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A physical topology defines how different devices are physically cabled together to make a
network while a logical topology describes how the communication between these devices is
carried out across the physical topology. For example 10BaseT has a physical star topology and
FDDI has a physical ring topology. Both of these physical and logical topologies are
independent of each other. For example any sort of Ethernet uses a logical bus topology which
means that you might be using 10BaseT with a physical star topology however these devices are
using a logical bus topology. In a Token Ring different physical and logical topologies are used. Token ring physically uses a Star topology but a Ring topology is involved logically. This situation can some times create problems when some one tries to determine the way devices are connected and the way they communicate. The situation is different in case of FDDI because it uses the same physical and logical topologies: a Ring topology. Following are some general media types and their physical and logical topologies. Ethernet: It uses Bus, Star or Point to Point physical topology and a Bus logical topology. FDDI: It uses Ring physical topology and the same Logical topology. Token Ring: Its physical topology is a Star topology and Ring is a Logical topology. |
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