A guide to computer networks and cyber security, this book begins with a presentation of the Internet architecture then proceeds to Internet applications and the development of application software. The book then addresses the link and physical layers, making it easy for students to grasp the concepts surrounding LANs. It covers the network layer including IPv4, IPv6, routers, the various design issues and addresses the transport layer, the numerous aspects of the information infrastructure and computer security. Finally, it addresses the emerging technologies that will alter the current state of multimedia communication and datacenter/cloud computing.