Topology this noun borrowed from geometry. Network topology is network shapes, or is it in physical connectivity. Constitute the topology of the network has a lot of kinds. Network topology structure refers to various equipment with transmission media interconnection of physical layout, is in what manner put the computer on the network equipment joined up. Situs given network server and workstations network configuration and mutual connection, its structure is mainly have star structure, the annular structure, bus structure, distributed structure, tree structure, mesh structure, cellular structure, etc.
Star topology structure
Star structure is one of the oldest connection mode, everybody everyday usage of telephone belongs to this structure. Star structure is to point to each workstations to star way connected into the nets. The network has a central node, other nodes (workstation, server) are directly connected with the central node, the structure with the central node is the center, so called star topology structure is one of the oldest connection mode, everybody everyday usage of telephone belongs to this structure. Star structure is to point to each workstations to star way connected into the nets. The network has a central node, other nodes (workstation, server) are directly connected with the central node, the structure with the central node is the center, so called centralized network. Star topology structure facilitates concentration control, because the communication between the end users must pass formulates. Because this one characteristic, also brought easy maintenance and safety, etc. End users equipment for failure when stop also will not affect the other end users communications. Meanwhile star topology of network delay time is lesser, transmission error is relatively low. But this kind of structure is very adverse point is the center system must have high reliability, because center system once damaged, the whole system tends paralysis. This center system usually adopt dual machine thermal back-up, in order to improve the system reliability.
