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A frame check sequence (FCS) is an error-detecting code added to a frame in a communications protocol. In computer networking, an Ethernet frame is a data link layer protocol data unit and uses the underlying Ethernet physical layer transport mechanisms. "What is a Frame Check Sequence or FCS? In this microlearning IT training video , we learn. The FCS field is the only field present in the Ethernet trailer. A first-level check on the quality of the received frame is performed at the receiver by calculating the Ethernet FCS checksum. Frame check sequence (FCS) refers to the extra bits and characters added to data packets for error detection and control.