This book presents a comprehensive understanding of the fundamental concepts, principles, and technologies that underpin modern computer networks. It covers a wide range of topics including network architecture, protocols, and standards; data communication; network security; and emerging technologies. The content is structured to guide readers from basic concepts to more advanced topics, ensuring a thorough grasp of both theoretical and practical aspects of computer networking. Case studies and real-world examples are included to illustrate the application of concepts in various networking scenarios.