You have an Azure Stream Analytics job that connects to an Azure IoT hub named Hub1445 as a streaming data source. Hub1445 is configured as shown in the exhibit.
The Stream Analytics job fails to receive any messages from the IoT hub.
What should you do to resolve the issue?
The issue is that the Stream Analytics job is not receiving messages from the IoT hub. In the Hub1445 configuration, if messages do not match any of the specified routes, they are not sent anywhere. Enabling the fallback route ensures that any messages that do not match the existing routes are still processed. This will ensure no messages are lost due to not meeting specific route criteria.
B is ok as from https://docs.microsoft.com/en-us/azure/iot-hub/troubleshoot-message-routing you may take it the same as with l3 routing, i.e if on vlan there is a route other then default