A hub is a hardware device that allows nodes (computers) to be linked together and exchange data.
Every node on a wired network is connected to the hub by a cable.
Each node will be connected to a single 'port' (like a socket for a plug) on the hub. So if you purchase an '8-port hub', you will be able to connect up to eight nodes together.
Data is moved around the network in the form of data 'packets'. A data packet is a small chunk of data that has a destination address included.
When a data packet arrives at a hub port, it is transmitted to every other port and from there to every node on the network. This is inefficient, since the data is generally intended to reach only one computer and yet a hub will send it to all of them at once.
You can also 'daisy chain' hubs, connecting one hub to another hub, to allow even more computers to join the network. However there is a problem with doing this - see the following page for more details.
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Click on this link: What is a network hub