Microsoft Microsoft Certifications AZ-220 Questions & Answers

• Question 91:

  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

  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/

• Question 92:

  You are troubleshooting an Azure IoT hub.

  You discover that some telemetry messages are dropped before they reach downstream processing.

  You suspect that IoT Hub throttling is the root cause.

  Which log in the Diagnostics settings of the IoT hub should you use to capture the throttling error events?

  A. Routes

  B. DeviceTelemetry

  C. Connections

  D. C2DCommands

  Correct Answer: B

  The device telemetry category tracks errors that occur at the IoT hub and are related to the telemetry pipeline. This category includes errors that occur when sending telemetry events (such as throttling) and receiving telemetry events (such as unauthorized reader). This category cannot catch errors caused by code running on the device itself.

  Note: The metric d2c.telemetry.ingress.sendThrottle is the number of throttling errors due to device throughput throttles.

  Reference: https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-monitor-resource-health

• Question 93:

  You have 10 IoT devices that connect to an Azure IoT hub named Hub1.

  From Azure Cloud Shell, you run az iot hub monitor-events --hub-name Hub1 and receive the following error message: "az iot hub: 'monitor-events' is not in the 'az iot hub' command group. See 'az iot hub --help'."

  You need to ensure that you can run the command successfully.

  What should you run first?

  A. az iot hub monitor-feedback --hub-name Hub1

  B. az iot hub generate-sas-token --hub-name Hub1

  C. az iot hub configuration list --hub-name Hub1

  D. az extension add -name azure-cli-iot-ext

  Correct Answer: D

  Execute az extension add --name azure-cli-iot-ext once and try again.

  In order to read the telemetry from your hub by CLI, you have to enable IoT Extension with the following commands: Add: az extension add --name azure-cli-iot-ext

  Reference: https://github.com/MicrosoftDocs/azure-docs/issues/20843

• Question 94:

  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.

  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/

• Question 95:

  You have an Azure Stream Analytics job that receives input from an Azure IoT hub and sends the outputs to Azure Blob storage. The job has compatibility level 1.1 and six streaming units. You have the following query for the job.

  

  You plan to increase the streaming unit count to 12.

  You need to optimize the job to take advantage of the additional streaming units and increase the throughput.

  Solution: You change the query to the following.

  

  Does this meet the goal?

  A. Yes

  B. No

  Correct Answer: B

  Max number of Streaming Units with one step and with no partitions is 6.

  Reference: https://docs.microsoft.com/en-us/azure/stream-analytics/stream-analytics-parallelization

• Question 96:

  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 Stream Analytics job that receives input from an Azure IoT hub and sends the outputs to Azure Blob storage. The job has compatibility level 1.1 and six streaming units.

  You have the following query for the job.

  

  You plan to increase the streaming unit count to 12.

  You need to optimize the job to take advantage of the additional streaming units and increase the throughput.

  Solution: You change the compatibility level of the job to 1.2.

  Does this meet the goal?

  A. Yes

  B. No

  Correct Answer: B

  Max number of Streaming Units with one step and with no partitions is 6.

  Reference: https://docs.microsoft.com/en-us/azure/stream-analytics/stream-analytics-parallelization

• Question 97:

  You have an Azure IoT hub.

  You plan to implement IoT Hub events by using Azure Event Grid.

  You need to send an email when the following events occur:

  1.

  Device Created

  2.

  Device Deleted

  3.

  Device Connected

  4.

  Device Disconnected

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

  NOTE: Each correct selection is worth one point.

  A. From the IoT hub, configure an event subscription that has API management as the Endpoint Type.

  B. From the IoT hub, configure an event subscription that has Web Hook as the Endpoint Type.

  C. Create an Azure logic app that has a Request trigger.

  D. From the IoT hub, configure an event subscription that has Service Bus Queue as the Endpoint Type.

  Correct Answer: BC

  For non-telemetry events like DeviceConnected, DeviceDisconnected, DeviceCreated and DeviceDeleted, the Event Grid filtering can be used when creating the subscription.

  C: Azure Event Grid enables you to react to events in IoT Hub by triggering actions in your downstream business applications. A trigger, such as a Request trigger, is a specific event that starts your logic app.

  Reference: https://docs.microsoft.com/en-us/azure/event-grid/publish-iot-hub-events-to-logic-apps

• Question 98:

  You have an Azure Stream Analytics job that receives input from an Azure IoT hub and sends the outputs to Azure Blob storage. The job has compatibility level 1.1 and six streaming units. You have the following query for the job.

  

  You plan to increase the streaming unit count to 12.

  You need to optimize the job to take advantage of the additional streaming units and increase the throughput.

  Solution: You change the query to the following.

  

  Does this meet the goal?

  A. Yes

  B. No

  Correct Answer: A

  Max number of Streaming Units with one step and with no partitions is 6.

  Reference: https://docs.microsoft.com/en-us/azure/stream-analytics/stream-analytics-parallelization

• Question 99:

  You have 1,000 devices that connect to a standard tier Azure IoT hub.

  All the devices are commissioned and send telemetry events to the built-in IoT Hub endpoint.

  You configure message enrichment on the events endpoint and set the enrichment value to $twin.tags.ipV4.

  When you inspect messages on the events endpoint, you discover that all the messages are stamped with a string of "$twin.tags.ipV4".

  What are two possible causes of the issue? Each correct answer presents a complete solution.

  NOTE: Each correct selection is worth one point.

  A. The ipV4 tag is a restricted twin property that is unavailable for message enrichment.

  B. A standard tier IoT hub does not support device twin properties in message enrichments.

  C. The device sending the message has no device twin.

  D. Message enrichment cannot be added to messages going to a built-in endpoint.

  E. The device twin path used for the value of the enrichment does not exist.

  F. The device twin property value used for message enrichment is set to "$twin.tags.ipV4".

  Correct Answer: CE

  In some cases, if you are applying an enrichment with a value set to a tag or property in the device twin, the value will be stamped as a string value. For example, if an enrichment value is set to $twin.tags.field, the messages will be stamped with the string "$twin.tags.field" rather than the value of that field from the twin. This happens in the following cases:

  (C)

  Your IoT Hub is in the standard tier, but the device sending the message has no device twin.

  (E)

  Your IoT Hub is in the standard tier, but the device twin path used for the value of the enrichment does not exist. For example, if the enrichment value is set to $twin.tags.location, and the device twin does not have a location property under

  tags, the message is stamped with the string "$twin.tags.location".

  Your IoT Hub is in the basic tier. Basic tier IoT hubs do not support device twins.

  Reference:

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

• Question 100:

  You have the devices shown in the following table.

  

  You are implementing a proof of concept (POC) for an Azure IoT solution.

  You need to deploy an Azure IoT Edge device as part of the POC.

  On which two devices can you deploy IOT Edge? Each correct answer presents a complete solution.

  NOTE: Each correct selection is worth one point.

  A. Device1

  B. Device2

  C. Device3

  D. Device4

  Correct Answer: BC

  Azure IoT Edge runs great on devices as small as a Raspberry Pi3 to server grade hardware.

  Tier 1.

  The systems listed in the following table are supported by Microsoft, either generally available or in public preview, and are tested with each new release.

  

  Reference: https://docs.microsoft.com/en-us/azure/iot-edge/support