This book is a step-by-step guide describing how to implement, maintain, and expand the NNMi management tool. It is a practical guide, based on experience managing networks in a wide scale of network operation centers. It shares best practices and explains a lot of non-technical issues that arise during implementations and operations. Each topic has practical examples where the reader can practice while reading the book. The book is written for the following audience: Monitoring solution designers, who plan how to implement NNMi, Network engineers, who plan to start managing their network, System administrators, who start administering NNMi, Network monitoring operators, who want to learn how to use NNMi. If you belong to any one of the above professions, then this book is for you. It's also for professionals who describe themselves as beginners, or intermediate-level professionals. The book is also suitable for old-version NNM users who wish to switch to NNMi.