Answer:
Frame check sequence (FCS) refers to the extra bits and characters added to data packets for error detection and control.
Step-by-step explanation:
Network data is transmitted in frames. Each frame is comprised of bits of data appended to the header, which holds basic information such as source and destination media access control (MAC) addresses and application. Another set of characters is added to the end of the frames, which are checked at the destination. Matching FCSs indicate that delivered data is correct.