Scenario 1 - Deploying the NPS Across the Lower-Level Managed Access Switches

Most industrial switches connecting level 1 and level 2 devices across an industrial network do not support RSPAN. In this scenario, local spanning of such lower-level access switches and deploying the Network Passive Sensor (NPS) provides the best output. Tapping the higher level switch is not sufficient as the unicast traffic in the lower-level access switches may not necessarily traverse to the higher level switch.