Microsoft Microsoft Certifications AZ-220 Questions & Answers

• Question 111:

  You have an Azure IoT solution that includes multiple Azure IoT hubs in different geographic locations and a single Device Provision Service instance. You need to configure device enrollment to assign devices to the appropriate IoT hub based on the following requirements:

  1.

  The registration ID of the device

  2.

  The geographic location of the device

  The load between the IoT hubs in the same geographic location must be balanced.

  What should you use to assign the devices to the IoT hubs?

  A. Static configuration (via enrollment list only)

  B. Lowest latency

  C. Evenly weighted distribution

  D. Custom (Use Azure Function)

  Correct Answer: A

  Set the Device Provisioning Service allocation policy

  The allocation policy is a Device Provisioning Service setting that determines how devices are assigned to an IoT hub. There are three supported allocation policies:

  Lowest latency: Devices are provisioned to an IoT hub based on the hub with the lowest latency to the device.

  Evenly weighted distribution (default): Linked IoT hubs are equally likely to have devices provisioned to them. This is the default setting. If you are provisioning devices to only one IoT hub, you can keep this setting.

  Static configuration via the enrollment list: Specification of the desired IoT hub in the enrollment list takes priority over the Device Provisioning Service-level allocation policy.

  Reference:

  https://docs.microsoft.com/en-us/azure/iot-dps/tutorial-provision-multiple-hubs

• Question 112:

  You have an Azure IoT Central application.

  You add an IoT device named Oven1 to the application. Oven1 uses an IoT Central template for industrial ovens.

  You need to send an email to the managers group at your company as soon as the oven temperature falls below 400 degrees.

  Which two actions should you perform? Each correct answer presents part of the solution.

  NOTE: Each correct selection is worth one point.

  A. Create a SendGrid account in the same resource group as the IoT Central application.

  B. Add a condition that has Time Aggregation set to Off.

  C. Add a condition that has Aggregation set to Minimum.

  D. Add the Manager role to the IoT Central application.

  E. From IoT Central, create a telemetry rule for the template.

  Correct Answer: BE

  Devices use telemetry to send numerical data from the device. A rule triggers when the selected telemetry crosses a specified threshold.

  E: To create a telemetry rule, the device template must include at least one telemetry value. The rule monitors the temperature reported by the device and sends an email when it falls below 400 degrees.

  B: Configure the rule conditions.

  Conditions define the criteria that the rule monitors. In this tutorial, you configure the rule to fire when the temperature exceeds 70?F.

  1.

  Select Temperature in the Telemetry dropdown.

  2.

  Next, choose Is less than as the Operator and enter 400 as the Value.

  3.

  Optionally, you can set a Time aggregation. When you select a time aggregation, you must also select an aggregation type, such as average or sum from the aggregation drop-down.

  Without aggregation, the rule triggers for each telemetry data point that meets the condition.

  With aggregation, the rule triggers if the aggregate value of the telemetry data points in the time window meets the condition.

  

  Reference: https://docs.microsoft.com/en-us/azure/iot-central/core/tutorial-create-telemetry-rules

• Question 113:

  You have 1,000 IoT devices that connect to an Azure IoT hub.

  Each device has a property tag named city that is used to store the location of the device.

  You need to update the properties on all the devices located at an office in the city of Seattle as quickly as possible. Any new devices in the Seattle office that are added to the IoT hub must receive the updated properties also.

  What should you do?

  A. From Automatic Device Management, create an IoT device configuration.

  B. From the IoT hub, generate a query for the target devices.

  C. Create a scheduled job by using the IoT Hub service SDKs.

  D. Deploy an Azure IoT Edge transparent gateway to the Seattle office and deploy an Azure Stream Analytics edge job.

  Correct Answer: A

  Automatic device management in Azure IoT Hub automates many of the repetitive and complex tasks of managing large device fleets. With automatic device management, you can target a set of devices based on their properties, define a desired configuration, and then let IoT Hub update the devices when they come into scope. This update is done using an automatic device configuration or automatic module configuration, which lets you summarize completion and compliance, handle merging and conflicts, and roll out configurations in a phased approach.

  Reference: https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-automatic-device-management

• Question 114:

  You have an existing Azure IoT hub.

  You use IoT Hub jobs to schedule long running tasks on connected devices.

  Which two operations do the IoT Hub jobs support directly? Each correct answer presents a complete solution.

  NOTE: Each correct selection is worth one point.

  A. Trigger Azure functions.

  B. Invoke direct methods.

  C. Update desired properties.

  D. Send cloud-to-device messages.

  E. Disable IoT device registry entries.

  Correct Answer: BC

  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 115:

  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 question, 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 add tags to the device twin.

  Does the solution meet the goal?

  A. Yes

  B. No

  Correct Answer: B

  Instead add the desired properties to the device twin.

  Note: Device Twins are used to synchronize state between an IoT solution's cloud service and its devices. Each device's twin exposes a set of desired properties and reported properties. The cloud service populates the desired properties with values it wishes to send to the device. When a device connects it requests and/or subscribes for its desired properties and acts on them.

  Reference: https://azure.microsoft.com/sv-se/blog/deep-dive-into-azure-iot-hub-notifications-and-device-twin/

• Question 116:

  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?

  A. the scope ID and the Device Provisioning Service endpoint

  B. the primary key of the Device Provisioning Service shared access policy and the global device endpoint

  C. the X.509 device certificate and the certificate chain

  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 117:

  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 question, 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?

  A. Yes

  B. No

  Correct Answer: B

  Instead add the desired properties to the device twin.

  Note: Device Twins are used to synchronize state between an IoT solution's cloud service and its devices. Each device's twin exposes a set of desired properties and reported properties. The cloud service populates the desired properties with values it wishes to send to the device. When a device connects it requests and/or subscribes for its desired properties and acts on them.

  Reference: https://azure.microsoft.com/sv-se/blog/deep-dive-into-azure-iot-hub-notifications-and-device-twin/

• Question 118:

  You have an Azure IoT Central application.

  You need to connect an IoT device to the application.

  Which two settings do you require in IoT Central to configure the device? Each correct answer presents part of the solution.

  NOTE: Each correct selection is worth one point.

  A. Group SAS Primary Key

  B. the IoT hub name

  C. Scope ID

  D. Application Name

  E. Device ID

  Correct Answer: CE

  In your Azure IoT Central application, add a real device to the device template

  1.

  On the Devices page, select the Environmental sensor device template.

  2.

  Select + New.

  3.

  Make sure that Simulated is Off. Then select Create.

  Click on the device name, and then select Connect. Make a note of the device connection information on the Device Connection page - ID scope, Device ID, and Primary key. You need these values when you create your device code:

  

  Reference: https://docs.microsoft.com/bs-cyrl-ba/azure/iot-central/core/tutorial-connect-device-python

• Question 119:

  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.

  A. Trigger Azure functions.

  B. Invoke direct methods.

  C. Update desired properties.

  D. Send cloud-to-device messages.

  E. Disable IoT device registry entries.

  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 120:

  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?

  A. Create an SMS alert in IoT Hub for the Total number of messages used metric.

  B. Create an Azure function that retrieves the quota metrics of the IoT hub.

  C. Configure autoscaling in Azure Monitor.

  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/