Which frame forwarding method performs a CRC check to detect errors before forwarding the frame?

The choice of store-and-forward switching is correct because this method involves receiving the entire data frame before it is transmitted to the next hop in the network. When a frame is received, the device performs a Cyclic Redundancy Check (CRC) to verify the integrity of the data within the frame. If the CRC check indicates that the frame is free from errors, the switch then forwards it to the appropriate destination.

This process ensures that only error-free frames are transmitted, which enhances the reliability of data transfer, especially in environments where data integrity is crucial. Unlike other switching methods, such as cut-through switching, which begins forwarding the frame as soon as the destination address is read (without waiting for the entire frame to be received and checked), store-and-forward switching adds a layer of error detection before forwarding the data. This is particularly beneficial in reducing the spread of corrupted frames across the network, making it a preferred choice in certain scenarios.