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The Start Frame Delimiter (SFD) in an Ethernet frame is a specific sequence of bits that indicates the start of the actual data frame. It consists of the 8-bit value 0xD5 (in hexadecimal), which is represented in binary as 10101011. The SFD follows the preamble, which is a sequence of 7 bytes (56 bits) used for synchronization. The purpose of the SFD is to signal to the receiving device that the incoming data frame is about to start, helping it distinguish the beginning of the frame from the noise that might be present on the network.