In TCP which layer is not present
In TCP session layer is not present.
The transport protocols include TCP and User Datagram Protocol (UDP), which is sometimes used instead of TCP for special purposes.
Session layer:-
The session layer provides the mechanism for opening, closing and managing a session between end-user application processes, i.e., a semi-permanent dialogue. Communication sessions consist of requests and responses that occur between applications.
TCP:-
Transmission control protocol (TCP) is a set of networking protocols that allows two or more computers to communicate.