Which statement best describes UDP compared to TCP?

• A. Connection-oriented and reliable
• B. Ordered delivery with congestion control
• C. Connectionless, unreliable, and unordered
• D. Includes built-in flow control

Answer: (C)

UDP is a simple, fast transport option that does not establish a connection, does not guarantee delivery, and does not preserve packet order. It sends datagrams with minimal overhead, so latency is low and the protocol is lightweight. Because of that, the statement that best describes UDP is that it is connectionless, unreliable, and unordered.

There is no built-in flow control or congestion control in UDP; those features exist in TCP, which manages a connection, ensures reliability through acknowledgments and retransmissions, and preserves order with sequencing. The other descriptions imply guarantees UDP does not provide: connection-oriented or reliable delivery, guaranteed ordered delivery with congestion control, or built-in flow control.