無効ＳＰＤＵむこうえすぴーでぃーゆーMeanings1nouninvalid SPDUcomputingTechnical computing term for an SPDU (Session Protocol Data Unit) that fails validation or is not recognized. Used in network protocol contexts.受じゅ信しんした無む効こうＳＰＤＵは破は棄きされます。Received invalid SPDUs are discarded.
