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Exam2pass > Microsoft > Microsoft Certifications > AZ-220 > AZ-220 Online Practice Questions and Answers

AZ-220 Online Practice Questions and Answers

Questions 4

You have an Azure IoT solution that includes an Azure IoT hub and 100 Azure IoT Edge devices.

You plan to deploy the IoT Edge devices to external networks. The firewalls of the external networks only allow traffic on port 80 and port 443.

You need to ensure that the devices can connect to the IoT hub. The solution must minimize costs.

What should you do?

A. Configure the upstream protocol of the devices to use MQTT over TCP.

B. Configure the upstream protocol of the devices to use MQTT over WebSocket.

C. Connect the external networks to the IoT solution by using ExpressRoute.

D. Integrate cellular communication hardware onto the devices and avoid the use of the external networks.

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Correct Answer: B

MQTT over WebSockets uses port 443.

Note: Devices can communicate with IoT Hub in Azure using various protocols. Typically, the choice of protocol is driven by the specific requirements of the solution. The following table lists the outbound ports that must be open for a device to

be able to use a specific protocol:

Incorrect Answers:

A: MQTT over TCP uses port 883.

C: ExpressRoute uses BGP, which uses TCP port 179.

D: HTTPS proxy also uses port 443, but it would be a more expensive solution.

Reference: https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-protocols

Questions 5

You have 100 devices that connect to an Azure IoT hub.

You plan to use Azure functions to process all the telemetry messages from the devices before storing the messages.

You need to configure the functions binding for the IoT hub.

Which two configuration details should you use to configure the binding? Each correct answer presents part of the solution.

NOTE: Each correct selection is worth one point.

A. the name of the resource group that contains the IoT hub

B. the IoT hub's connection string shared access key that has Service connect permissions

C. the connection string of the Azure Event Hub-compatible endpoint from the IoT Hub built-in endpoints

D. the Azure Event-Hub compatible name

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Correct Answer: CD

EventHubName: Functions 2.x and higher. The name of the event hub. When the event hub name is also present in the connection string, that value overrides this property at runtime.

Connection: The name of an app setting that contains the connection string to the event hub's namespace. Copy this connection string by clicking the Connection Information button for the namespace, not the event hub itself. This connection string must have send permissions to send the message to the event stream.

Reference: https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-event-iot-output

Questions 6

You have an Azure Stream Analytics job that connects to an Azure IoT hub named Hub1445 as a streaming data source. Hub1445 is configured as shown in the exhibit.

The Stream Analytics job fails to receive any messages from the IoT hub. What should you do to resolve the issue?

A. Change the Route1 route query to true.

B. Enable the Route3 route.

C. Disable the Route2 route.

D. Enable the fallback route.

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Correct Answer: B

The device telemetry is usually passed as JSON from the device through the IoT Hub - this is handled nicely by Azure Streaming Analytics queries. The IoT Hub message routing should be configured as follows: Data source: Device Telemetry Messages Routing query: true (as the routing query is an expression that evaluates to true or false for each received message, the simplest way to send all messages to the endpoint is to just supply true as the query).

Reference: https://darenmay.com/blog/azure-iot-streaming-analytics-data-lake-analytics-and-json/

Questions 7

You have an Azure IoT solution that includes a standard tier Azure IoT hub and an IoT device.

The device sends one 100-KB device-to-cloud message every hour.

You need to calculate the total daily message consumption of the device.

What is the total daily message consumption of the device?

A. 24

B. 600

C. 2,400

D. 4,800

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Correct Answer: B

100 KB * 24 is around 2,400 bytes.

The 100 KB message is divided into 4 KB blocks, and it is billed for 25 messages. 25 times 24 is 600

Note: The maximum message size for messages sent from a device to the cloud is 256 KB. These messages are metered in 4 KB blocks for the paid tiers so for instance if the device sends a 16 KB message via the paid tiers it will be billed

as 4 messages.

