Azure IoT Hub overview in IOT Protocols - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

What is the primary role of Azure IoT Hub?

Azure IoT Hub is a cloud service designed to:

A Store large amounts of unstructured data from IoT devices

B Manage and facilitate secure communication between IoT devices and the cloud

C Provide a user interface for IoT device configuration only

D Analyze IoT data using built-in machine learning models exclusively

💡 Hint

Think about what connects devices to the cloud securely.

Azure IoT Hub acts as a central message hub that securely connects IoT devices to the cloud, enabling reliable communication.

💻 Command Output

intermediate

Output of Azure CLI command to list IoT hubs

What is the output of this command?

az iot hub list --query "[].name" --output json

A Error: Command not found

B {"name": "MyIoTHub1"}

C ["MyIoTHub1", "MyIoTHub2"]

D []

💡 Hint

The command lists all IoT hubs in your subscription by name.

The command returns a JSON array of IoT hub names available in the current Azure subscription.

❓ Configuration

advanced

Correct connection string format for Azure IoT Hub device

Which option shows the correct format of a device connection string for Azure IoT Hub?

A Host=example.azure-devices.net;Id=myDevice;AccessKey=abc123

B iotHubHost=example.azure-devices.net;device=myDevice;key=abc123

C Hostname=example.azure-devices.net;Device=myDevice;SharedKey=abc123

D HostName=example.azure-devices.net;DeviceId=myDevice;SharedAccessKey=abc123

💡 Hint

Look for exact key names used in Azure IoT Hub connection strings.

The correct keys are HostName, DeviceId, and SharedAccessKey exactly as shown in option D.

❓ Troubleshoot

advanced

Cause of device connection failure to Azure IoT Hub

A device fails to connect to Azure IoT Hub with error 'Unauthorized'. What is the most likely cause?

A Incorrect device connection string or expired key

B IoT Hub service is offline

C Device firmware is outdated

D Network cable unplugged on device

💡 Hint

Unauthorized errors usually relate to credentials or permissions.

Unauthorized errors happen when the device uses wrong or expired credentials to connect to IoT Hub.

🔀 Workflow

expert

Correct order to set up Azure IoT Hub and connect a device

Arrange these steps in the correct order to set up Azure IoT Hub and connect a device:

A 1,2,3,4

B 2,1,3,4

C 1,3,2,4

D 3,2,1,4

💡 Hint

Think about what must exist before you can register devices and send data.

You must first create the IoT Hub, then register devices to get credentials, then configure the device app, and finally send data.