I used this as a supplementary textbook for the Network Specialist exam last year. Reading this makes it easy to solve the afternoon exam questions. ---- Systematic explanation from basic to advanced with over 400 figures and tables This book is the latest edition of Professor Tanenbaum's renowned work, "Computer Networks," which is well-known for his research on OS, networking, and distributed systems. Covering the latest technologies such as wireless LAN, IP telephony, mobile phones, and security, it systematically explains network technology from basic to advanced levels over approximately 850 pages, using over 400 figures and tables. For explanations of client-server and web applications, it uses actual working sample code for concrete explanations. In addition, it dedicates over 100 pages to security, detailing the mechanisms of encryption and authentication, as well as the methods of attackers. It can be said that this is an essential introductory book for network engineers, science and engineering students, and system engineers.