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Microsoft AZ-220 Exam Practice Questions (P. 5)

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Question #21
You have an existing Azure IoT hub.
You use IoT Hub jobs to schedule long running tasks on connected devices.
Which three operations do the IoT Hub jobs support directly? Each correct answer presents a complete solution.
NOTE: Each correct selection is worth one point.
  1. A
    Trigger Azure functions.
  2. B
    Invoke direct methods.
  3. C
    Update desired properties.
  4. D
    Send cloud-to-device messages.
  5. E
    Disable IoT device registry entries.
  6. F
    Update tags.

Correct Answer:
BCF
Consider using jobs when you need to schedule and track progress any of the following activities on a set of devices:
✑ Invoke direct methods
✑ Update desired properties
✑ Update tags
Reference:
https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-jobs

Question #22
You have an Azure IoT hub.
You need to recommend a solution to scale the IoT hub automatically.
What should you include in the recommendation?
  1. A
    Create an SMS alert in IoT Hub for the Total number of messages used metric.
  2. B
    Create an Azure function that retrieves the quota metrics of the IoT hub.
  3. C
    Configure autoscaling in Azure Monitor.
  4. D
    Emit custom metrics from the IoT device code and create an Azure Automation runbook alert.

Correct Answer:
B
Note: IoT Hub is scaled and priced based on an allowed number of messages per day across all devices connected to that IoT Hub. If you exceed the allowed message threshold for your chosen tier and number of units, IoT Hub will begin rejecting new messages. To date, there is no built-in mechanism for automatically scaling an IoT Hub to the next level of capacity if you approach or exceed that threshold.
Reference:
https://docs.microsoft.com/en-us/samples/azure-samples/iot-hub-dotnet-autoscale/iot-hub-dotnet-autoscale/

Question #23
You have an Azure IoT hub that uses a Device Provisioning Service instance.
You create a new individual device enrollment that uses symmetric key attestation.
Which detail from the enrollment is required to auto provision the device by using the Device Provisioning Service?
  1. A
    the registration ID of the enrollment
  2. B
    the primary key of the enrollment
  3. C
    the device identity of the IoT hub
  4. D
    the hostname of the IoT hub

Correct Answer:
A
The registration ID is used to uniquely identify a device registration with the Device Provisioning Service. The device ID must be unique in the provisioning service
ID scope. Each device must have a registration ID.
Note: An individual enrollment is an entry for a single device that may register. Individual enrollments may use either X.509 leaf certificates or SAS tokens (from a physical or virtual TPM) as attestation mechanisms. The registration ID in an individual enrollment is alphanumeric, lowercase, and may contain hyphens.
Reference:
https://docs.microsoft.com/en-us/azure/iot-dps/concepts-service#enrollment

Question #24
You have an Azure IoT hub that uses a Device Provisioning Service instance to automate the deployment of Azure IoT Edge devices.
The IoT Edge devices have a Trusted Platform Module (TPM) 2.0 chip.
From the Azure portal, you plan to add an individual enrollment to the Device Provisioning Service that will use the TPM of the IoT Edge devices as the attestation mechanism.
Which detail should you obtain before you can create the enrollment?
  1. A
    the scope ID and the Device Provisioning Service endpoint
  2. B
    the primary key of the Device Provisioning Service shared access policy and the global device endpoint
  3. C
    the X.509 device certificate and the certificate chain
  4. D
    the endorsement key and the registration ID

Correct Answer:
D
The TPM simulator's Registration ID and the Endorsement key, are used when you create an individual enrollment for your device.
Reference:
https://docs.microsoft.com/en-us/azure/iot-edge/how-to-auto-provision-simulated-device-linux

Question #25
Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution.
After you answer a question in this section, you will NOT be able to return to it. As a result, these questions will not appear in the review screen.
You have devices that connect to an Azure IoT hub. Each device has a fixed GPS location that includes latitude and longitude.
You discover that a device entry in the identity registry of the IoT hub is missing the GPS location.
You need to configure the GPS location for the device entry. The solution must prevent the changes from being propagated to the physical device.
Solution: You use an Azure policy to apply tags to a resource group.
Does the solution meet the goal?
  1. A
    Yes
  2. B
    No

Correct Answer:
B
Instead tags should be added to the Device twin.
Tags: A section of the JSON document that the solution back end can read from and write to. Tags are not visible to device apps.
Reference:
https://docs.microsoft.com/de-de/azure/iot-hub/iot-hub-devguide-device-twins https://azure.microsoft.com/sv-se/blog/deep-dive-into-azure-iot-hub-notifications-and-device-twin/

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