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- [Jungwoo] We often hear about security breaches

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involving organizations that lose millions of dollars.

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A lot of these cybersecurity incidents

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stem from the vulnerabilities in computer networks.

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If your network is down, you cannot get any work done.

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Therefore, network security should be a top priority,

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which starts with developing an overall understanding

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of fundamental network security concepts

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and essential tools you can adopt immediately

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without worrying about the cost.

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You need to learn how to set up

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different types of firewalls,

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analyze packets and network protocols,

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conduct intrusion detection and prevention,

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and monitor your network using various tools.

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I'm Jungwoo Ryoo.

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I'm excited to share the knowledge

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I've gained over the years as a professor,

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researcher, and practicing network engineer.

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Now let's get started with protecting

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your network with open source software.