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The models described further on assume an Ethernet network that consists of nodes where each node has physical ports. Network services have endpoints that connect to ports. The attributes that are specific to an endpoint are modelled as a service attach point. Examples of such attributes are the layer two label(s) used on that port or a point-to-point IP address. An inventory management system (IMS) is used to keep track of everything that is being deployed, and a network resource manager (NRM), such as NSO or Ansible, is used to provision the services on the network. All IP addresses and prefixes are stored in an IP address management (IPAM) tool.