What is the bit pattern of one byte in the Ethernet preamble?

The Ethernet preamble consists of a specific bit pattern that is used for synchronization between the sender and the receiver. The correct answer, which is 10101010, is significant because this pattern is repeated 7 times in the preamble, creating a sequence of 56 bits followed by 1 byte of Start Frame Delimiter (SFD) represented by the bit pattern 10101011.

The preamble's alternating 1s and 0s (10101010) allow the devices on the network to detect the beginning of the Ethernet frame and synchronize their clocks accordingly. This ensures that the data can be interpreted correctly as it arrives over the Ethernet medium.

In contrast, the other answer choices do not represent the standardized bit pattern utilized in Ethernet preambles. Therefore, the choice of 10101010 not only aligns with the technical requirements of Ethernet but also helps devices establish communication effectively by allowing them to recognize incoming frames correctly.