This book presents a detailed discussion on Data Communication and Network Technologies.Features of the Book: Sample number of diagrams is used to illustrate the subject matter for easy understanding.A set of appendices on network design and network broadcasting techniques are added for professionals to refer to, design and implement networks in a medium sized organization. Solved Test Paper containing objective as well as descriptive questions is added at the end of each chapter so that the readers can evaluate their progress by comparing their answers with the answers given in a book.Set of sample papers on the pattern of the past DOEACC ‘A’ Level examination are included at the end of book.Comprehensive Glossary of technical terms and index are added for easy access to numerous terms needed for understanding the subject matter and finding answers to objective type of questions.