You are planning to use the IoT Hub service in Azure. Does this service allow for communication from a device to the cloud and from the cloud to the device?

Answer options:

A.Yes
B.No

Answer – A 
Yes, this is possible with this service. 
The Microsoft documentation mentions the following. 

For more information on the Azure IoT Hub service, please visit the below URL- 

https://docs.microsoft.com/en-us/azure/iot-hub/about-iot-hub