security design
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Information technology (IT) and enterprise networks have become the core of many organizations. Critical business functions often depend on a fully functioning IT infrastructure: no network means no ability to generate revenue. To this end, an organization's growth and evolution should be reflected in the growth and evolution of its network. Organizational changes can include new or expanded missions, new factors such as mobile workers, and growth or downsizing in response to purely external factors. Infrastructure changes that stem from these factors can include additional network components (of a type already present), new types of components, and additional subnets or Internet connections. This paper describes the fundamental components of infrastructure design, provides an overview of risk management concepts, and illustrates samples of network topologies. Background A brief discussion of some common network entities will lay the groundwork for later discussion. 1. Servers Servers are probably the most visible network systems. Most peopleeven non-techiesare familiar with the concept of a web server if nothing else...