Microsoft Azure IoT Developer Practice Test

AZ-220 Exam Format | Course Contents | Course Outline | Exam Syllabus | Exam Objectives

The content of this exam will be updated on September 24, 2020. Please download the exam skills outline below to see what will be changing.
Implement the IoT solution infrastructure (15-20%)
Provision and manage devices (20-25%)
Implement Edge (15-20%)
Process and manage data (15-20%)
Monitor, troubleshoot, and optimize IoT solutions (15-20%)
Implement security (15-20%)

Implement the IoT Solution Infrastructure (15-20%)
Create and configure an IoT Hub
 create an IoT Hub
 register a device
 configure a device twin
 configure IoT Hub tier and scaling
Build device messaging and communication
 build messaging solutions by using SDKs (device and service)
 implement device-to-cloud communication
 implement cloud-to-device communication
 configure file upload for devices
Configure physical IoT devices
 recommend an appropriate protocol based on device specifications
 configure device networking, topology, and connectivity
Provision and manage devices (20-25%)
Implement the Device Provisioning Service (DPS)
 create a Device Provisioning Service
 create a new enrollment in DPS
 manage allocation policies by using Azure Functions
 link an IoT Hub to the DPS
Manage the device lifecycle
 provision a device by using DPS
 deprovision an autoenrollment
 decommission (disenroll) a device
Manage IoT devices by using IoT Hub
 manage devices list in the IoT Hub device registry
 modify device twin tags and properties
 trigger an action on a set of devices by using IoT Hub Jobs and Direct Methods
 set up Automatic Device Management of IoT devices at scale
Build a solution by using IoT Central
 define a device type in Azure IoT Central
 configure rules and actions in Azure IoT Central
 define the operator view
 add and manage devices from IoT Central
 monitor devices
 custom and industry-focused application templates
 monitor application health using metrics
Implement Edge (15-20%)
Set up and deploy an IoT Edge device
 create a device identity in IoT Hub
 deploy a single IoT device to IoT Edge
 create a deployment for IoT Edge devices
 install container runtime on IoT devices
 define and implement deployment manifest
 update security daemon and runtime
 provision IoT Edge devices with DPS
 IoT Edge automatic deployments
 deploy on constrained devices
 secure IoT Edge solutions
 deploy production certificates
Develop modules
 create and configure an Edge module
 deploy a module to an Edge device
 publish an IoT Edge module to an Azure Container Registry
Configure an IoT Edge device
 select and deploy an appropriate gateway pattern
 implement Industrial IoT solutions with modules like Modbus and OPC
 implement module-to-module communication
 implement and configure offline support (including local storage)
Process and manage data (15-20%)
Configure routing in Azure IoT Hub
 implement message enrichment in IoT Hub
 configure routing of IoT Device messages to endpoints
 define and test routing queries
 integrate with Event Grid
Configure stream processing
 create ASA for data and stream processing of IoT data
 process and filter IoT data by using Azure Functions
 configure Stream Analytics outputs
Configure an IoT solution for Time Series Insights (TSI)
 implement solutions to handle telemetry and time-stamped data
 create an Azure Time Series Insights (TSI) environment
 connect the IoT Hub and the Time Series Insights (TSI)
Monitor, troubleshoot, and optimize IoT solutions (15-20%)
Configure health monitoring
 configure metrics in IoT Hub
 set up diagnostics logs for Azure IoT Hub
 query and visualize tracing by using Azure Monitor
 use Azure Policy definitions for IoT Hub
Troubleshoot device communication
 establish maintenance communication
 verify device telemetry is received by IoT Hub
 validate device twin properties, tags and direct methods
 troubleshoot device disconnects and connects
Perform end-to-end solution testing and diagnostics
 estimate the capacity required for each service in the solution
 conduct performance and stress testing
Implement security (15-20%)
Implement device authentication in the IoT Hub
 choose an appropriate form of authentication
 manage the X.509 certificates for a device
 manage the symmetric keys for a device
Implement device security by using DPS
 configure different attestation mechanisms with DPS
 generate and manage x.509 certificates for IoT Devices
 configure enrollment with x.509 certificates
 generate a TPM endorsements key for a device
 configure enrollment with symmetric keys
Implement Azure Security Center (ASC) for IoT
 enable ASC for IoT in Azure IoT Hub
 create security modules
 configure custom alerts

