A network management system (NMS) automatically models a path for a customer's services from a terminating unit through elements typically on a link-by-link basis, across networks if appropriate, to a network service provider (NSP) or Internet service provider (ISP). The path may be a private virtual circuit or connection (PVC), and it may traverse an "overall network" including other networks such as an asymmetric digital subscriber line (ADSL) service or sub-networks. To model a path, the NMS creates a topology including the elements and links in the overall network and respective features, functions, characteristics, and capacities thereof. The topology allows the NMS to speedily, efficiently, and automatically provision a customer's service from the terminating unit to connection to the customer's selected NSP or ISP for Internet access.