Which of the following is a connection oriented transport layer protocol?

TCP (Transmission Control Protocol) is a connection-oriented protocol at the transport layer, meaning it establishes a formal connection before data transmission, guarantees delivery of data packets, ensures ordered packet delivery, and handles error checking and retransmission. This ensures reliable communication between applications.

UDP (User Datagram Protocol) is a connectionless transport layer protocol; it does not establish a connection, guarantee delivery, or ensure packet order.

TFTP (Trivial File Transfer Protocol) is an application layer protocol that uses UDP for its transport and is connectionless, not a transport layer protocol itself.

SNMP (Simple Network Management Protocol) is an application layer protocol used for network device management and typically uses UDP as its transport, making it connectionless at the transport layer.