What is switch technology? Generally speaking, switches are network products based on MAC address recognition that can encapsulate and forward data packets. The switch can "learn" MAC addresses.

The switch was originally designed to solve the problem of hub-shared transmission media, where narrow port bandwidth can easily lead to broadcast storms. The original switch worked on the second layer of the OSI/RM open architecture, so it is also known as the second layer switch.

What are the advantages of switches? After understanding the differences between them, we can correctly understand why Ruijie switches are widely used in current LANs instead of hubs, which is also convenient for us to choose correctly in future network equipment purchases.

The corresponding layers of switch technology and hubs in the OSI/RM open architecture model are different. Hubs work at both the first layer (physical layer) and the second layer (data link layer), while network switches at least work at the second layer. More advanced switches can work at the third layer (network layer) and the fourth layer (transport layer).

The data transmission method of the hub is broadcast, while the data transmission of the switch is purposeful. The data is only sent to the destination node, only the first time it is sent using broadcast if it cannot be found in its own MAC address table, and then because the switching device has a MAC address learning function.

After the second time, it was no longer broadcast transmission, but purposeful transmission. The advantage of this is that data transmission efficiency is improved, there will be no broadcast storm, and there will be no phenomenon of other nodes listening in terms of security.