(6pt) A switch is a smart device that can divide a LAN into several LAN segments (collision domains) and automatically learn where to forward frames. Consider the following Ethernet LAN. Suppose that at beginning, all the switches have no entry stored in their switch tables. Then, host A sends a frame to host G, and host G replies a frame to host A. (Other hosts do not send out frames.) What is the total number of frames (original and copies) that traverse over the entire LAN until host A receives the reply from host G?