Switch A does not have the MAC address of Router Y and will therefore flood the frame out its ports.
Cut-through switches do not perform any error checking of the frame because the switch looks only for the frame's destination MAC address and forwards the frame out the appropriate switch port.
At 9:59 Wednesday morning, Mr. Burress unfolded his 6-foot-5 frame out of a black Lexus sedan and took a few long strides into One Hogan Place, the office of the district attorney.
