Computer networks and communications are the future of our existence. Even today, they are deeply integrated into our lives. The objective of the book is to give a general view of the different areas of computer networks, and its applications. This book is meant for students who are looking for an elaborated written script on computer networks and communication. The listed topics cover the advanced concepts of computer networks, ad-hoc networks, protocols, key issues regarding establishment of networks, data control, etc. The chapters in this book are written by experts, and this book also contains practical examples to illustrate the concept of communication.