A receiving host computes the checksum on a frame and determines that the frame is damaged. The frame is then discarded. At which OSI layer did this happen?
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A. B. C. D. E.C
Operations on frames occur at the data link layer.
The correct answer is C. data link.
Explanation: The data link layer of the OSI model is responsible for error detection and correction within a single physical network segment. It is at this layer that the checksum is calculated and verified to detect errors in data transmission.
When a receiving host computes the checksum on a frame and determines that the frame is damaged, it means that the checksum has failed and the data link layer has detected an error in the transmission. The data link layer then discards the frame to prevent it from being passed up to higher layers of the OSI model, as the error cannot be corrected by those layers.
The physical layer (option A) is responsible for transmitting bits over a physical medium and does not perform any error detection or correction.
The session layer (option B) is responsible for establishing, managing, and terminating sessions between applications and does not handle error detection or correction.
The transport layer (option D) is responsible for end-to-end data delivery, flow control, and error recovery, but checksum is not a function of the transport layer.
The network layer (option E) is responsible for logical addressing, routing, and fragmentation of packets, and does not handle error detection or correction.