Explain the differences between connection-oriented and connectionless session establishment, and discuss the advantages and disadvantages of each approach.

In connection-oriented session establishment, a logical connection is established between communicating entities before data transfer begins. This approach ensures reliable data delivery and sequencing but requires more overhead for connection setup and maintenance. In contrast, connectionless session establishment does not establish a dedicated connection before data transfer, leading to lower overhead but potentially less reliable data delivery and sequencing. The advantage of connection-oriented communication is its reliability, while the advantage of connectionless communication is its efficiency.