Abstract: A network device including a power receiving socket, a power supply, a network controller, plural connection ports and a power outputting socket is provided. The power receiving socket is for receiving an external power and outputting a supply power. The power supply is electrically connected with the power receiving socket for receiving the supply power, wherein the power supply has the received supply power rectified and voltage-reduced, then outputs a direct current power. The network controller operates according to direct current power. The plural connection ports respectively are respectively electrically connected with the network controller. The power outputting sockets is electrically connected with the power receiving socket for receiving and outputting the supply power.

Abstract: A network device including a power receiving socket, a power supply, a network controller, plural connection ports and a power outputting socket is provided. The power receiving socket is for receiving an external power and outputting a supply power. The power supply is electrically connected with the power receiving socket for receiving the supply power, wherein the power supply has the received supply power rectified and voltage-reduced, then outputs a direct current power. The network controller operates according to direct current power. The plural connection ports respectively are respectively electrically connected with the network controller. The power outputting sockets is electrically connected with the power receiving socket for receiving and outputting the supply power.

Abstract: A method for locating the incoming port of a MAC address is proposed. First, a forwarding table of each switch is retrieved. Then, a list of at least one MAC address owned by each switch is retrieved. Next, a port table of each switch is established. The MAC addresses in the forwarding table are compared with the MAC addresses owned by all switches. If one of the MAC addresses owned by switches matches the MAC address in the forwarding table, the port property of the corresponding port is changed to an interconnecting port. Finally, the target MAC address is compared with the MAC addresses in the forwarding table. If one of the MAC addresses in the forwarding table matches the target MAC address, and the port property of the corresponding port is end port, this port is the incoming port of the target MAC address.