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Switch 12
Switch 12

'Switch' is a foreign word, derived from the English 'Switch', the original meaning is 'switch', the Chinese technology industry introduced the word, translated as 'exchange.' In English, the verb 'exchange' and the noun 'switch' are the same word (note that 'exchange' here refers specifically to the exchange of signals in telecommunications technology, not the same concept as item exchange).

In 1993, local area network switching equipment appeared. In 1994, there was a boom in switching network technology in China. In fact, switching technology is a switching product with simplified, low-cost, high-performance and high-port-intensive features, which embodies the complex operation of bridging technology in the second layer of the OSI reference model. Like the bridge, the switch forwards the information relatively simply by the MAC address in each packet. This forwarding decision generally does not consider the deeper other information hidden in the package. Unlike the bridge, the switch has a small forwarding delay and operates close to a single LAN performance, far exceeding the forwarding performance between ordinary bridged Internet networks.

Switching technology allows shared and dedicated LAN segments to adjust bandwidth to mitigate bottlenecks in information flow between LANs. There are switching products for Ethernet, Fast Ethernet, FDDI and ATM technologies.

Like traditional bridges, switches offer many networking features. The switch can economically divide the network into small conflicting domains, providing higher bandwidth for each workstation. The transparency of the protocol allows the switch to be installed directly in a multi-protocol network with simple software configuration; the switch uses existing network cables for cables, repeaters, hubs, and workstations, eliminating the need for high-level hardware upgrades; the switch is transparent to the workstation In this way, the management overhead is low, and the operation of adding, moving, and changing network nodes is simplified.

The use of specially designed integrated circuits allows the switch to forward information in parallel at all line rates at line rates, providing much higher operational performance than traditional bridges. ASIC technology enables the switch to achieve this performance with more ports, and its port cost is lower than traditional bridges.

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