Network security is essential for homes, government organizations, and enterprises of all sizes. It is a strategy and provisions designed to protect the network infrastructure and the data traversing it. The number and types of attacks are enormous and the devices used to defend against them are necessarily complex. This book provides an overview of network security and covers test methodologies that can be used to validate the effectiveness, accuracy, and performance of network security devices, policies, and process. By combing a realistic mix of legitimate application traffic emulation and comprehensive set of threat vectors, these methodologies are designed to help network operators and security professionals find the right balance between application performance and security in today’s hyper-scale, dynamic world.