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A collapsed backbone is a type of network structure or configuration that is sometimes used in the creation of local area networks or LANs.The configuration often includes the use of switching or routing hubs as part of the overall design, with a central point of origin providing the feed for all the hubs. collapsed backbone is a type of network structure or configuration that is sometimes used in the creation of local area networks or LANs.
Topologies are either physical or logical. There are four principal topologies used in LANs. These topologies can also be mixed. For example, a bus-star network consists of a high-bandwidth bus, called the backbone,which connects a collections of slower-bandwidth star segments. For network diagrams, see Network Topology Diagrams in the Quick Referencesection of Webopedia.