A collapsed backbone (also known as inverted backbone or backbone-in-a-box) is a type of backbone network architecture. In the case of a collapsed backbone, each location features a link back to a central location to be connected to the collapsed backbone.OverviewA backbone network or core network is a part of a which interconnects networks, providing a path for the exchange of information between different or. A backbone can tie toge. The theory, design principles, and first instantiation of the backbone network came from the telephone core network when traffic was purely voice. The core network was the central part of a Typically th. Core networks typically provided the following functionality: 1. Aggregation: The highest level of aggregation in a service provider network. The next level in the hierarchy under the core node.