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Exam AZ-220: Microsoft Azure IoT Developer: https://docs.microsoft.com/en-us/learn/certifications/exams/az-220

Candidates for this exam should have subject matter expertise developing cloud and edge components of an Azure IoT solution.

Responsibilities for an Azure IoT Developer include managing the device lifecycle–set up, configuration, and maintenance–using cloud services and other tools. You implement designs for Azure IoT solutions including device topology, connectivity, debugging, and security, as well as solutions to manage, monitor, and transform IoT-related data pipelines. You also deploy Azure IoT Edge components and configure device networking on the edge.

An Azure IoT Developer works with data engineers and other stakeholders to ensure successful business integration.

Skills measured

The content of this exam will be updated on May 28, 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%)

Latest Updates Microsoft AZ-220 Exam Practice Questions and Answers

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.fulldumps az-220 exam questions q1

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
NOTE: Each correct selection is worth one point.
Hot Area:

fulldumps az-220 exam questions q1-1

Correct Answer:

fulldumps az-220 exam questions q1-2

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
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
{ “temperature”: 66, “pressure”: 28
Reference: https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-automatic-device-management

You need to add Time Series Insights to the solution to meet the pilot requirements.
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.
Select and Place: fulldumps az-220 exam questions q2

Correct Answer:

fulldumps az-220 exam questions q2-1

Step 1: Provision Time Series Insights
Select Provision’s new IoT Hub to create a new IoT hub.
Step 2: Route telemetry from IoT Hub to a custom event.
Step 3: Add a data access policy to Time Series Insights for the dashboard web app
Scenario: Requirements. Pilot Requirements
During the pilot phase, devices will be deployed to 10 offices. Each office will have up to 1,000 devices.
During this phase, you will add Azure Time Series Insights in parallel to Stream Analytics to support real-time graphs
and queries in a dashboard web app.
The pilot deployment must minimize operating costs.
Incorrect Answers:
No need to use an endpoint.

During the POV phase, telemetry from IoT Hub stops flowing to the hot path. The cold path continues to work. What
should you do to restore the hot path?
A. Disable the fallback route.
B. Run the Test all routes action.
C. Create an explicit route for the hot path.
D. Modify cold-route to send only some telemetry data to the cold path.
Correct Answer: C

You have three Azure IoT hubs named Hub1, Hub2, and Hub3, a Device Provisioning Service instance, and an IoT device named Device1.
Each IoT hub is deployed to a separate Azure region.
Device enrollment uses the Lowest latency allocation policy.
The Device Provisioning Service uses the Lowest latency allocation policy.
Device1 is auto-provisioned to Hub1 by using the Device Provisioning Service.
Device1 regularly moves between regions.
You need to ensure that Device1 always connects to the IoT hub that has the lowest latency.
What should you do?
A. Configure device attestation that uses X.509 certificates.
B. Implement device certificate rolling.
C. Disenroll and reenroll Device1.
D. Configure the re-provisioning policy.
Correct Answer: D
Automated re-provisioning support.
Microsoft added first-class support for device re-provisioning which allows devices to be reassigned to a different IoT
solution sometime after the initial solution assignment. Re-provisioning support is available in two options:
Factory reset, in which the device twin data for the new IoT hub is populated from the enrollment list instead of the old
IoT hub. This is common for factory reset scenarios as well as leased device scenarios.
Migration, in which device twin data is moved from the old IoT hub to the new IoT hub. This is common for scenarios in
which a device is moving between geographies.

You need to configure Stream Analytics to meet the POV requirements.
What are the two ways to achieve the goal? Each correct answer presents a complete solution.
NOTE: Each correct selection is worth one point.
A. From IoT Hub, create a custom event hub endpoint, and then configure the endpoint as an input to Stream Analytics.
B. Create a Stream Analytics module, and then deploy the module to all IoT Edge devices in the fleet.
C. Create an input in Stream Analytics that uses the built-in events endpoint of IoT Hub as the source.
D. Route telemetry to an Azure Blob storage custom endpoint, and then configure the Blob storage as a reference input
for Stream Analytics.
Correct Answer: AC

You develop a custom Azure IoT Edge module named temperature-module.
You publish temperature-module to a private container registry named mycr.azurecr.io
You need to build a deployment manifest for the IoT Edge device that will run a temperature-module.
Which three container images should you define in the manifest? Each correct answer presents part of the solution.
NOTE: Each correct selection is worth one point.
A. mcr.microsoft.com/azureiotedge-simulated-temperature-sensor:1.0
B. mcr.microsoft.com/azureiotedge-agent:1.0
C. mcr.microsoft.com/iotedgedev:2.0
D. mycr.azurecr.io/temperature-module:latest
E. mcr.microsoft.com/azureiotedge-hub:1.0
Correct Answer: BDE
Each IoT Edge device runs at least two modules: $edgeAgent and $edgeHub, which are part of the IoT Edge runtime.
IoT Edge device can run multiple additional modules for any number of processes. Use a deployment manifest to tell
your device which modules to install and how to configure them to work together.
Reference: https://docs.microsoft.com/en-us/azure/iot-edge/module-composition

Your company is creating a new camera security system that will use Azure IoT Hub.
You plan to use an Azure IoT Edge device that will run Ubuntu Server 18.04.
You need to configure the IoT Edge 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.
Select and Place:fulldumps az-220 exam questions q7

