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what is the maximum and minimum  size of udp datagram ?

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The minimum length is 8 bytes because that is the length of the header. The field size sets a theoretical limit of 65,535 bytes (8 byte header + 65,527 bytes of data) for a UDP datagram. The practical limit for the data length which is imposed by the underlying IPv4 protocol is 65,507 bytes (65,535 − 8 byte UDP header − 20 byte IP Header).

Source:https://en.wikipedia.org/wiki/User_Datagram_Protocol

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