Reddit reviews Data and Computer Communications

So this questions comes up not infrequently. For more specific guidelines, I'd recommend searching this subreddit a bit.

I hear network warrior is good.

Personally, I learned from this dry, boring text. However it IS good.

Data and Computer Communications by William Stallings

This is the book that I used in my "Network Theory & Test" course in university. This book has some pretty deep material with networks in the logical and physical realm. The previous edition to the one I listed also had chapters on crypto and how that worked.