What is the differences between Fast Ethernet port and Gigabit Ethernet port?

The Fast Ethernet port can transmit 10 and 100 Mbps. While the Gigabit Ethernet port can transmit 10, 100 and 1000 Mbps.

When a Fast Ethernet device connects with a Gigabit Ethernet device, the transmit speed will compromise to 100 Mbps.

If you are using a PC/server with the Gigabit Ethernet port, it is recommended to select an MG400, which has Gigabit Ethernet port so that you can maintain 1000 Mbps speed.