A hub is the same thing as a repeater, the hub is
going to have more ports and that’s the major
difference. A hub is just a multiport repeater, some
hubs have more capabilities than others but that’s
just the basic difference. We don’t see too many
hubs again for reasons I’ll be stating later. Now just
as a reminder, neither hub nor repeater has any
thing to do with MAC address or the datalink layer of
the OSI model. They are strictly physical layer
devices, layer 1 of the OSI model. They perform no
switching, they don’t look at the MAC addresses.
Lets look at a hub with four systems;
continue reading: http://tutorialslodge.com/switching-hub/