Discussion
Which one of the following does not support User Datagram Protocol?
Answer: D
The answer is Reliability.
UDP is a connectionless transport protocol. It sends datagrams without setting up a connection, without acknowledgements and without retransmission, so it does not provide reliable delivery; applications that need reliability must add it themselves or use TCP.
The other three are applications that commonly run over UDP: the Network File System (in its traditional versions), the Domain Name System for ordinary queries, and the Simple Network Management Protocol.
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