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[Acronym] for __U__ser __D__ata __P__rotocol. See UserDatagramProtocol Basically multiuser [IP], over the top of [IP] it adds the concepts of "ports". [UDP] is an unreliable service, packets may arrive out of order, not at all, or, in some cases corrupted[1]. |00|01|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29|30|31 ||||||||||||||||||||||||||||||||^ [IPv4] / [IPv6] Header with protocol 0x11 (17) ||||||||||||||||Source Port||||||||||||||||Destination Port ||||||||||||||||Length||||||||||||||||Checksum ||||||||||||||||||||||||||||||||v Payload ---- [1]: Yes, only if you disable the checksums, but some people do this per host, so you can't rely on it being set on your machine. Sigh. ---- CategoryProtocols
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