With reference to [Ethernet], a broadcast is defined as a packet that will be sent to all hosts on in the broadcast domain.



A broadcast is addressed to a [MAC] of FF-FF-FF-FF-FF-FF, or a [subnet] mask of 255.255.255.255.



A broadcast domain is only able to be segregated by OSI layer 3 devices (routers), in effect if a host is on the same network/[subnet] it will receive any broadcast sent on that network. However, the boundary between layer 2 and 3 is blurred by VLAN Switches - which also separate broadcast domains.



{http://www.gummay.net/images/broadcast.jpg Broadcast!}

'''Diagram 1:''' In this situation, server has sent a broadcast to the network. Each workstation receives a copy.