Which switching method duplicates the first six bytes of a frame before making a switching decision?

Question:
Which switching method duplicates the first six bytes of a frame before making a switching decision?

• fragment-free switching
• store-and-forward switching
• cut-through switching
• ASIC switching

Explanation: In cut-through switching, the switch copies into its memory only the destination MAC address (first six bytes of the frame) of the frame. After processing these first six bytes, the switch had enough information to make a forwarding decision and move the frame to the appropriate switchport. This switching method is faster than store-and-forward switching method.

In store-and-forward switching, the switch copies each complete Ethernet frame into the switch memory and computes a Cyclic Redundancy Check (CRC) for errors. If a CRC error is found, the Ethernet frame is dropped. If no CRC error is found then that frame is forwarded.

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