The network structure of several devices that enables data exchange among each other is described as a topology. The physical topology describes the structure of the connections and the logical topology describes the data flow within the connections. The particular topology of a network determines its fail-safe characteristics. Only in the case of alternative/redundant connections between the components does the functionality of the system as a whole remain intact when individual components fail.
You'll find useful webinar recordings, such as Network Topology-Part 1 and Network Topology-Part 2 in our Downloads section.