Which protocol is commonly used to send small, unreliable messages in a TCP/IP context?

Which protocol is commonly used to send small, unreliable messages in a TCP/IP context?

• A. User Datagram Protocol (UDP)
• B. Transmission Control Protocol (TCP)
• C. Internet Protocol (IP)
• D. Simple Mail Transfer Protocol (SMTP)

Answer: (A)

Small, unreliable messages are best handled by User Datagram Protocol. UDP is a connectionless transport protocol that sends datagrams with minimal overhead and does not guarantee delivery, order, or error recovery. That trade-off makes it ideal for quick, simple messages where speed is more important than reliability, such as lightweight queries or real-time data. In contrast, TCP provides reliable, ordered delivery with retransmission and more overhead; IP handles addressing and routing but doesn’t provide transport-layer reliability; and SMTP is an application-layer protocol for email that typically runs over TCP. So UDP’s low overhead and lack of delivery guarantees match the described use case.

Small, unreliable messages are best handled by User Datagram Protocol. UDP is a connectionless transport protocol that sends datagrams with minimal overhead and does not guarantee delivery, order, or error recovery. That trade-off makes it ideal for quick, simple messages where speed is more important than reliability, such as lightweight queries or real-time data. In contrast, TCP provides reliable, ordered delivery with retransmission and more overhead; IP handles addressing and routing but doesn’t provide transport-layer reliability; and SMTP is an application-layer protocol for email that typically runs over TCP. So UDP’s low overhead and lack of delivery guarantees match the described use case.