Which protocol uses a Frame Check Sequence to verify integrity?

The correct response is that Ethernet utilizes a Frame Check Sequence (FCS) to verify the integrity of the data being transmitted. In telecommunications and computer networking, the FCS is a method for detecting errors in frames transmitted over a network. It works by generating a checksum value that is appended to the end of the frame. When the frame reaches its destination, the receiving device computes the checksum value again and compares it with the value sent in the FCS. If both values match, it indicates that the data has likely remained intact during transmission; if they do not match, it suggests an error occurred, prompting the need for re-transmission or other error handling processes.

In contrast, while TCP and UDP are protocols that ensure data delivery and might involve error detection and correction, they do not specifically rely on FCS. Instead, TCP employs checksums to provide a similar form of integrity verification on segments, while UDP also uses checksums but without the same comprehensive error-handling capabilities that TCP has. ICMP operates as a network layer protocol primarily used for sending messages and managing network communication, and it does not utilize an FCS to check the integrity of its messages like Ethernet does. Therefore, the focus on FCS within the Ethernet framework highlights its role