LAN isolation

In the process of network transmission, if all hubs are used. It is certain that in the transmission process, because too many signals need to be broadcast, the conflict domain will be generated. At this time, the communication between signals will be seriously disrupted, and the devices in the same hub will not be able to communicate. 

In order to solve this problem, science and technology must continue to develop and innovate. Switch introduced.
As shown in the figure above, with the switch as the current terminal, the switch has the function of isolation. The communication between two devices will not affect the communication rates of other devices, so the function of isolation is at least real. The switch can divide a large conflict domain into multiple small conflict domains, which can reduce the range of conflict domains and data congestion.
The conflict domain has been isolated above, but imagine that when there are more and more devices, each device sends a broadcast, and the switch needs to copy each broadcast to all devices. This overhead is terrible, which will cause a broadcast storm and seriously affect the direct communication of devices. 
To solve the above problem, we use a router to isolate the broadcast domain. 

Isolation of the broadcast domain 
When the router receives the broadcast, it will automatically discard it, and it will not be forwarded to other ports of the router, thus realizing the division of the broadcast domain. 
This is also the significance of the router. If the whole network is concentrated in one broadcast domain, it is easy to cause broadcast, which will lead to the paralysis of the whole network. 
The above is the explanation of LAN Isolation brought by Shenzhen HDV Phoelectron Technology Co., Ltd. Shenzhen Haidiwei Optoelectronics Technology Co., Ltd. is a manufacturer specializing in optical communication equipment products.