27. Delimiting and synchronization of data exchange is provided by __
a) Application layer
b) Session layer
c) Transport layer
d) Link layer
Explanation: The session layer provides the mechanism for opening, closing and managing a session between end-user application processes. The session layer 5 is responsible for establishing managing synchronizing and terminating sessions. In TCP/IP protocol stack, the functions of the session layer are handled by the transport layer itself and thus the session layer is missing from the TCP/IP model.