Firewall Literacy
Understand host firewalls — configure only machines you own.
1. Allow vs Deny Thinking
Default deny and least exposure.
15 min
+23 XP
2. ufw / firewalld Overview
Common Linux host firewalls.
15 min
+23 XP
3. Reading Firewall Status
Observation commands on YOUR host.
15 min
+23 XP
4. Lab: Document Your Rules
Export status notes — do not open the world.
25 min
+23 XP
5. Quiz — Firewalls
Firewall literacy check.
10 min
+23 XP