Final answer:
The CRC in a network frame is found in the End-of-frame field, and it serves as an error-detection mechanism to check data integrity.
Step-by-step explanation:
The CRC, or Cyclic Redundancy Check, is a common technique used to detect errors in digital data. In the context of a network frame, which is a unit of data used to transmit information over a network, the CRC is typically found in the End-of-frame field. The CRC is generated by the sending device, which applies a specified polynomial division to the entire frame, excluding the CRC itself. This result, the remainder of the division, is then appended to the end of the frame before it is transmitted. Upon receiving the frame, the receiving device performs the same polynomial division and compares the resulting remainder with the received CRC value. A mismatch indicates that an error has occurred during transmission.
In summary, the CRC originates in the End-of-frame field of a network frame, where it serves as an error-checking mechanism to ensure data integrity during transmission.