A connecting device that connects multiple computers or other devices is the smallest unit of centralized network management. Gathering line
HUB is basically a * * * shared device, and its essence is a repeater, which mainly provides signal amplification and neutralization.
Turn function, which distributes all signals received by one port to all ports.
Hub (... center ...) belongs to the basic equipment in data communication system. Like twisted pair and other transmission media, it is a kind of software that does not need any software.
Hardware devices that support or require little management software management. Widely used in various occasions. The hub works in a local area network (LAN) environment,
Like network card, it is applied to the first layer of OSI reference model, so it is also called physical layer device. In the following cases, the hub is internally electrically interconnected.
When the environment for maintaining LAN is logical bus or ring structure, physical star or tree network structure can be established with hub.
In this regard, the hub acts as a multi-port repeater. In fact, the hub is actually a repeater, which is different in that
Just because hubs can provide more port services, hubs are also called multiport repeaters.
According to the IEEE 802.3 protocol, the role of hub is to randomly select a port device and let it monopolize all the bandwidth, which is the same as the role of hub.
Connecting devices (switches, routers or servers, etc.). ) to communicate. It can be seen that the hub has the following two characteristics when working.
First of all, Hub is just a multi-port signal amplification device. When a port receives a data signal in operation, since the signal is from a signal source,
The transmission from the port to the hub has been attenuated, so the hub will shape and amplify the signal to regenerate (recover) the attenuated signal.
The status at the time of sending, and then forwarded to all other working ports. As can be seen from the way Hub works, it is in the network.
The network only plays the role of signal amplification and forwarding, and its purpose is to expand the transmission range of the network, but it does not have the directional transmission ability of signals. This is-
A set of standard * * * enjoyment equipment. Therefore, some people call the hub "stupid hub" or "dumb hub".
Secondly, the hub only communicates with its upstream devices (such as upper-level hubs, switches or servers), and there is no direct communication between ports at the same level.
Instead, information is broadcast to all ports through uplink devices. It can be seen that even if communication is carried out between two different ports of the same hub,
There must be two steps: the first step is to upload the information to the uplink device; The second step is to connect devices and broadcast information to all ports.
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