A computer network is a system of electronic technologies that are linked in order to share information/resources and exchange files. It allows electronic communications among individual computers connected by electronic circuitry. The chapters presented in this book include detailed information on the network structure, topology, protocols and architecture. The different layers and their functions are also well-defined and described in an easy-to-read manner. Each chapter contains self-review questions that will help students to self-evaluate their understanding. Key Features — Includes current techniques associated with the network layer — Covers a wide syllabi (B.Tech, MCA, MSIS, BCA) — Review questions included at the end of each chapter — Network security, www, network management, e-mail working presented clearly