Logical Topology and Physical Topology
Topology is always useful when looking at how a network is physically constructed or wired. This gives the network technician some idea of how the network is put together when diagnosing problems.
Network topology is the way a computer network is set up and arranged, Examples for possible topologies include ring, star, bus, and line. Each of these topologies have their advantages and disadvantages, with star being the most common in today's world.
Well there are not many disadvantages that I know of about the star Topology. I think this the most widely used topology today but as we say everything has 2 sides so this topology although having many plus points have some disadvantages as well..Some of the few are ::Expensive as compared to other topologies.Additional Hardware which is the HUB & the connecting Cables is required & hence becomes more overhead of administration.If the Central Device which is the HUB goes down the entire network is affected.The main disadvantage is that the entire network is dependent on the central router. If that fails, the entire network fails. From a security standpoint - flooding the central hub with a DOS (or DDOS) attack brings down the entire network. In a more distributed network you wouldn't have that single point of failure.
You are thinking ring topology. Not used much today.
No, today virtually all networks use some variation of a star topology. It's far less subject to failure.
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The most commonly barometer used today would be a Aneroid.
Actually, even before the bus topology, the mesh topology was used. This provided a direct link from one computer to another and this was copied for all the computers so that they had links to all others in the network. Of course this became quite cumbersome very quickly, so other topologies were developed such as bus (as used in 10Base2 and 10Base5), star (as used in 10BaseT, 100BaseT, and Gigabit Ethernet as well as the old Arcnet), and ring (most notably used in Token Ring). The ring topology has pretty much fallen into disuse as of today but the bus topology is still used. The most common place to find it is in the delivery of cable TV and cable modem service. It comes through the neighborhood on a trunk line and then each home or office has a tap into that big trunk. It is also used in the delivery of other services to homes and businesses: specifically natural gas, water, and sewer. The star topology is utilized by the phone company to deliver standard phone service as well as DSL services. This is a direct link between the service location and the DSLAM. In this case, the DSLAM is assuming the role of the concentrator or network switch.If you have any other questions, feel free to let me know.