How does Cisco NSO allow for testing configurations?

Cisco NSO (Network Services Orchestrator) utilizes a network simulation tool known as ncs-netsim to facilitate the testing of configurations. This tool provides a virtualized environment that allows users to simulate network devices and their configurations before applying them to a production environment. The advantage of using ncs-netsim lies in its ability to replicate the behavior of actual network devices, enabling users to validate and troubleshoot configurations effectively without risking disruption to live services.

While other methods like automated scripts or command line can play a role in managing and applying configurations, they do not provide the same level of simulation and testing capabilities as ncs-netsim. Additionally, using a web interface can enhance user interactions and simplify configuration management, but it does not inherently provide a simulation environment for testing purposes. Thus, ncs-netsim stands out as the dedicated solution in Cisco NSO for testing configurations.