Application Layer – 7th Layer in OSI Model Summary of Contents Toggle What is Application Layer in the OSI Model?What is the Function of the Application Layer?What is the Unit of Data Encapsulation in Application Layer?What are the Protocols used at Application Layer? What is Application Layer in the OSI Model? What is the Function of the Application Layer? What is the Unit of Data Encapsulation in Application Layer? What are the Protocols used at Application Layer?