What is vlan?

VLAN is Virtual LAN. It is a group of logical devices and users. These devices and users are not restricted by physical location. , they can be organized according to factors such as functions, departments, and applications, and communicate with each other as if they were on the same network segment, hence the name virtual LAN.

VLAN is a relatively new technology that works on layers 2 and 3 of the OSI reference model. A VLAN is a broadcast domain, and communication between VLANs is through the layer 2 and layer 3 of the OSI reference model. This is accomplished by a layer 3 router.

Compared with traditional LAN technology, VLAN technology is more flexible and has the following advantages: The management overhead of moving, adding and modifying network equipment is reduced; broadcast activities can be controlled; and network security can be improved.

In computer networks, a Layer 2 network can be divided into multiple different broadcast domains. One broadcast domain corresponds to a specific user group. By default, these different broadcast domains are isolated from each other. Communication between different broadcast domains requires one or more routers. Such a broadcast domain is called a VLAN.

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