PMP exam practice questions and solutions

Then it lists five layers in the chart with distinct names. Go figure. This "PMI Academy" model most closely corresponds to the four-layer DoD model that PMI has tested on for years. The other model is the OSI model which has seven layers. For testing purposes, know the names of each layer in each model, and, which layer(s) in one model correspond to which layer(s) in the other. As noted, Lammle covers the DoD model in about 30 pages, and the OSI model in about 15. The information is dense, but clear and concise, and flows nicely from layer to layer.

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