The User Datagram Protocol (UDP) is also a core member of the internet protocol suite. Like TCP, it operates on layer 4 of the OSI model that is responsible for delivering data segments between the application and the IP layer. Unlike TCP, the header is only 64-bit, which only consists of a source and destination port, length, and checksum. The lightweight header makes it ideal for applications that prefer faster data delivery without setting up the session between two hosts or needing reliable data delivery. Perhaps it is hard to imagine with today's fast internet connections, but the extra header made a big difference to the speed of transmission in the early days of X.21 and frame relay links. Although, as important ...
User datagram protocol
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