Multiple choice Transport layer of TCP/IP model comprises _______ and _______ protocols. TELNET; SMTP TCP; IP TCP; UDP IP; UDP TCP; TELNET Reveal answer Fill a bubble to check yourself C Correct answer Explanation TCP and UDP are parts of transport layer. TCP is a reliable connection oriented protocol that allows a byte stream originating from one machine to be delivered to the other machine without any error. UDP is an unreliable and connectionless protocol.