Network security, though, is hard to do right, especially because it does not matter to create a network to do something (like connecting the central office to the factory), but by making it not do something (allow access to a defined community of sick villain) explains. Network Security Architecture design is generally accepted practices that make networks possible resistance to damage and invasion. Relatively little of this book related to software configuration details, and it is generally not a paean to Cisco Systems Product Wall. - David Topics covered: How to design a data network (including those that carry voice over IP) to be as inherently secure as possible. Detailed designs appear for common conditions, such as securing telecommuter connections and tighten security at the corporate campus.