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This article addresses the primary threats to computer networks that a small business might encounter and also provides strategies to counter these threats. It emphasizes the key characteristics associated with each category of security threat and provides approaches to eliminate or alleviate these threats. The article also presents a case study of a small insurance company for which the authors helped design, implement and secure computer networks. This case study further clarifies the concepts and strategies presented in the paper. This article should be particularly informative and helpful to businesses where a non-technical professional or an IT professional with inadequate background in network computing is responsible for administrating computer networks, an environment that is quite prevalent among small businesses.