DRAG DROP
You have an Azure IoT hub.
You plan to attach three types of IoT devices as shown in the following table.
You need to select the appropriate communication protocol for each device.
What should you select? To answer, drag the appropriate protocols to the correct devices. Each protocol may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content. NOTE: Each correct selection is worth one point.
Answer: 
Explanation:
Box 1: AMQP
Use AMQP on field and cloud gateways to take advantage of connection multiplexing across devices.
Box 2: MQTT
MQTT is used on all devices that do not require to connect multiple devices (each with its own per-device credentials) over the same TLS connection.
Box 3: HTTPS
Use HTTPS for devices that cannot support other protocols.
Reference:
https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-protocols
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