Correct Answer:

fulldumps az-220 exam questions q7-1

Step 1: Run the following commands
Install the container runtime.
Azure IoT Edge relies on an OCI-compatible container runtime. For production scenarios, we recommended that you
use the Moby-based engine provided below. The Moby engine is the only container engine officially supported with
IoT Edge. Docker CE/EE container images are compatible with the Moby runtime.
Install the Moby engine.
sudo apt-get install moby-engine
Install the Moby command-line interface (CLI). The CLI is useful for development but optional for production
sudo apt-get installs moby-CLI install the security daemon. The package is installed at /etc/iotedge/.
sudo apt-get install IoT edge
Step 2: From IoT Hub, create an IoT Edge device registry entry.
Note: In your IoT Hub in the Azure portal, IoT Edge devices are created and managed separately from IoT devices that
are not edge enabled.
Sign in to the Azure portal and navigate to your IoT hub.
In the left pane, select IoT Edge from the menu.
Select Add an IoT Edge device.
Provide a descriptive device ID. Use the default settings to auto-generate authentication keys and connect the new
device to your hub.
Select Save.
Retrieve the connection string in the Azure portal
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.
From the IoT Edge page in the portal, click on the device ID from the list of IoT Edge devices.
Copy the value of either Primary Connection String or Secondary Connection String.
Step 3: Add the connection string to…
To manually provision a device, you need to provide it with a device connection string that you can create by registering
a new device in your IoT hub.
Open the configuration file.
sudo nano /etc/iotedge/config.yaml
Find the provisioning configurations of the file and uncomment the Manual provisioning configuration section. Update
the value of device_connection_string with the connection string from your IoT Edge device.
Save and close the file.
After entering the provisioning information in the configuration file, restart the daemon:
sudo systemctl restart IoT edge

You enable Azure Security Center for IoT.
You need to onboard a device to Azure Security Center.
What should you do?
A. Add the azureiotsecurity module identity to the Azure IoT Hub device identity.
B. Open incoming TCP port 8883 on the device.
C. Modify the connection string of the device.
D. Install an X.509 certificate on the hardware security module (HSM) of the device.
Correct Answer: A
Use the following workflow to deploy and test your Azure Security Center for IoT security agents:
Enable Azure Security Center for IoT service to your IoT Hub
If your IoT Hub has no registered devices, Register a new device.
Create an azureiotsecurity security module for your devices.
Azure Security Center for IoT makes use of the module twin mechanism and maintains a security module twin named
azureiotsecurity for each of your devices.
Note: To manually create a new azureiotsecurity module twin for a device using the following instructions:
In your IoT Hub, locate and select the device you wish to create a security module twin for.
Click on your device, and then on Add module identity.
In the Module Identity Name field, enter azureiotsecurity.
Click Save.
Reference: https://docs.microsoft.com/en-us/azure/asc-for-iot/quickstart-create-security-twin

You need to enable telemetry message tracing through the entire IoT solution. What should you do?
A. Monitor device lifecycle events.
B. Upload IoT device logs by using the File upload feature.
C. Enable the DeviceTelemetry diagnostic log and stream the log data to an Azure event hub.
D. Implement distributed tracing.
Correct Answer: D
IoT Hub is one of the first Azure services to support distributed tracing. As more Azure services support distributed
tracing, you\\’ll be able to trace IoT messages throughout the Azure services involved in your solution.
Enabling distributed tracing for IoT Hub gives you the ability to:
Precisely monitor the flow of each message through IoT Hub using trace context. This trace context includes correlation
IDs that allow you to correlate events from one component with events from another component. It can be applied for a
subset or all IoT device messages using device twin.
Automatically log the trace context to Azure Monitor diagnostic logs.
Measure and understand message flow and latency from devices to IoT Hub and routing endpoints.
Start considering how you want to implement distributed tracing for the non-Azure services in your IoT solution.

You use Azure Security Center in an Azure IoT solution.
You need to exclude some security events. The solution must minimize the development effort.
What should you do?
A. Create an Azure function to filter security messages.
B. Add a configuration to the code of the physical IoT device.
C. Add configuration details to the device twin object.
D. Create an azureiotsecurity module twin and add configuration details to the module twin object.
Correct Answer: D
Properties related to every Azure Security Center for IoT security agent are located in the agent configuration object,
within the desired properties section, of the azureiotsecurity module.
To modify the configuration, create and modify this object inside the azureiotsecurity module twin identity.
Note: Azure Security Center for IoT\\’s security agent twin configuration object is a JSON format object. The configuration object is a set of controllable properties that you can define to control the behavior of the agent.
These configurations help you customize the agent for each scenario required. For example, automatically excluding
some events, or keeping power consumption to a minimal level is possible by configuring these properties.

How should you complete the GROUP BY clause to meet the Streaming Analytics requirements?
A. GROUP BY HoppingWindow(Second, 60, 30)
B. GROUP BY TumblingWindow(Second, 30)
C. GROUP BY SlidingWindow(Second, 30)
D. GROUP BY SessionWindow(Second, 30, 60)
Correct Answer: B
Scenario: You plan to use a 30-second period to calculate the average temperature reading of the sensors.
Tumbling window functions are used to segment a data stream into distinct time segments and perform a function
against them, such as the example below. The key differentiators of a Tumbling window are that they repeat, do not
overlap, and an event cannot belong to more than one tumbling window.
Incorrect Answers:
A: Hopping window functions hop forward in time by a fixed period. It may be easy to think of them as Tumbling
windows that can overlap, so events can belong to more than one Hopping window result set.
Reference: https://docs.microsoft.com/en-us/azure/stream-analytics/stream-analytics-window-functions

You create an Azure IoT hub by running the following command.
az iot hub create –resource-group MyResourceGroup –name MyIotHub –sku B1 –location westus –partition-count 4
What does MylotHub support?
A. Device Provisioning Service
B. cloud-to-device messaging
C. Azure IoT Edge
D. device twins
Correct Answer: A
The Device Provisioning Service is included in the Basic Tiers (such as B1).
Incorrect Answers:
B, C, D: The Standard tier is needed for cloud-to-device messaging, Azure IoT Edge, and device twins.

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