What is a Layer 2 switch? How to divide the second floor of 1

Layer 1 switch: Only physical layer protocols are supported.

Layer 2 switch: supports physical layer and data link layer protocols.

Layer 3 switch: supports physical layer, data link layer and network layer protocols.

That is to say, layer 2 switches mainly performs the functions of Layer 2 data link layer (but also participates in the realization of physical layer functions, namely Layer 1 switch), so it is called layer 2 switches.

For example, a hub is a layer of equipment because it only performs the functions of the physical layer.

According to the hierarchical structure of ISO/OSI, switches can be divided into layer 2 switches and three-layer switches. There is no so-called layer 1 switch.

Layer 2 switches (Layer 2 Switches) refers to a traditional switch working in the second layer of OSI reference model-data link layer. Its main functions include physical addressing, error checking, frame sequence and flow control.

A three-layer switch is a device with a three-layer switching function, that is, a layer 2 switches with a three-layer routing function, but it is an organic combination of the two, and it is not simply to superimpose the hardware and software of the router device on the lan switches.