This guide reveals the technical aspects of hacking that are least understood by network administrators. It analyzes subjects through a hacking/security dichotomy that details hacking maneuvers and defenses in the same context. Chapters are organized around specific technical components and administrative tasks, providing theoretical background that prepares network defenders for the always-changing and creative tools and techniques of intruders. This book is divided into three parts. Part I introduces programming, protocol, and attack concepts. Part II addresses subject areas (protocols, services, technologies, etc.) that may be vulnerable. Part III details consolidation activities that hackers may use following penetration.