Question

In OSI model, session layer is sandwich between
1) Transport and Data Link layer
2) Application and Presentation layer
3) Presentation and Transport
4) Physical and Network

Answer 1

the seven-layer OSI model of computer networking, the session layer is layer 5. ... If a connection is not used for a long period, the session-layer protocol may close it and re-open it. It provides for either full duplex or half-duplex operation and provides synchronization points in the stream of exchanged messages.