In a star LAN structure, the device connecting the file server and the workstation is a hub. The main function of the hub is to regenerate, shape and amplify the received signal to expand the transmission distance of the network and at the same time centralize all nodes. On the node centered on it, it belongs to the basic equipment in the local area network.
In a star LAN structure, the device connecting the file server and the workstation is a hub.
In a star LAN structure, a hub is used to connect the file server to the workstation.
The hub is called "Hub" in English. "Hub" means "center". The main function of the hub is to regenerate, shape 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. It works on the first layer of the OSI (Open Systems Interconnection Reference Model) reference model, which is the "physical layer". Hubs, like network cards, network cables and other transmission media, are basic devices in the local area network and adopt CSMA/CD (Carrier Sense Multiple Access Technology with Conflict Detection) media access control mechanism. Each interface of the hub simply sends and receives bits. If it receives a 1, it will forward a 1. If it receives a 0, it will forward a 0. No collision detection is performed.
A hub is a pure hardware network underlying device and basically does not have the "intelligent memory" and "learning" capabilities similar to switches. It also does not have the MAC address table that the switch has, so when it sends data, it is not targeted, but uses broadcast mode to send it. That is to say, when it wants to send data to a certain node, it does not send the data directly to the destination node, but sends the data packet to all nodes connected to the hub, as shown in the figure, simple and clear.
HUB is a multi-port repeater. When HUB is used as the central device, if a certain line in the network fails, it will not affect the work of other lines. Therefore, HUB has been widely used in local area networks. Most of the time, it is used in star and tree network topologies, and is connected to each host through an RJ45 interface (there are also BNC interfaces). There are many types of HUB according to different sayings.
Introduction
A hub refers to a device that connects multiple Ethernet twisted pairs or optical fibers together under the same physical medium. A hub is the physical layer that operates in the OSI model. It can be regarded as a multi-port repeater. If it detects a collision, it will submit a blocking signal.
The hub usually comes with a BNC and/or AUI adapter to connect to a traditional 10BASE2 or 10BASE5 network.
Since the hub will regenerate or amplify any received digital signal and then submit it from all ports of the hub, this will cause a high chance of collision between signals, and the signal may also be eavesdropped, and This means that all devices connected to the hub belong to the same collision domain name and broadcast domain name, so most hubs have been replaced by switches.
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