Layer 5 - Session

Session Layer provides a way to track one more more messages between a client and server. The management between client and server for message management is called a dialog.

Layer 6 - Presentation

Presentation Layer provides a way to encrypt or compress messages between a client and server.

Layer 7 - Application

Application Layer provides a way for systems to interpret the messages over the network via a Network Interface Card (NIC) and transform it in the form of an Email, Web Browsing, Communications, Printing, Database or File Systems.