Networking Essentials / Seeing the network
Lesson 28 of 30
Firewalls
A firewall allows or blocks traffic based on rules, like ports and addresses. Default-deny means block everything except what you explicitly allow.
Key points
- Host firewalls: ufw, Windows Firewall
- Network firewalls protect whole networks
- Default deny is safest
Quiz · +10 XP
What does 'default deny' mean?
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