wtf is book-computer-networks?

This repository hosts a free digital textbook about computer networks. It's a complete, readable version of "Computer Networks: A Systems Approach," a well-known university-level book that explains how networks actually work, from the physical wires and radio signals all the way up to the software applications you use every day. The book takes a "systems approach," meaning it doesn't just describe isolated concepts in isolation. Instead, it shows how each layer of a network depends on and connects to the others. You'll learn about things like how data gets split into packets, how routers decide where to send information, how the internet handles errors and delays, and how applications like email and video streaming use the underlying network infrastructure. The explanations are intended to be accessible to people learning the subject, not just experts. The repository provides the book in three formats, EPUB (for e-readers), MOBI (for Kindle), and PDF, so you can read it on whatever device you prefer. You can also read it online directly through the official website linked in the README. The files include SHA256 checksums, which is a way to verify you've downloaded the exact, unmodified version. Anyone curious about how the internet and computer networks actually function could use this: students in a computer science or engineering program, people switching into tech careers, founders building network-based products who want to understand the foundations, or just curious learners. Rather than reading marketing materials or oversimplified explanations, you get a structured, authoritative textbook that's been made freely available. The book is based on the original open-source version, adapted and distributed here for easier access.