Communications and computer networks refer to a network of telecommunication which enables different computers and computerized peripherals to interconnect via a wire or wireless medium and communicate and share data with each other. There are different types of computer networks like personal area network, local area network, metropolitan area network, wide area network, internetwork, etc. This book will serve as resource guide for students and researchers. It will discuss in detail various techniques and advanced concepts related to computer networks and their use in communication. As this field is emerging at a rapid pace, this text will help readers to better understand the concepts of this area. The ever growing need of advanced technology is the reason that has fueled the research in the field of communication and computer networks. This book is appropriate for students seeking detailed information in this area as well as for experts.