Which switching method is responsible for dropping frames that fail the FCS check?

Which switching method is responsible for dropping frames that fail the FCS check?

• A. Cut-through switching
• B. Store-and-forward switching
• C. Fragment-free switching
• D. Virtual circuit switching

Answer: (B)

Store-and-forward switching is the method that is responsible for dropping frames that fail the Frame Check Sequence (FCS) check. In this switching method, the entire frame is received and stored before any decision is made about forwarding it. This allows the switch to examine the frame for errors, including checking the FCS, which verifies the integrity of the data within the frame. If the FCS check indicates that the frame is corrupted, the switch will discard the frame rather than forwarding it to the next device on the network. This capability helps maintain network efficiency and reliability by preventing corrupted data from traveling through the network. The other methods do not have the same error-checking mechanism. For instance, cut-through switching begins forwarding frames as soon as the destination address is recognized, potentially allowing corrupted frames to be sent through the network. Fragment-free switching offers a compromise between the two by waiting until the first 64 bytes of the frame are received, but it does not perform a complete FCS check. Virtual circuit switching is a method used in connection-oriented networking that does not relate directly to how error-checking on frames is managed.

Store-and-forward switching is the method that is responsible for dropping frames that fail the Frame Check Sequence (FCS) check. In this switching method, the entire frame is received and stored before any decision is made about forwarding it. This allows the switch to examine the frame for errors, including checking the FCS, which verifies the integrity of the data within the frame.

If the FCS check indicates that the frame is corrupted, the switch will discard the frame rather than forwarding it to the next device on the network. This capability helps maintain network efficiency and reliability by preventing corrupted data from traveling through the network.

The other methods do not have the same error-checking mechanism. For instance, cut-through switching begins forwarding frames as soon as the destination address is recognized, potentially allowing corrupted frames to be sent through the network. Fragment-free switching offers a compromise between the two by waiting until the first 64 bytes of the frame are received, but it does not perform a complete FCS check. Virtual circuit switching is a method used in connection-oriented networking that does not relate directly to how error-checking on frames is managed.