"Network standard that does not check for errors, and as a result, has less overhead and is faster than a connection-oriented protocol such as TCP. With UDP, the quality of the transmission is sacrificed for speed." (Linda Volonino & Efraim Turban, "Information Technology for Management 8th Ed", 2011)
"A core protocol of the Internet Protocol suite. UDP is a connectionless protocol, which provides no guarantee of delivery." (Weiss, "Auditing IT Infrastructures for Compliance" 2nd Ed., 2015)
"Connectionless, unreliable transport layer protocol, which is considered a 'best effort' protocol." (Adam Gordon, "Official (ISC)2 Guide to the CISSP CBK" 4th Ed., 2015)
"An unreliable network protocol that is fast and efficient in which data is transmitted once to a recipient, but the transmitter is not guaranteed delivery." (O Sami Saydjari, "Engineering Trustworthy Systems: Get Cybersecurity Design Right the First Time", 2018)
"A connectionless unreliable protocol. UDP describes a network data connection based on datagrams with little packet control." (Daniel Leuck et al, "Learning Java" 5th Ed., 2020)
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