Final answer:
TCP and UDP protocols are part of the Transport layer of the OSI model, which is responsible for reliable communication, error checking, and flow control with TCP ensuring reliability and UDP focusing on speed.
Step-by-step explanation:
The Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) are both found in the Transport layer of the Open Systems Interconnection (OSI) model. The Transport layer, which is the fourth layer in this model, is responsible for providing communication services directly to the application processes running on different hosts. The main functions of the Transport layer, including TCP and UDP, involve end-to-end communication, error checking, fragmentation and reassembly, and flow control.
TCP is known for being a connection-oriented protocol ensuring reliable communication with error checking and correction, while UDP is a connectionless protocol which offers a quicker but less reliable service without error checking, aimed at applications where speed is more critical than accuracy.