What is the difference and connection between a LAN switch and a LAN hub

The switch can effectively isolate the collision domain, each port of the switch is an independent collision domain, and the hub cannot isolate the collision domain, all ports are in a collision domain, so it is easy to network congestion.

The switch works duplex, while the hub works simplex, the difference is equivalent to a mobile phone and a walkie-talkie, the mobile phone you can hear if the other party talks when you speak, but the walkie-talkie If you talk when the other party also speaks, you may not be able to hear it on both sides.

Switches and hubs are the basic equipment used in the formation of local area networks, some people think that switches and hubs can be used instead of each other, and then in fact they can't, the switch can choose the target port, reduce network conflicts, the route is exclusive, and the hub is to collect and amplify the signal and then transmit it, the signal is shared, they are irreplaceable, thenThe difference between a switch and a hubThe difference between a switch and a hub stoolOne.

The 1 hub is a multi-port device, which works at the physical layer and is a Layer 1 device, while the switch is a MAC and works mainly at the data link layer and is a Layer 2 device.

The difference between a switch and a hubTwo.

The port of the hub is a pure travel broadband network, the more ports are accessed, the slower the network speed, and its network speed will be occupied by other ports, and the switch is exclusive to each port of broadband, included in the 100 megabit switch we usually use, it can ensure that each port has a 100 megabit bandwidth network.

The difference between a switch and a hubThree.

The PC devices connected to the hub are evenly divided broadband, because there is only one communication line on the hub, so the bandwidth is equally divided, one of the devices can only accept and cannot send data when one of the devices is sending, and the devices connected by the switch will not affect each other, and each store can enjoy exclusive broadband.

The difference between a switch and a hubFour.

Each port of the switch is a collision domain, so all ports are in a broadcast domain, and all ports in the hub are in a collision domain and a broadcast domain.

The difference between a switch and a hubFive.

The working principle of the limiter is the principle of broadcasting pants, no matter which port the signal packet is received from, it will be sent to other ports in the form of broadcasting, so that there is a problem, especially when the network range is large, the network performance will be affected, and the switch is based on the MAC address for switching, which port can clarify the MAC address of the network card on which port, and then only the signal packet will be sent to the corresponding port, and the note is not prone to large-scale network performance failure.

The difference between a switch and a hubSix.

The self-efficiency of the switch is relatively low, and it can only exit one signal packet at a time, and when the signal packet appears at the same time on multiple ports, it is easy to collide, which is not suitable for those relatively large network backbones.

From the perspective of building a local area network, the performance of the switch is better than that of the hub, and it is more secure and convenient than the hub, but it is also relatively higher than the hub.

The difference between a switch and a hub.

First, from the perspective of OSI architecture.

Hubs belong to Layer 1 physical layer design, while switches belong to OSI's Layer 2 data link layer devices.

Second, from the perspective of working methods.

The hub is a broadcast mode, that is to say, when a certain port of the hub is working, all other ports can listen to the information, which is easy to produce broadcast storms, and the network performance will be greatly affected when the network is large;

The switch can avoid this phenomenon, when the switch is working, only the port that makes the request and the destination port respond to each other without affecting other ports, so the switch can isolate the collision domain and effectively suppress the generation of broadcast storms.

Third, from the perspective of bandwidth.

No matter how many ports there are in the hub, all ports share a bandwidth, and only two ports can transmit data at the same time, and the other ports can only wait, and the hub can only work in half-duplex mode;

For the switch, each port has an exclusive bandwidth, when the two ports work, it does not affect the work of the other ports, and the switch can not only work in half-duplex mode but also work in full-duplex mode.

The role of hubs and switches.

The main function of the hub is to regenerate and amplify the received signal to expand the transmission distance of the network, and at the same time concentrate all nodes on the node centered on it.

Like hubs, switches provide a large number of ports for cable connection, which allows for star topology cabling.

The main function of the switch is to act like repeaters, hubs and bridges, when it is framed, the switch will regenerate an undistorted square electrical signal. Like bridges, switches use the same ** or filtering logic on each port.

Like bridges, switches divide the LAN into multiple collision domains, each of which has its own bandwidth, thus greatly increasing the bandwidth of the LAN.

In addition to the functions of bridges, hubs, and repeaters, switches offer more advanced features such as virtual local area networks (VLANs) and higher performance.