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- Hello, and welcome to lesson nine.

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In this lesson, you'll learn how to work

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with Linux firewalls.

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Next, you'll learn about firewalld

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in videos that explain how to work

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with ports, surfaces, zones,
as well as rich rules.

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And after that, I'll show
you how to configure NAT

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and port forwarding.

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Next, I'll explain how to use
UFW in Ubuntu environments.

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This lesson ends with the lab

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which helps you practice
your firewalling skills.