AZ-220 Microsoft Azure IoT Developer exams demo

Implement the IoT solution infrastructure
Question Set 2
QUESTION 1
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 an Azure IoT solution that includes an Azure IoT hub, a Device Provisioning Service instance, and
1,000 connected IoT devices.
All the IoT devices are provisioned automatically by using one enrollment group.
You need to temporarily disable the IoT devices from the connecting to the IoT hub.
Solution: From the Device Provisioning Service, you disable the enrollment group, and you disable device
entries in the identity registry of the IoT hub to which the IoT devices are provisioned.
Does the solution meet the goal?
A. Yes
B. No
Correct Answer: A
Section: (none)
Explanation
Explanation/Reference:
Explanation:
You may find it necessary to deprovision devices that were previously auto-provisioned through the Device
Provisioning Service.
In general, deprovisioning a device involves two steps:
1. Disenroll the device from your provisioning service, to prevent future auto-provisioning. Depending on
whether you want to revoke access temporarily or permanently, you may want to either disable or delete an
enrollment entry.
2. Deregister the device from your IoT Hub, to prevent future communications and data transfer. Again, you
can temporarily disable or permanently delete the device's entry in the identity registry for the IoT Hub where it
was provisioned.
Reference:
https://docs.microsoft.com/bs-latn-ba/azure/iot-dps/how-to-unprovision-devices
QUESTION 2
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 an Azure IoT solution that includes an Azure IoT hub, a Device Provisioning Service instance, and
1,000 connected IoT devices.
96CE4376707A97CE80D4B1916F054522
All the IoT devices are provisioned automatically by using one enrollment group.
You need to temporarily disable the IoT devices from the connecting to the IoT hub.
Solution: You delete the enrollment group from the Device Provisioning Service.
Does the solution meet the goal?
A. Yes
B. No
Correct Answer: B
Section: (none)
Explanation
Explanation/Reference:
Explanation:
Instead, from the Device Provisioning Service, you disable the enrollment group, and you disable device entries
in the identity registry of the IoT hub to which the IoT devices are provisioned.
Reference:
https://docs.microsoft.com/bs-latn-ba/azure/iot-dps/how-to-unprovision-devices
QUESTION 3
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 an Azure IoT solution that includes an Azure IoT hub, a Device Provisioning Service instance, and
1,000 connected IoT devices.
All the IoT devices are provisioned automatically by using one enrollment group.
You need to temporarily disable the IoT devices from the connecting to the IoT hub.
Solution: From the IoT hub, you change the credentials for the shared access policy of the IoT devices.
Does the solution meet the goal?
A. Yes
B. No
Correct Answer: B
Section: (none)
Explanation
Explanation/Reference:
Reference:
https://docs.microsoft.com/bs-latn-ba/azure/iot-dps/how-to-unprovision-devices
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QUESTION 5
You plan to deploy a standard tier Azure IoT hub.
You need to perform an over-the-air (OTA) update on devices that will connect to the IoT hub by using
scheduled jobs.
What should you use?
A. a device-to-cloud message
B. the device twin reported properties
C. a cloud-to-device message
D. a direct method
Correct Answer: D
Section: (none)
Explanation
Explanation/Reference:
Explanation:
Releases via the REST API.
All of the operations that can be performed from the Console can also be automated using the REST API. You
might do this to automate your build and release process, for example.
You can build firmware using the Particle CLI or directly using the compile source code API.
Note: Over-the-air (OTA) firmware updates are a vital component of any IoT system. Over-the-air firmware
updates refers to the practice of remotely updating the code on an embedded device.
Reference:
https://docs.particle.io/tutorials/device-cloud/ota-updates/
QUESTION 6
You have an IoT device that gathers data in a CSV file named Sensors.csv.
You deploy an Azure IoT hub that is accessible at ContosoHub.azure-devices.net.
You need to ensure that Sensors.csv is uploaded to the IoT hub.
Which two actions should you perform? Each correct answer presents part of the solution.
NOTE: Each correct selection is worth one point.
A. Upload Sensors.csv by using the IoT Hub REST API.
96CE4376707A97CE80D4B1916F054522
B. From the Azure subscription, select the IoT hub, select Message routing, and then configure a route to
storage.
C. From the Azure subscription, select the IoT hub, select File upload, and then configure a storage
container.
D. Configure the device to use a GET request to ContosoHub.azure-devices.net/devices/ContosoDevice1/files/
notifications.
Correct Answer: AC
Section: (none)
Explanation
Explanation/Reference:
Explanation:
C: To use the file upload functionality in IoT Hub, you must first associate an Azure Storage account with your
hub. Select File upload to display a list of file upload properties for the IoT hub that is being modified.
For Storage container: Use the Azure portal to select a blob container in an Azure Storage account in your
current Azure subscription to associate with your IoT Hub. If necessary, you can create an Azure Storage
account on the Storage accounts blade and blob container on the Containers
A: IoT Hub has an endpoint specifically for devices to request a SAS URI for storage to upload a file. To start
the file upload process, the device sends a POST request to {iot hub}.azure-devices.net/devices/{deviceId}/files
with the following JSON body:
{
"blobName": "{name of the file for which a SAS URI will be generated}"
}
Incorrect Answers:
D: Deprecated: initialize a file upload with a GET. Use the POST method instead.
Reference:
https://github.com/MicrosoftDocs/azure-docs/blob/master/articles/iot-hub/iot-hub-configure-file-upload.md
QUESTION 7
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?
A. one unit of the S1 tier
B. one unit of the B2 tier
C. one unit of the B1 tier
D. one unit of the S3 tier
Correct Answer: D
Section: (none)
Explanation
Explanation/Reference:
96CE4376707A97CE80D4B1916F054522
Explanation:
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
QUESTION 8
DRAG DROP
You deploy an Azure IoT hub.
You need to demonstrate that the IoT



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