АМАТЕК AN-SGM28P24-400 [79/322] The benefits of vlan

78 / 322

6.1.1 The benefits of VLAN

VLAN greatly extends the scale of physical networks. The traditional physical network can

only have a very small scale, which can accommodate thousands of devices, and the physical

network using VLAN can accommodate tens of thousands or even hundreds of thousands of

devices。VLAN has the same function and attribute as the traditional physical network。

The use of VLAN has the following advantages：

 VLAN can effectively control the traffic in the network。

In traditional networks, regardless of the need, all broadcast packets are transmitted to all devices,

increasing the load of the network and equipment. And VLAN can organize the device in a logical

network according to the need, a VLAN is a broadcast domain, broadcast packets are only

transmitted within the VLAN, not across the VLAN 。By dividing the VLAN, the traffic in the

network can be effectively controlled。

 VLAN can improve the security of network。

VLAN equipment only with a VLAN of two layer communication equipment, and if you want

another VLAN communication, must be forwarded through the three layer, three layer forwarding

between the VLAN if not established, no communication between VLAN, can play the role of

isolation, to ensure that each VLAN data security。For example, a company's R & D department

does not want to share with the data of the marketing department, can R & D department to

establish a VLAN, the marketing department to build a VLAN, two VLAN do not establish three

layers of communication channel。

 VLAN makes the device easy to move。

In the traditional network, if the device moves from one location to another, and belongs to

different networks, it is necessary to modify the network configuration of the mobile device,

which is very inconvenient for the user. VLAN is a logical network, can be put in the same

physical location of the equipment designated in the same network, when the mobile device can

also make the equipment belonging to the VLAN, so the mobile device does not need to modify

any configuration。