The OSI Model

The Open Systems Interconnect (OSI) model is a concept model that makes understanding network connectivity and communications easy. It also serves to create standards for network devices and hardware. Discuss the benefits of the OSI model for the Network Administrator of today. What other network models exist and discuss why they are not as popular as the OSI  model. Finally list 2 devices (hardware, software, application or similar entity) that is implemented in each layer of the OSI model.