# OSI Model The OSI Model is a layered protocol model. It was proposed by the International Organization for Standardization. ![[OSI-model.png]] The model can be used as a reference to understand how networks operate. The model was created to have a sta As you can see the model has 7 layers. Each layer has their own responsibility. ## Physical Layer ## Data Link Layer ## Network Layer ## Transport Layer ## Session Layer ## Presentation Layer ## Application Layer