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Switch 9
Switch 9

With the rapid development of computers and their interconnected technologies (also known as 'network technologies'), Ethernet has become the most popular short-distance two-layer computer network to date. The core component of Ethernet is the Ethernet switch.

Ethernet switch

Whether it is manual switching or program-controlled switching, it is to transmit voice signals, which is a 'circuit switching' that requires exclusive lines. Ethernet is a computer network that needs to transmit data, so it uses 'packet switching.' But no matter which switching method is adopted, the switch will not change the feature of providing 'exclusive access' between two points. In the case of Ethernet devices, the essential difference between a switch and a hub is that when A sends a message to B, if it passes through a hub, all network nodes accessing the hub will receive this message (that is, it is sent by broadcast). Only the NIC will filter out the information that is not sent to the machine at the hardware level; if it passes through the switch, unless A notifies the switch to broadcast, the information C sent to B will never be received (obtaining the control permission of the switch to monitor the situation) except). [3]

Ethernet switch vendors have introduced three or even four-layer switches based on market demand. But in any case, its core function is still the Layer 2 Ethernet packet exchange, but with a certain ability to handle IP layers and even higher layers of data packets. A network switch is a network-enhancing device that provides more ports in a subnet to connect more computers. With the development of the communication industry and the advancement of national economy information, the network switch market has shown a steady upward trend. It is characterized by high performance and price ratio, high flexibility, relatively simple and easy to implement.

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