The Internet continues to grow at a very rapid rate. Together with this growth, there is an accompanying growth of the technologies on which it is based. These technologies make use of TCP/IP as their foundation. To start to make sense of all these interrelated systems, it is important that today's computer user be aware of the technologies on which the Internet is based. This book introduces those technologies and is aimed at the Internet user who wishes to understand the technologies on which much of today's business and recreational computing is based. As such, the intention of this book is to give a succinct overview of 'how it all works' rather than provide a comprehensive reference work. This book will help you quickly obtain an understanding of the technological principles behind the Internet/communications revolution in both your working and recreational lives, and: provides a thorough understanding of intranets, extranets and the Internet; explains all about: how e-mail delivers mail the domain name service how the Internet finds computers the problems facing network designers the basics of computer security issues some new technologies such as WAP, Bluetooth, UMTS and NAPSTER; and, shows you how your office or home network really works. Keith Sutherland is a Microsoft Certified Systems Engineer specialising in TCP/IP, IIS and SQL server. For the last 25 years, he has been an independent consultant and lecturer working throughout the IT industry. As a result, he has trained many thousands of industrial and commercial staff over that period. Currently, he divides his time between lecturing, consultancy and research work. His client list includes many Blue-Chip companies together with government and international organisations. This book explains, in simple terms, how Internet technology works, and how this can affect a business; and, gives a rapid overview of core technologies, cutting through the Jargon.