Which applications require TCP and why? Also specify which applications require UDP and why?
A4) TCP is also known as connection-oriented: setup required between client and server processes, reliable transport between sending and receiving process, flow control, congestion control, does not provide timing, minimum throughput guarantees, and security.
UDP Connection-less, unreliable data transfer between sending and receiving process, does not provide connection setup, reliability, flow control, congestion control, timing, throughput guarantee, or security— low overhead. Applications that require TCP are: email, Remote terminal access, web, file transfer, whereas UDP is required by: streaming multimedia, internet telephony.