Final answer:
The CRC is an error-checking code used in network frames to detect errors during transmission. It is calculated and appended to the frame by the network adapter hardware. On the receiving end, the CRC is recalculated and compared to the appended value to determine if errors occurred.
Step-by-step explanation:
The CRC (Cyclic Redundancy Check) is a type of error-checking code that is used in network frames to detect errors during transmission. It is a checksum that is calculated based on the data in the frame and appended to the frame as an additional field. When the frame is received, the CRC is recalculated and compared with the appended value. If the recalculated CRC does not match the appended value, it indicates that errors were introduced during transmission.
The CRC originates within the network adapter hardware. The network adapter calculates the CRC for outgoing frames by applying a mathematical algorithm to the data in the frame. The result is then added to the frame as the CRC field. On the receiving end, the network adapter recalculates the CRC for incoming frames and compares it to the CRC field. If the two values differ, it means that errors have occurred in the frame.