Session Layer

The Session Layer (layer 5) is the next layer in the OSI model. This layer is responsible for providing presentation layer protocols with a means to organize and synchronize their communication. This layer allows protocols above it to establish session connections, to exchange data in an orderly fashion, and to finally tear down or release the connection. Additionally, this layer may provide other services such as exception handling services (generating error dialogues when problems occur with the connection). An example of a protocol that exists at this layer is the X.215 protocol (the session service).