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Welcome to lesson 13.

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In this lesson you will learn how to configure a Linux firewall.

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I'll first explain about network ports, which are an essential component in Linux firewalls.

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Next I'll explain how firewalls are working in general, and after that we can zoom in

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and talk about the most common Linux firewall solutions, UFW, Firewall-D, and IP tables.

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You'll also learn about NF tables, the latest firewalling solution that has been introduced

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to Linux.

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And as always, this lesson ends with the lab as well as the lab solution.