What is a switch? Network Switch is a kind of network hardware, which receives and forwards data to target equipment through message exchange. It is a device to expand the network, which can provide more connection ports for the sub-network to connect more computers.
It seems that people can’t feel the switch in your life. But I believe you can understand it through comparison and examples.
All residents of Building 5 in the community use the same Internet cable:
If you use the switch at this time, as a resident, you need to dial the Internet, but the residents use their own broadband, and the network speed will not be limited by other residents.
If you use a router (which has a virtual dialing function more than the switch, but also includes the basic functions of the switch, which will be mentioned below) to access the Internet, and residents share an IP address, that is, a network. When you are playing games and neighbors are downloading movies, it is likely to be directly blocked out.
Such a familiar scene was suddenly dragged into the real life. Is it understandable?
In order to give you a better understanding of switches, let’s compare the differences between switches and hubs.
Two computers can be directly connected by connecting the network port to the network cable. However, if three computers are connected, it is impossible to connect three computers at the same time. Therefore, a “small box”, that is, a hub, is required.
The hub itself has many network ports, which can link multiple computers.
However, if A and B want to talk privately, or B wants to talk privately with C, due to the limitations of the hub itself, everyone will see the private chat message. If two people send messages to one person at the same time, the messages of these two people will disappear at the same time and cannot be sent out together.
What if there is a switch at this time?
The switch has its own “translation” function. It will name the computer network ports of A, B and C respectively to identify everyone’s computer. When A wants to send information to B, there will be no “disorder” of the hub, but as we do now, it will achieve the freedom of private conversation.
Strictly speaking, hubs do not belong to switches in a narrow sense, but they play an important role in the early stage of network development and occupy the application position of current access switches for a long time, so they are often regarded as Layer 1 switches.
Someone would wonder that they have heard of the core switch before. What’s the difference between the core switch and the ordinary switch?
If you need to control more computers (such as more than 50), you will probably need this core switch.
The common switch can be configured with VLAN simple routing protocol and some simple SNMP and other functions at most. The backplane bandwidth is relatively small.
The core switch is aimed at the network architecture. If it is a small LAN with several computers, an 8-port switch can be called a core switch.
What is the big difference between common and core?
It can be said that the core switch is not a type of switch, but a switch placed in the core layer (network backbone), which is called the core switch (common switches are often in the convergence layer).