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CRC or Cyclic Redundancy Check is an error control method used in Ethernet where a checksum is computed and appended to the data frame being sent across the channel

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CRC or Cyclic Redundancy Check is an error control method used in Ethernet where a checksum is computed and appended to the data frame being sent across the channel.Please explain briefly why the CRC is put in the trailer rather than in the header of the frame?