The Session layer (Layer 5) is in charge of establishing, managing, and terminating the logical dialog between two networked hosts. It sets up a communication session, keeps it active while data flows, and gracefully closes it when the exchange is finished. Tasks such as regulating how much data is sent (flow control) belong to the Transport layer, while defining network routes is a Network layer function. Translating data formats and handling encryption occurs in the Presentation layer.
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