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"Network and system security provides focused coverage of network and system security technologies. It explores practical solutions to a wide range of network and systems security issues. Chapters are authored by leading experts in the field and address the immediate and long-term challenges in the authors? respective areas of expertise. Coverage includes building a secure organization; cryptography; system intrusion; UNIX and Linux security; Internet security, intranet security; LAN security; wireless network security; cellular network security, RFID security, and more. This compilation of 13 chapters is tightly focused and ideally suited as an essential desk reference in this high-growth subject area."

"We will focus on these three components in a computer network. But what is a computer network? The reader should be aware that our use of the phrase computer network , from now on, will refer to the traditional computer network.A computer network is a distributed system consisting of loosely coupled computers and other devices. Any two of these devices, which we will from now onrefer to as network elements or transmitting elements without loss of generality, cancommunicate with each other through a communication medium. In order for these connected devices to be considered a communicating network, there must be a set of communicating rules or protocols each device in the network must follow to communicate with another device in the network. The resulting combination consisting of hardware and software is a computer communication network or computer network in short."