When do passive management agents in SNMP take action?

Passive management agents in SNMP (Simple Network Management Protocol) are designed to respond to specific conditions or events that occur in the network system they are monitoring. This usually includes situations where predefined thresholds are met or specific error conditions arise.

By taking action when these error conditions occur, the passive management agents help ensure that network performance and functionality are maintained without the constant need for manual checks or interventions. This proactive approach allows for more efficient monitoring and management, as issues can be addressed as soon as they are detected rather than waiting for a network management system to request information.

In contrast, scenarios like manual intervention, scheduled regular intervals, or only responding when asked do not align with the inherent functionality of passive management agents, which rely on event-driven responses to maintain optimal network operations.