network and untrusted external network, such as the Internet. https://en.wikipedia.org/wiki/Firewall_(computing)

If you know the basics of networking but have been mystified by firewalls, this course is for you. This course will give you the detailed fundamentals of how a stateful firewall operates and how it functions in a network. ... https://www.youtube.com/watch?v=kGGkfYiIHdQ