This book includes the Questions and Answers most likely to be asked in the B.E.(Comp.Sc.) and MCA courses. It contains Six Chapters and each chapter contains important questions with answers. This guide covers questions related to Network Basics. Different layers of ISO-OSI MODEL .i.e. Data Link Layer, Medium Access Control Layer, Network Layer, Transport Layer etc. Besides this, it contains questions related to Bluetooth Technology and Network Security.Ample number of diagrams are used to illustrate the answers for easy understanding. In addition, four sample papers are also added at the end of this book to evaluate the progress by users of this guide. This guide will equally prove helpful for answering questions asked in able, M.Sc.:(IT), PGDCA and other IT related examinations.