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When it comes to networking fundamentals I can definitely recommend "Computer Networks" by Andrew Tanenbaum[0].

[0]: https://www.pearson.com/us/higher-education/program/Tanenbau...

This and the Ross/Kurose one are definitely the canonical textbooks, but Beej's Guide is a lighthearted and more easily digestible alternative if you don't want to learn everything in detail.

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