Network topology is the arrangement of the various elements (links, nodes, etc.) of a computer network.[1][2] Essentially, it is the topological[3] structure of a network and may be depicted physically or logically. Physical topology is the placement of the various components of a network, including device location and cable installation, while logical topology illustrates how data flows within a network, regardless of its physical design. Distances between nodes, physical interconnections, transmission rates, or signal types may differ between two networks, yet their topologies may be identical.
wikipedia.org/wiki/Network_topology
AdRem NetCrunch is a commercial software product for agentless, cross-platform network monitoring developed by AdRem Software, Inc. The program monitors 65 network services, Windows applications; Windows, Linux, NetWare, BSD, Mac OS X systems and SNMP (v1-3) devices without agents; centralizes fault management by collecting and alerting on events from sources including Windows Event Log, syslogs, and SNMP traps; presents physical and logical network topology as automatically updated dynamic graphical views
Zenoss is a patented, agentless, and hyper-scalable IT monitoring technology that is trusted by more than 35,000 organizations worldwide including Accenture, AT&T, BBC, CenturyLink, Cisco, Cognizant, HBO, Oracle, Rackspace, Salesforce.com, Verizon, VMware, and US Army. Named by Forbes as one of the Top 20 Cloud Companies and CEOs to Work for in 2015, Zenoss customers intelligently manage the complexity of hybrid cloud, converged, and disparate-vendor IT infrastructures.
wikipedia.org/wiki/Zenoss