Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\wmi")
Set colMonitoredEvents = objWMIService.ExecNotificationQuery _
    ("Select * from MSNdis_StatusMediaConnect")

Do While True
    Set strLatestEvent = colMonitoredEvents.NextEvent
    Wscript.Echo "A network connection has been made:"
    WScript.Echo strLatestEvent.InstanceName, Now
    Wscript.Echo
Loop

Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\wmi")
Set colMonitoredEvents = objWMIService.ExecNotificationQuery("Select * from MSNdis_StatusMediaDisconnect")

Do While True
    Set strLatestEvent = colMonitoredEvents.NextEvent
    Wscript.Echo "A network connection has been lost:"
    WScript.Echo strLatestEvent.InstanceName, Now
Loop