Application Layer — Layer 7

Open image in new window We have now arrived at the highest layer of the OSI model, where the model and the world of application processes meet and interact. This layer is different from all the other layers in that it does not have a strictly defined interface with a higher layer: instead, the Application Layer and application processes overlap. The application process consists of two parts, one which performs processing outside the OSI environment and one which resides within the Application Layer.