Networking · Network Security Basics
What is a Firewall?
Use traffic rules to control which connections may enter or leave a network.
2 min micro-lessonLesson focus
What is a Firewall?Explain the role and meaning of “a Firewall” and connect it to a familiar technology scenario.
Video resources will be added as each NEST lesson is published.Learning objective
What you will understand
Explain the role and meaning of “a Firewall” and connect it to a familiar technology scenario.
Key ideas
- Filtering
- Rules
- Allowed and blocked traffic
Try it
Create allow-or-block decisions for four sample connections.
Quick recap
Use traffic rules to control which connections may enter or leave a network.