star
HUB
The central media hub can be found at Softpedia. Here they have the CES 2013, Seagate Central. It is a hybrid device the combines the benefits of the external HDD as those of a NAS service.
both hubs and switch can act as a center of a star topology
in star topolgy...
in star topology , the central hub is called...... (i) active hub (ii) passive hub (iii) inactive hub (iv) live hub
HUB
HUB
A hub is a central interchange point. A national hub means they have just the one hub.
A star topology requires a central connecting device, such as a hub, switch, or router. For WANs, you would need a central building that contains connections to the other buildings in the WAN.
For a ring topology each client device is usually attached to a central hub, which is a managed hub, called an MAU or MSAU unit. It contains a grid that manages the electrical portion of the ring.
Hub