What are the key differences between the OSI and the TCP/IP reference models?

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"There are several fundamental differences between the OSI and TCP/IP reference models. The first is a seven-layer architecture, while the second only has four layers. OSI is well defined with fixed boundaries between the layers. The TCP/IP model is more flexible, with no strict boundaries between each layer. TCP/IP was developed to create more reliability and improve the low reliability of the OSI model. Finally, the OSI model is a vertical layer approach while the TCP/IP model is horizontal."