By passing packets through various network devices, routers create the limits of the broadcast domain. This prevents communication between devices on the same network while isolating your device from other networks.
A hub or switch's ports are all by default in the same broadcast domain. Routers do not forward broadcasts between broadcast domains since every router port is in a different broadcast domain. VLANs, or virtual LANs, are broadcast domains, which explains why. One or more "server" or "provider" nodes are located by using their MAC addresses or switch ports. These sources can produce broadcast frames that can be transmitted to every other node.
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