"Computer Networks" by Andrew S. Tanenbaum is a comprehensive textbook that covers the fundamental concepts of computer networks. The book is now in its fifth edition, which was published in 2010. The book provides a detailed overview of the architecture, protocols, and technologies used in modern computer networks. The author, Andrew S. Tanenbaum, is a renowned expert in the field of computer science and has written several influential books on operating systems, computer networks, and software engineering.