Which switch mode operation reads only the first 64 bytes before making a switching decision?

A. Cut-through mode
B. Fragment-free mode
C. Store-and-forward mode
D. Fast switching

B. Fragment-free mode reads the first 64 bytes and deems the frame intact and forwardable. This is because most collisions that would create frame fragments happen within the first 64 bytes of a frame. This method of switching is often found on SOHO switching equipment.