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Microsoft Azure IoT Developer Sample Questions (Q133-Q138):

NEW QUESTION # 133
You have an loT solution that includes an Azure IoT hub named Hub1 and 20 loT devices. Hub1 sends cloud-to-device messages to the 10T devices.
You need to track the number of messages that are resubmitted for delivery to an IoT device. Which metric should you monitor?

  • A. C2D messages rejected
  • B. C2D messages abandoned
  • C. C2D message deliveries completed
  • D. C2D Messages Expired

Answer: B


NEW QUESTION # 134
You have an Azure IoT hub that uses a Device Provision Service instance.
You plan to deploy 100 IoT devices.
You need to confirm the identity of the devices by using the Device Provision Service.
Which three device attestation mechanisms can you use? Each correct answer presents a complete solution.
NOTE: Each correct selection is worth one point.

  • A. X.509 certificates
  • B. Trusted Platform Module (TPM) 2.0
  • C. Device Identity Composition Engine (DICE)
  • D. Symmetric key
  • E. Trusted Platform Module (TPM) 1.2

Answer: A,B,D

Explanation:
The Device Provisioning Service supports the following forms of attestation:
* X.509 certificates based on the standard X.509 certificate authentication flow.
* Trusted Platform Module (TPM) based on a nonce challenge, using the TPM 2.0 standard for keys to present a signed Shared Access Signature (SAS) token. This does not require a physical TPM on the device, but the service expects to attest using the endorsement key per the TPM spec.
* Symmetric Key based on shared access signature (SAS) Security tokens, which include a hashed signature and an embedded expiration.
Reference:
https://docs.microsoft.com/en-us/azure/iot-dps/concepts-service#attestation-mechanism


NEW QUESTION # 135
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. Implement device certificate rolling.
  • B. Disenroll and reenroll Device1.
  • C. Configure device attestation that uses X.509 certificates.
  • D. Configure the re-provisioning policy.

Answer: D

Explanation:
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.
Reference:
https://azure.microsoft.com/en-us/blog/new-year-newly-available-iot-hub-device-provisioning-service-features/


NEW QUESTION # 136
You have an Azure IoT hub that uses a Device Provisioning Service instance.
You have 1,000 legacy IoT devices that only support MAC address or serial number identities. The device do NOT have a security feature that can be used to securely identify the device or a hardware security module (HSM).
You plan to deploy the devices to a secure environment.
You need to configure the Device Provisioning Service instance to ensure that all the devices are identified securely before they receive updates.
Which attestation mechanism should you choose?

  • A. Trusted Platform Module (TPM) 1.2 attestation
  • B. X.509 certificates
  • C. symmetric key attestation

Answer: C

Explanation:
Explanation
A common problem with many legacy devices is that they often have an identity that is composed of a single piece of information. This identity information is usually a MAC address or a serial number. Legacy devices may not have a certificate, TPM, or any other security feature that can be used to securely identify the device.
The Device Provisioning Service for IoT hub includes symmetric key attestation. Symmetric key attestation can be used to identify a device based off information like the MAC address or a serial number.
Reference:
https://docs.microsoft.com/bs-latn-ba/azure/iot-dps/how-to-legacy-device-symm-key


NEW QUESTION # 137
What should you do to identify the cause of the connectivity issues?

  • A. Send cloud-to-device messages to the IoT devices.
  • B. Enable the collection of the Connections diagnostics logs and set up alerts for the connected devices count metric.
  • C. Monitor the connection status of the device twin by using an Azure function.
  • D. Use the heartbeat pattern to send messages from the IoT devices to iothub1.

Answer: B

Explanation:
Scenario: You discover connectivity issues between the IoT gateway devices and iothub1, which cause IoT devices to lose connectivity and messages.
To log device connection events and errors, turn on diagnostics for IoT Hub. We recommend turning on these logs as early as possible, because if diagnostic logs aren't enabled, when device disconnects occur, you won't have any information to troubleshoot the problem with.
Step 1:
1. Sign in to the Azure portal.
2. Browse to your IoT hub.
3. Select Diagnostics settings.
4. Select Turn on diagnostics.
5. Enable Connections logs to be collected.
6. For easier analysis, turn on Send to Log Analytics (see pricing).
Step 2:
Set up alerts for device disconnect at scale
To get alerts when devices disconnect, configure alerts on the Connected devices (preview) metric.
Reference:
https://docs.microsoft.com/bs-cyrl-ba/azure/iot-hub/iot-hub-troubleshoot-connectivity


NEW QUESTION # 138
......

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