books

books

The concept of full-stack was pronounced dead at the close of 2019.
2020 Stack is the new name for the new generation.

windrose

Firewall layer

Network stack

Firewalls trap rogue use of your network. In a world where one person's idea of fun is to break into another person's private domain, firewalls have become an essential component in limiting the damage that can be done.

Layers

Five-layered approach to network operations:

Firewalls can be simply understood and implemented with iptables—a service running on your back-end server—or with dedicated hardware devices custom built to filter network packets. Both tools operate at the port level, allowing or disallowing use of services into, or out of, your network, on a port-by-port basis.