A system and method is provided for using network asset management data including attributes such as device type, location, and link speed for modeling network performance and identifying performance issues. The invention provides measured and observed performance data for one or more segments of a network (e.g., one or more hops or end to end) so that identification of diminished performance in the network might be accomplished. Additionally, the invention may provide projections of performance impacts based upon proposed changes to one or more components in the network. Performance metrics, ping times, MIB data, link speeds, propagation delays, device latency, serialization rates, conversational speeds, conversational utilization and other data are used to model a network for determining or isolating problematic issues and to forecast performance impacts of potential changes to the network.