Firewalls and allow rules

Definition and example

Firewalls and allow rules is the focus of this lesson. A firewall applies network rules to traffic. Restrictive allow rules expose only required services; rules should be reviewed and documented. Practice: Create a short note for ‘Firewalls and allow rules’ in a local training document. Apply the idea to a fictional or deliberately provided sample, record what you checked, and note one limitation. Do not use real credentials, private records or systems without written permission. The task asks you to apply that idea in a small example: What is a safer default firewall policy for an unused service. Before you run the code, predict what should happen. Then Inspect the result produced by the exercise and compare it with your prediction. If the result differs, change one relevant line and run it again. Testing one change at a time makes the cause of a result easier to understand.