What is the purpose of the Frame Check Sequence (FCS) in Ethernet frames?

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Multiple Choice

What is the purpose of the Frame Check Sequence (FCS) in Ethernet frames?

Explanation:
The FCS is about detecting errors that may have happened to a frame during transmission. In Ethernet, a CRC-32 value is added at the end of the frame as the FCS. The sender computes this CRC from the frame’s header and payload (padding if needed) and attaches it. When the frame arrives, the receiver recalculates the CRC over the received data (excluding the FCS) and compares it to the FCS. If they match, the frame is considered error-free; if they don’t, the frame is discarded to avoid delivering corrupted data. The FCS is a robust error-detection mechanism, but it doesn’t provide flow control, encryption, or addressing—those functions come from other parts of the Ethernet system.

The FCS is about detecting errors that may have happened to a frame during transmission. In Ethernet, a CRC-32 value is added at the end of the frame as the FCS. The sender computes this CRC from the frame’s header and payload (padding if needed) and attaches it. When the frame arrives, the receiver recalculates the CRC over the received data (excluding the FCS) and compares it to the FCS. If they match, the frame is considered error-free; if they don’t, the frame is discarded to avoid delivering corrupted data. The FCS is a robust error-detection mechanism, but it doesn’t provide flow control, encryption, or addressing—those functions come from other parts of the Ethernet system.

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