As noted earlier, a broadcast domain includes all devices that receive each other's broadcasts (and multicasts). All the devices connected to one router port are in the same broadcast domain. Routers block broadcasts (destined for all networks) and multicasts by default; routers only forward unicast packets (destined for a specific device) and packets of a special type called directed broadcasts. Typically, you think of a broadcast domain as being a physical wire, a LAN. But a broadcast domain can also be a VLAN, a logical construct that can include multiple physical LAN segments.
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