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This article mainly introduces the characteristics of the switch and how it is eliminated hub, the text is very detailed, has a certain reference value, interested friends must read!

The hub works at the physical layer, so it is clumsy and cannot recognize MAC frames. Dumb operation, copying all bytes received on one port to other ports, so it has performance issues. In addition, only one host can communicate at the same time, too many hosts communicating at the same time will cause conflicts. In this way, the hub has a lot of problems, but it has one advantage that it is cheap, and the previous switch is expensive, so the hub has not been eliminated at that time.

Features of the switch

Compared with the hub, the switch has many advantages, such as supporting full-duplex communication, having autonomous learning capabilities, etc. Let's take a look at what the switch has:

Multiport: Switches usually have many interfaces, each connected to a host or another switch, and usually operate in full-duplex mode.

Exclusive transmission media, collision-free transmission of data: This is the main advantage of the switch. The switch has parallelism, that is, it can connect multiple pairs of interfaces at the same time, so that multiple pairs of hosts can communicate simultaneously. Moreover, the communication of these hosts is exclusive transmission medium, and there is no collision transmission data.

If 10 hosts in 100Mbit/s local area network A are connected through hubs, the average bandwidth occupied by these hosts is only 10Mbit/s. If it is 100Mbit/s, the host in local area network B is connected through the switch, then because the host in the switch monopolizes the transmission medium, the host that does not occupy it is still 100Mbit/s. The total capacity of a switch with 10 interfaces is 1000Mbit/s.

Store-and-forward: Each interface of a switch has a memory that stores received packets and forwards them to another port.

Self-learning ability: The switch can learn autonomously and establish internal switching tables. Self-learning is the process of recognizing the host connected by the interface. Once you know the hosts on the interface, you don't have to broadcast when you communicate one-to-one.

After introducing the characteristics of switches, you can find that switches have great advantages over hubs. It was equivalent to a smart phone that suppressed all aspects of the elderly. So, when the price of the switch became very cheap, the hub lay down and retired from the stage of history.

The above is "the characteristics of the switch and how it is eliminated hub" all the content of this article, thank you for reading! Hope to share the content to help everyone, more relevant knowledge, welcome to pay attention to the industry information channel!

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