Which OSI Layer Discards Damaged Frames?

D

The OSI model is a reference model that describes how information moves between devices on a network. It is divided into seven layers, each with a specific role in the process.

In this scenario, the receiving host has detected that the frame is damaged and has discarded it. This indicates that an error occurred at one of the lower layers of the OSI model.

The checksum is typically calculated at the data link layer, which is layer 2 of the OSI model. This layer is responsible for transferring data between adjacent network devices and providing error detection and correction. The checksum is a value that is calculated based on the contents of the frame, and it is used to detect errors that may have occurred during transmission.

If the receiving host determines that the checksum is incorrect, it means that the frame has been corrupted during transmission, likely due to noise or interference on the network. Since the error occurred at the data link layer, the frame is discarded at that layer and is not passed up to the higher layers of the OSI model.

Therefore, the answer to the question is D. data link layer.