A network communication system which provides cost effective support for two or more WAN transports from a single SD-WAN site. The network communication system, may at times by default, monitor a higher-cost WAN for only basic connectivity to reduce monitoring costs of the transport. Where an application is properly configured, the system may override the default to monitor a higher-cost WAN for acceptable performance (i.e., monitored for connectivity, packet loss, latency, jitter & capacity) even when that WAN is not selected as active transport.