(In this experiment, an S2126G switch is used as an example, and the switch is named SwitchA. Assume that PC1 is connected to port 0/5 of the switch through a network cable, the IP address and netmask are 192.168.0.5, 255.255.255.0, and PC2 is connected to port 0/15 of the switch through a network cable, and the IP address and netmask are 192.168 .0.15, 255.255.255.0, other, PC1 is connected to the control (Console) end of the switch through the serial port (Com))