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FOR THE 802.3 FRAME CONTAINS Ethernet Header = 18 Bytes [Dst Mac(6) + Src Mac(6) + Length (2) +CRC(4)]

Minimum Data Portion = 46 Bytes

Minimum Ethernet Frame Size = 64 Bytes Frames must be at least 64 bytes long, not including the preamble, so, if the data field is shorter than 46 bytes, it must be compensated by the Padfield. The reason for specifying a minimum length lies with the collision-detect mechanism. In CSMA/CD a station must never be allowed to believe it has transmitted a frame successfully if that frame has, in fact, experienced a collision. In the worst case it takes twice the maximum propagation delay across the network before a station can be sure that a transmission has been successful. If a station sends a really short frame, it may actually finish sending and release the Ether without realising that a collision has occurred. THATS WHY IT IS MINIMUM 64 BYTES

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Q: Why 64 bytes minimum in ieee 802.3?
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