This in fact happens on the Ethernet. The general trade-off for multicasting, then, is to enable candidate recipients to receive on the one hand, but to minimize the total internet resources devoted to any and all multicasting applications, on the other. Particular partial solutions to this problem are discussed in the remainder of this section. For each outgoing IP packet from this multicast source, a multicast group destination address is specified. This is mapped into an Ethernet broadcast address.
All hosts receive each packet.
H1, H2 and H5 are listening on the specified multicast address. IP delivers the packet to their applications. H4 is not listening. IP receives the packet, and quietly discards it. Even so, the multicasting process is still going on.