This book is intended for three classes of readers. The first is readers that want to obtain their LPI certification and obtain it at the first try. The second class of readers are those that want to learn the Linux operating system with emphasis on system administration without being interested in certification right now. The third class of readers are those using this book as a training manual in a Linux system administration course. This book covers all topics as required by the LPI 101 exam. It is also intended to teach the fundamentals of Linux administration.