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<p>Group communication may either be <a href="page.php?w=application_layer">application layer</a> multicast or network-assisted multicast, where the latter makes it possible for the source to efficiently send to the group in a single transmission. Copies are automatically created in other network elements, such as <a href="page.php?w=router_%28computing%29">routers</a>, <a href="page.php?w=Network_switch">switches</a> and <a href="page.php?w=base_station_subsystem">cellular network base stations</a>, but only to network segments that currently</p><p>
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