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CISA® Certified Information Systems Auditor®: Study Guide, Third Edition by David Cannon

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Introducing the Open Systems Interconnect Model

In the early 1980s, the International Organization for Standardization (ISO) was busy creating a new data communications model. Its intention was to build the next generation of communications protocols to replace both proprietary protocols and the de facto TCP/IP. In the end, the cheaper TCP/IP won the battle.

Many customers had no interest in paying for the cost of developing the Open Systems Interconnect (OSI) protocol. The OSI model is still used as a training tool. As an auditor, you need to recognize that the OSI model is designed to facilitate separation of duties (SoD). This model stratifies data communication into seven distinct layers. Each layer provides a unique function in support of ...

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