Reference:

https://azure.microsoft.com/en-us/pricing/details/iot-hub/

Questions 8

You have an Azure IoT solution that includes several Azure IoT hubs.

A new alerting feature was recently added to the IoT devices. The feature uses a new device twin reported property named alertCondition.

You need to send alerts to an Azure Service Bus queue named MessageAlerts. The alerts must include alertCondition and the name of 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. Configure File upload for each IoT hub. Configure the device to send a file to an Azure Storage container that contains the device name and status message.

B. Add the following message enrichments: Name = iotHubName Value = $twin.tag.location Endpoint = MessageAlerts

C. Create an IoT Hub routing rule that has a data source of Device Twin Change Events and select the endpoint for MessageAlerts.

D. Add the following message enrichments: Name = iotHubName Value = $iothubname Endpoint = MessageAlerts

E. Create an IoT Hub routing rule that has a data source of Device Telemetry Messages and select the endpoint for MessageAlerts.

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Correct Answer: BD

B: Message enrichments is the ability of the IoT Hub to stamp messages with additional information before the messages are sent to the designated endpoint. One reason to use message enrichments is to include data that can be used to simplify downstream processing. For example, enriching device telemetry messages with a device twin tag can reduce load on customers to make device twin API calls for this information.

D: Applying enrichments The messages can come from any data source supported by IoT Hub message routing, including the following examples: -->device twin change notifications -- changes in the device twin device telemetry, such as temperature or pressure device life-cycle events, such as when the device is created or deleted

Reference: https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-message-enrichments-overview

Questions 9

You have an Azure IoT hub that has a hostname of contoso-hub.azure-devices.net and an MCU-based IoT device named Device1. Device1 does NOT support Azure IoT SDKs.

You plan to connect Device1 to the IoT hub by using the Message Queuing Telemetry Transport (MQTT) protocol and to authenticate by using X.509 certificates.

You need to ensure that Device1 can authenticate to the IoT hub.

What should you do?

A. Create an Azure key vault and enable the encryption of data at rest for the IoT hub by using a customer-managed key.

B. Enable a hardware security module (HSM) on Device1.

C. From the Azure portal, create an IoT Hub Device Provisioning Service (DPS) instance and add a certificate enrollment for Device1.

D. Add the DigiCert Baltimore Root Certificate to Device1.

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Correct Answer: D

The connection to Azure IoT Hub with MQTT is secured using TLS.

The Azure IoT Hub library requires the provisioning of the following certificates and a private key for a successful TLS connection:

1.

Baltimore CyberTrust Root certificate - Server certificate, used to verify the server's certificate while connecting.

2.

Device certificate - generated by the procedures described in Creating Azure IoT Hub certificates , used by Azure IoT Hub to authenticate the device.

3.

Private key of the device.

Reference: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/include/net/azure_iot_hub.html

Questions 10

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 connecting to the IoT hub.

Solution: You disconnect the Device Provisioning Service from the IoT hub.

Does this meet the goal?

A. Yes

B. No

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Correct Answer: B

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

Questions 11

You have an Azure subscription that contains the resources shown in the following table.

You create a group enrollment in DPS1 and enroll 100 loT devices. Each device is issued a leaf certificate from CAT.

You need to deprovision a single loT device from the group enrollment.

The solution must not affect the other devices.

Solution: You delete the device entry from the device registry of Hub1.

Does this meet the goal?

A. Yes

B. No

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Correct Answer: B

Questions 12

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)

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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

Questions 13

HOTSPOT

You create an Azure Stream Analytics job that has the following query.

The job is configured to have an Azure IoT Hub input and an output to an Azure function.

For each of the following statements, select Yes if the statement is true. Otherwise, select No.

NOTE: Each correct selection is worth one point.

Hot Area:

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Correct Answer:

Exam Code: AZ-220
Exam Name: Microsoft Azure IoT Developer
Last Update: Mar 26, 2025
Questions: 193

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