One-key to change network mode: 1.Standard: All ports can communicate with each other. It can be used as a common non-management PoE switch. 2.Priority: Ports 1 to 8 are high-priority ports, which greatly reduce packet loss and congestion when the network is congested. 3.Extend: The maximum transmission distance of the 9-16 ports of the switch can reach 250 meters, and all ports can communicate with each other. 4.VLAN: Ports 1 to 16 cannot communicate with each other, but can communicate with ports 17, 18, SFP1 (19), and SFP2 (20), which can be used to isolate broadcast storms and DHCP conflicts.