The User Datagram Protocol (UDP) operates in a connectionless fashion; that is, it provides the same unreliable, datagram delivery service as IP. Unlike TCP, UDP does not send SYN/ACK bits to assure delivery and reliability of transmissions. Moreover, UDP does not include flow control or error recovery functionality. Consequently, UDP messages can be lost, duplicated, or arrive in the wrong order. And because UDP contains smaller headers, it expends less network throughput than TCP and so can arrive faster than the receiving station can process them.
UDP is typically utilized where higher-layer protocols provide necessary error recovery and flow control. Popular server daemons that employ UDP include Network File System (NFS), Simple Network Management Protocol (SNMP), Trivial File Transfer Protocol (TFTP), and Domain Name System (DNS), to name a few.
Tags: User Datagram Protocol
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