• Finer application-level control over what data is sent, and when. Under UDP, as
soon as an application process passes data to UDP, UDP will package the data
inside a UDP segment and immediately pass the segment to the network layer.
TCP, on the other hand, has a congestion-control mechanism that throttles the
transport-layer TCP sender when one or more links between the source and destination hosts become excessively congested. TCP will also continue to resend a
segment until the receipt of the segment has been acknowledged by the destination, regardless of how long reliable delivery takes. Since real-time applications
often require a minimum sending rate, do not want to overly delay segment
transmission, and can tolerate some data loss, TCP’s service model is not particularly well matched to these applications’ needs. As discussed below, these applications can use UDP and implement, as part of the application, any additional
functionality that is needed beyond UDP’s no-frills segment-delivery service.
• Finer application-level control over what data is sent, and when. Under UDP, as soon as an application process passes data to UDP, UDP will package the data inside a UDP segment and immediately pass the segment to the network layer. TCP, on the other hand, has a congestion-control mechanism that throttles the transport-layer TCP sender when one or more links between the source and destination hosts become excessively congested. TCP will also continue to resend a segment until the receipt of the segment has been acknowledged by the destination, regardless of how long reliable delivery takes. Since real-time applications often require a minimum sending rate, do not want to overly delay segment transmission, and can tolerate some data loss, TCP’s service model is not particularly well matched to these applications’ needs. As discussed below, these applications can use UDP and implement, as part of the application, any additional functionality that is needed beyond UDP’s no-frills segment-delivery service.
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