Broadcast is a packet that’s sent to all devices on specific network. The destination address in the packet is the special broadcast address. If the packet has a broadcast address, all devices that receive that message will process it. So, all devices on the same network segment will see the same message. Another thing to remember is that routers don’t forward broadcast messages. The router will receive the broadcast traffic, but it will not forward it through the router.

Source: http://www.utilizewindows.com/the-difference-between-unicast-multicast-and-broadcast-messages/

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