What is the name given to layer 4 of the Open Systems Interconnection (ISO) model?

The name given to layer 4 of the Open Systems Interconnection (OSI) model is Transport. This layer is responsible for end-to-end communication and ensures reliable, error-free data transfer between nodes on a network. It establishes a connection, segments the data into smaller units, and manages flow control, error recovery, and retransmission of lost or damaged packets. The Transport layer acts as a bridge between the lower layers that handle physical and logical addressing, and the upper layers that deal with application-specific protocols and data.