Network Components and terms
Hub is a device for connection multiple ethernet devices together and making then act as a single network segment.
Bridges Bridge is a device which filter data traffic at a network. Bridges reduce the amount of traffic on a LAN by dividing it into two segments.
Switches Switch used in a network to connect Ethernet cables from a number of devices together.
On-line On-line is the condition of being connected to a network of computers or other devices.
Off-line is the condition of being capable of but currently not connected to a network computer or other devices.