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Microsoft Azure IoT Developer
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Question: 167
Question Set 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 question, 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
Answer: A
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:
Question: 168
Testlet 1
Case Study
This is a case study. Case studies are not timed separately. You can use as much exam time as you would like to
complete each case . However, there may be additional case studies and sections on this exam. You must manage your
time to ensure that you are able to complete all questions included on this exam in the time provided.
To answer the questions included in a case study, you will need to reference information that is provided in the case
study. Case studies might contain exhibits and other resources that provide more information about the scenario that is
described in the case study. Each question is independent of the other question on this case study.
At the end of this case study, a review screen will appear. This screen allows you to review your answers and to make
changes before you move to the next sections of the exam. After you begin a new section, you cannot return to this
section.
To start the case study
To display the first question on this case study, click the Next button. Use the buttons in the left pane to explore the
content of the case study before you answer the questions. Clicking these buttons displays information such as
business requirements, existing environment, and problem statements. If the case study has an All Information tab,
note that the information displayed is identical to the information displayed on the subsequent tabs. When you are
ready to answer a question, click the Question button to return to the question.
Existing Environment. Current State of Development
Contoso produces a set of Bluetooth sensors that read the temperature and humidity. The sensors connect to IoT
gateway devices that relay the data.
All the IoT gateway devices connect to an Azure IoT hub named iothub1.
Existing Environment. Device Twin
You plan to implement device twins by using the following JSON sample.
Existing Environment. Azure Stream Analytics
Each room will have between three to five sensors that will generate readings that are sent to a single IoT gateway
device. The IoT gateway device will forward all the readings to iothub1 at intervals of between 10 and 60 seconds.
You plan to use a gateway pattern so that each IoT gateway device will have its own IoT Hub device identity.
You draft the following query, which is missing the GROUP BY clause.
SELECT
AVG(temperature),
System.TimeStamp() AS AsaTime
FROM
Iothub
You plan to use a 30-second period to calculate the average temperature reading of the sensors.
You plan to minimize latency between the condition reported by the sensors and the corresponding alert issued by the
Stream Analytics job.
Existing Environment. Device Messages
The IoT gateway devices will send messages that contain the following JSON data whenever the temperature exceeds
a specified threshold.
The level property will be used to route the messages to an Azure Service Bus queue endpoint named criticalep.
Existing Environment. Issues
You discover connectivity issues between the IoT gateway devices and iothub1, which cause IoT devices to lose
connectivity and messages.
Requirements. Planning Changes
Contoso plans to make the following changes:
� Use Stream Analytics to process and view data.
� Use Azure Time Series Insights to visualize data.
� Implement a system to sync device statuses and required settings.
� Add extra information to messages by using message enrichment.
� Create a notification system to send an alert if a condition exceeds a specified threshold.
� Implement a system to identify what causes the intermittent connection issues and lost messages.
Requirements. Technical Requirements
Contoso must meet the following requirements:
� Use the built-in functions of IoT Hub whenever possible.
� Minimize hardware and software costs whenever possible.
� Minimize administrative effort to provision devices at scale.
� Implement a system to trace message flow to and from iothub1.
� Minimize the amount of custom coding required to implement the planned changes.
� Prevent read operations from being negatively affected when you implement additional services.
HOTSPOT
You create a new IoT device named device1 on iothub1. Device1 has a primary key of Uihuih76hbHb.
How should you complete the device connection string? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
Answer:
Explanation:
Box 1: iothub1
The Azure IoT hub is named iothub1.
Box 2: azure-devices.net
The format of the device connection string looks like:
HostName={YourIoTHubName}.azure-
devices.net;DeviceId=MyNodeDevice;SharedAccessKey={YourSharedAccessKey}
Box 1: device1
Device1 has a primary key of Uihuih76hbHb.
Reference:
https://docs.microsoft.com/en-us/azure/iot-hub/quickstart-control-device-dotnet
Question: 169
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
Answer: D
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: 170
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 AP
C. From the Azure subscription, select the IoT hub, select Message routing, and then configure a route to storage.
D. From the Azure subscription, select the IoT hub, select File upload, and then configure a storage container.
E. Configure the device to use a GET request to ContosoHub.azure-devices.net/devices/ContosoDevice1/
files/notifications.
Answer: AC
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: 171
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 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
Answer: B
Explanation:
Reference:
https://docs.microsoft.com/bs-latn-ba/azure/iot-dps/how-to-unprovision-devices
Question: 172
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 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: You delete the enrollment group from the Device Provisioning Service.
Does the solution meet the goal?
A. Yes
B. No
Answer: B
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: 173
HOTSPOT
You have an Azure IoT hub.
You plan to deploy 1,000 IoT devices by using automatic device management.
The device twin is shown below.
You need to configure automatic device management for the deployment.
Which target Condition and Device Twin Path should you use? To answer, select the appropriate options in the answer
area. NOTE: Each correct selection is worth one point.
Answer:
Explanation:
Box 1: tags.engine.warpDriveType=�VM105a�
Use tags to target twins. Before you create a configuration, you must specify which devices or modules you want to
affect. Azure IoT Hub identifies devices and using tags in the device twin, and identifies modules using tags in the
module twin.
Box 2: properties.desired.warpOperating
The twin path, which is the path to the JSON section within the twin desired properties that will be set.
For example, you could set the twin path to properties.desired.chiller-water and then provide the following JSON
content:
{
"temperature": 66,
"pressure": 28
}
Reference:
https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-automatic-device-management
Question: 174
Question Set 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 question, 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
Answer: A
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:
Question: 175
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
Answer: D
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: 176
DRAG DROP
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.
Answer:
Explanation:
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
Question: 177
Question Set 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 question, 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
Answer: A
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:
Question: 178
DRAG DROP
You have an Azure IoT hub.
You plan to attach three types of IoT devices as shown in the following table.
You need to select the appropriate communication protocol for each device.
What should you select? To answer, drag the appropriate protocols to the correct devices. Each protocol may be used
once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.
NOTE: Each correct selection is worth one point.
Answer:
Explanation:
Box 1: AMQP
Use AMQP on field and cloud gateways to take advantage of connection multiplexing across devices.
Box 2: MQTT
MQTT is used on all devices that do not require to connect multiple devices (each with its own per-device credentials)
over the same TLS connection.
Box 3: HTTPS
Use HTTPS for devices that cannot support other protocols.
Reference:
https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-protocols

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