HTTP, FTP, SMTP, IMAP, and POP3 are among the most commonly used application protocols. They all run on top of TCP rather than on UDP. Why? What are some examples of applications that run on UDP? What makes them suitable for UDP?
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All the enumerated protocols are connection-oriented; for each of them it takes places a “handshake” between the sender and the receiver (or between the parties implied in the communication process). This is the main reason why they use TCP on different ports. By comparison, UDP is a connectionless transport protocol and can’t provide reliable communication between two systems (e.g. with respect to the guarantee of the delivery or confirmation); this shortcoming could harm to the entire communication process....
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