Data networking is a critical area of focus in the study of information security. This paper focuses on reviewing a key area of data networking theory - The Open Systems Interconnect (OSI) Seven Layer Network Model. This paper demonstrates the application of the model's concepts into the context of information security. This paper overall presents the perspective that common information security problems map directly to the logical constructs presented in the OSI Seven Layer Network Model, and seeks to demonstrate the Seven Layer Model's usefulness in evaluating information security problems and solutions. The OSI Model is presented by way of both formal definition and practical terms that affect information security on a layer-by-layer basis. For each layer, examples of common information security threats and controls are evaluated by how they fit into the OSI Seven Layer Model's layers of classification, with notes on exceptions and special cases.
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