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Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
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Then, if you assign the ip address to your computer/laptop,.. it will automatically pull down its FQDN from the dns server with networkmanager. This is very useful, but can also cause some annoyance if you forget about it.
In my environment, I utilize this functionality. But at home, I do not.
Its a good thing to know and investigate on your own, and decide whether it has any benefit for you.