The working principle of the network switch |
| Author： Date：2016/8/31 15:35:49 |
The most widely in accordance with the common classification methods, LAN switches can be divided into Desktop switches (Desktop Switch), Workgroup switches (Workgroup Switch) and Campus network switches (Campus Switch) three categories. Desktop switches is one of the most common kind of switches, the most widely used, especially in the general office, small rooms and business acceptance of business units, multimedia production, web site management center and other departments. On the transmission speed, most modern desktop switches provide multiple port with 10/100 m adaptive ability. Type workgroup switches are commonly used to as expansion of equipment, cannot satisfy the demand in the desktop switches, most directly considers the switch of the working group. Although type workgroup switches only less number of ports, but support more MAC address, and it has good expansion ability, port of transmission speed basically is 100 m. The application of campus network switches is relatively small, applies only to large networks, and generally as the backbone of the network switch, and a fast data exchange ability and the ability to full duplex, provide fault tolerance and other intelligence features, also support the expansion of options and layer 3 switching virtual local area network (VLAN) and other functions.
According to the exchange of technology, and put into port switch, frame and cell switch 3 kinds. Switches with bridge, port forwarding delay is small, the operating performance close to a single LAN, far more than the ordinary bridge between Internet forwarding performance. Port switching technology first appeared in the hub of slot type, such as a hub of lagging usually have multiple Ethernet segments, divided into no Bridges or routers connected, is without feeling between networks. The etheric main module are usually assigned to a backboard after insert on a network segment. Exchange for port port on the back of the etheric module allocated, balance between multiple network segments. Frame switching is currently the most widely used LAN switching technology, it through to the traditional transmission medium for differential, provide parallel transfer mechanism, to reduce the collision domain and obtain high bandwidth. ATM technology represents many of the problems in the network and communication a dose of "good medicine". |