With the rapid development of computers and their interconnection technology (also known as “network technology”), Ethernet has become the short-range two-layer computer network with the highest penetration rate so far. The core component of Ethernet is the Ethernet switch.
Manual and program-controlled switching are used to transmit voice signals and are “circuit switching” that requires exclusive lines. Ethernet is a computer network that needs to share data, so it adopts “packet switching.” However, no matter which switching mode is adopted, the switch will provide “exclusive access” between two points. As far as Ethernet equipment is concerned, the essential difference between the switch and the hub is that when A sends a message to B, if it passes through the hub, all network nodes accessing the hub will receive the message (that is, it is sent in the form of a broadcast), but the network card will filter out the information not sent to the local machine at the hardware level; If the switch is used, unless A notifies the switch to broadcast, the message sent to B will never be received by C (except for obtaining the switch control permission to monitor).
Ethernet switch manufacturers have introduced layer 3 or even layer 4 switches according to market demand. However, its core function is still the Ethernet packet switching of the second layer, with the ability to handle the IP layer and even higher layer packets. The network switch is a device to expand the network, providing more connection ports for the subnetwork to connect more computers. The market for network switches is on the rise steadily; with the development of the communication industry and the promotion of the informatization of the national economy, the need for network switches is on the rise steadily. It has a high-cost performance ratio and high flexibility, which is relatively simple and easy to implement.
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