This book on concepts and technologies for System and Network Administration covers the various aspects of designing a system and network concepts. This book is intended to be a basic reading material to network and system administration concepts based on Harmonized Curriculum, Ethiopia.This book have been used to effectively explain several of system and network concepts. The first chapter gives a brief introduction of the Network and System administration and is thus important for the rest of the book.Other issues like system and network components, server concepts user Management concepts in Linux and windows. This book gives you a framework a way of thinking about system administration problems rather than narrow how-to solutions to particular problems. This book is unique because it looks at system administration from this holistic point of view; whereas most other books for System Administration focus on how to maintain one particular product. With experience, however, all System Administration learn that the big-picture problems and solutions are largely independent of the platform. This book will change the way you approach your work as a System Administrator