Session Layer (5th).
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Communication sessions are managed at this level (i.e., installation, support, and termination of communication are performed). This layer provides three session setup modes: simplex (data transmission in one direction), half-duplex (data transmission alternately in two directions) and full-duplex (data transmission simultaneously in two directions). The session layer can also insert special control points into the data stream that allow you to control the transmission process when the connection is broken. The same level recognizes the logical names of subscribers and controls the access rights granted to them.




