Abstract: A method of managing port DHCP server protocol addresses is provided, applicable to switch hub. The port DHCP server connects to at least a port and includes port IP address allocation table. When the port try to connect, port DHCP is given priority to receive DHCP discovery message broadcast from port and respond to client. The client can use the default IP address provided by port DHCP server, instead of waiting for floating IP address provided by other DHCP server. When the hardware connected to port is replaced or reset, the hardware automatically obtains default IP address of port. When the port is connected to more than one device with IP, the method allows first device to obtain default IP address of port and other devices automatically obtains floating IP address provided by other DHCP server to shorten waiting time and provide convenient management of each port connection.

Abstract: The present invention relates to a casing assembly of a monitor. The monitor includes a casing, a cover and a connecting arm. The casing has a first end and a second end. The second end has a plurality of fixing portions. The cover is provided with a plurality of fixing elements that correspond to the fixing portions and are fixed to each other. These fixing elements can be operated manually. One end of the connecting arm is rotationally connected with the second end of the casing; and the another end of the connecting arm is fixed to the cover thereon so that the cover can be opened or closed manually without any tools at the second end of the casing, and prevent the cover from falling off or being lost easily.