CRC (Cyclic Redundancy Check) is used for:

When a device sends data over a network, it adds a special value (called a CRC code) to the end of the frame. This value is calculated based on the contents of the frame. When the receiving device gets the frame, it performs the same calculation. If the result does not match the received CRC code, it means there was an error during transmission.

Key points about CRC:

• It helps detect errors caused by noise or signal issues during transmission.


• It does not correct the error, but it alerts the system that the data is faulty.


• CRC is commonly used in Ethernet and many other communication protocols.

This process ensures that only correct and complete data is processed, improving the reliability of communication between devices.

Conclusion: CRC is a powerful method for detecting errors in frames at the Data Link Layer. It helps maintain data integrity and is widely used in network communications.