How CRC is Calculated in Ethernet Frame?

Answer: CRC (Cyclic Redundancy Check) is essential to ensuring error-free data transmission across networks. It practically functions as a safety check to make sure the data you transmit gets back to us precisely as you meant.

Steps to CRC Calculation in Ethernet Frame

1. Getting Set to Send: Your computer separates the data into tidy small packets known as “frames” before sending any of it. These frames include some additional information in addition to the actual data you wish to deliver.
2. Securing a Tag Addition: Consider CRC as a security label that is affixed to every frame. A polynomial, a unique kind of mathematical procedure, is used to calculate this tag. Similar to a secret code, only your computer and the recipient can decipher
3. Performing the Math: Your computer uses the polynomial formula to calculate the CRC checksum by iteratively going through each bit of the frame. This procedure makes sure that even a slight alteration to the data will produce an entirely new checksum.
4. Tagging the Frame: After the CRC checksum is computed, it is appended to the frame, often in a designated area set aside for it.
5. Sending it Off: Your computer transmits the packet into the Ethernet network, certain that it is secure, because it has the CRC attached.
6. Verification twice: The receiving machine runs the identical CRC computation after receiving the frame. It knows the data arrived successfully if the checksum it computes matches the one supplied with the frame. However, if there’s even a little mistake, the receiving computer may ask for the frame to be resent if the checksums don’t match.