The OSI Model provides a conceptual framework for communication between computers, but the model itself is not a method of communication. Actual communication is made possible by using communication protocols. Each layer on the OSI Model has some protocols associated with it. Some important protocols on each layer are as in below:
Similar to protocols, each layer has associated equipment with it. For example, Hubs, Repeaters & Media Converters operate at Layer1, L2 Switches & Bridges generally operate on Layer2, Routers & Layer3 Switches operate on Layer3, Firewalls work on Application Layers and some on Transport Layer4 as well.
How to remember Layer Names
In addition to remembering the functions, features, basics, protocols and devices of each OSI layer, we also need to remember the names of the layers. We can simply memorize them but relevant phrases are easy to remember. We can remember them by memorising some interesting phrases as in below:
In these phrases, the first letter of each word is the same as the first letter of an OSI layer name as highlighted in YELLOW in above. So, it becomes very easy to remember these layer names & order.