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- (Exam Topic 3)
You have 10 IoT devices that connect to an Azure IoT hub named Hub1.
From Azure Cloud Shell, you run az iot hub monitor-events --hub-name Hub1 and receive the following error message: "az iot hub: 'monitor-events' is not in the 'az iot hub' command group. See 'az iot hub
--help'."
You need to ensure that you can run the command successfully. What should you run first?
Correct Answer:D
Execute az extension add --name azure-cli-iot-ext once and try again.
In order to read the telemetry from your hub by CLI, you have to enable IoT Extension with the following commands:
Add: az extension add --name azure-cli-iot-ext Reference:
https://github.com/MicrosoftDocs/azure-docs/issues/20843
- (Exam Topic 3)
You have an Azure IoT solution that includes an Azure IoT hub, 100 Azure IoT Edge devices, and 500 leaf devices.
You need to perform a key rotation across the devices.
Which three types of entities should you update? Each Answer presents part of the solution. NOTE: Each correct selection is worth one point.
Correct Answer:ADF
To get authorization to connect to IoT Hub, devices and services must send security tokens signed with either a shared access or symmetric key. These keys are stored with a device identity in the identity registry.
An IoT Hub identity registry can be accessed like a dictionary, by using the deviceId or moduleId as the key. Reference:
https://docs.microsoft.com/bs-latn-ba/azure/iot-dps/how-to-control-access https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-identity-registry
- (Exam Topic 3)
You plan to deploy an Azure IoT hub. The IoT hub must support the following:
Three Azure IoT Edge devices 2,500 IoT devices Each IoT device will spend a 6 KB message every five seconds.
You need to size the IoT hub to support the devices. The solution must minimize costs. What should you choose?
Correct Answer:D
\\ 2500* 6 KB * 12 = 180,000 KB/minute = 180 MB/Minute.
B3, S3 can handle up to 814 MB/minute per unit. Incorrect Answers:
A, C: B1, S1 can only handle up to 1111 KB/minute per unit B: B2, S2 can only handle up to 16 MB/minute per unit.
Reference:
https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-scaling
- (Exam Topic 3)
You have 10,000 IoT devices that connect to an Azure IoT hub. The devices do not support over-the-air (OTA) updates.
You need to decommission 1,000 devices. The solution must prevent connections and autoenrollment for the decommissioned devices.
Which two actions should you perform? Each correct answer presents part of the solution. NOTE: Each correct selection is worth one point.
Correct Answer:BC
B: X.509 certificates are typically arranged in a certificate chain of trust. If a certificate at any stage in a chain becomes compromised, trust is broken. The certificate must be blacklisted to prevent Device Provisioning Service from provisioning devices downstream in any chain that contains that certificate.
C: Individual enrollments apply to a single device and can use either X.509 certificates or SAS tokens (in a real or virtual TPM) as the attestation mechanism. (Devices that use SAS tokens as their attestation mechanism can be provisioned only through an individual enrollment.) To blacklist a device that has an individual enrollment, you can either disable or delete its enrollment entry.
To blacklist a device that has an individual enrollment, you can either disable or delete its enrollment entry. Reference:
https://docs.microsoft.com/en-us/azure/iot-dps/how-to-revoke-device-access-portal
- (Exam Topic 3)
You deploy an Azure IoT hub.
You need to demonstrate that the IoT hub can receive messages from a device.
Which three actions should you perform in sequence? To answer, move the appropriate actions from the list of actions to the answer area and arrange them in the correct order.
Solution:
Step 1: Register a device in IoT Hub
Before you can use your IoT devices with Azure IoT Edge, you must register them with your IoT hub. Once a device is registered, you can retrieve a connection string to set up your device for IoT Edge workloads.
Step 2: Configure the device connection string on a device client.
When you're ready to set up your device, you need the connection string that links your physical device with its identity in the IoT hub.
Step 3: Trigger a new send event from a device client. Reference:
https://docs.microsoft.com/en-us/azure/iot-edge/how-to-register-device
Does this meet the goal?
Correct Answer:A