解决方法：临时禁用Azure IoT设备连接

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"AZ-220微软MCP EN 关于Azure IoT解决方案的管理与设备预配服务" 在Azure IoT解决方案中，管理和维护设备连接至IoT Hub是非常关键的任务。AZ-220课程中提到了两个重要概念：Device Provisioning Service（DPS）和IoT Hub，它们是微软Azure IoT平台的核心组件。DPS负责设备的预先配置，而IoT Hub则作为中央接收和发送设备数据的中心。 1. 在问题1中，你有一个包含Azure IoT Hub、Device Provisioning Service实例以及1000个已连接的IoT设备的解决方案。所有设备都是通过一个注册组自动预配的。你需要临时禁用这些设备连接到IoT Hub。解决方案是：在Device Provisioning Service中禁用注册组，并在预配的IoT Hub的身份注册表中禁用设备条目。这个方案是否满足目标？ - 答案B：不满足。禁用DPS中的注册组将阻止新设备的预配，但不会影响已经预配并连接到IoT Hub的设备。要在IoT Hub层面禁用已连接设备，需要直接在IoT Hub的身份注册表中操作，但这不包括从DPS中禁用注册组。 2. 在问题2中，面对同样的需求，你选择删除Device Provisioning Service中的注册组。这个解决方案是否满足目标？ - 答案B：不满足。删除注册组不仅会阻止新设备的预配，还会影响已经通过该组预配的所有设备，可能导致这些设备无法再连接到IoT Hub。因此，这不是一个临时禁用已连接设备的适当方法。 3. 问题3中，情境与前两个类似，但未给出解决方案。要临时禁用已连接的1000个设备，正确的方法是直接在IoT Hub的身份注册表中禁用这些设备的条目。这样可以确保设备在不影响预配服务的情况下被暂时阻止连接到IoT Hub。 Azure IoT Hub的身份注册表是每个IoT Hub的一个关键特性，它存储了所有尝试连接到IoT Hub的设备的身份信息。通过禁用这里的设备条目，你可以控制哪些设备可以连接和通信，而不需要改变Device Provisioning Service的设置。此外，了解如何安全地管理设备生命周期，包括添加、删除和更新设备标识，以及处理设备状态的变化，对于任何Azure IoT解决方案的管理员来说都是至关重要的。DPS提供了基于设备证书或密钥的验证机制，以及灵活的预配策略，比如单个设备注册或设备组注册，以满足不同规模和安全需求的IoT部署。 AZ-220课程涵盖了Azure IoT Hub和Device Provisioning Service的深度操作，强调了在复杂物联网环境中有效管理设备连接和预配的重要性。理解这些概念和操作对于通过MCP认证以及在实际工作中成功实施和管理Azure IoT解决方案至关重要。

D. the hostname of the IoT hub

9. You have an Azure IoT hub that uses a Device Provisioning Service instance to automate the deployment of Azure

IoT Edge devices.

The IoT Edge devices have a Trusted Platform Module (TPM) 2.0 chip.

From the Azure portal, you plan to add an individual enrollment to the Device Provisioning Service that will use the

TPM of the IoT Edge devices as the attestation mechanism.

Which detail should you obtain before you can create the enrollment?

A. the scope ID and the Device Provisioning Service endpoint

B. the primary key of the Device Provisioning Service shared access policy and the global device endpoint

C. the X.509 device certificate and the certificate chain

D. the endorsement key and the registration ID

10. You have devices that connect to an Azure IoT hub. Each device has a fixed GPS location that includes latitude

and longitude.

You discover that a device entry in the identity registry of the IoT hub is missing the GPS location.

You need to configure the GPS location for the device entry. The solution must prevent the changes from being

propagated to the physical device.

Solution: You use an Azure policy to apply tags to a resource group.

Does the solution meet the goal?

A. Yes

B. No

11. You have devices that connect to an Azure IoT hub. Each device has a fixed GPS location that includes latitude

and longitude.

You discover that a device entry in the identity registry of the IoT hub is missing the GPS location.

You need to configure the GPS location for the device entry. The solution must prevent the changes from being

propagated to the physical device.

Solution: You add tags to the device twin.

Does the solution meet the goal?

A. Yes

B. No

12. You have an existing Azure IoT hub.

You use IoT Hub jobs to schedule long running tasks on connected devices.

Which two operations do the IoT Hub jobs support directly? Each correct answer presents a complete solution.

NOTE: Each correct selection is worth one point.

A. Trigger Azure functions.

B. Invoke direct methods.

C. Update desired properties.

D. Send cloud-to-device messages.

E. Disable IoT device registry entries.

13. You have 1,000 IoT devices that connect to an Azure IoT hub.

Each device has a property tag named city that is used to store the location of the device.

You need to update the properties on all the devices located at an office in the city of Seattle as quickly as possible.

Any new devices in the Seattle office that are added to the IoT hub must receive the updated properties also.

What should you do?

A. From Automatic Device Management, create an IoT device configuration.

B. From the IoT hub, generate a query for the target devices.

C. Create a scheduled job by using the IoT Hub service SDKs.

D. Deploy an Azure IoT Edge transparent gateway to the Seattle office and deploy an Azure Stream Analytics edge

job.

14. You have an Azure IoT Central application.

You add an IoT device named Oven1 to the application. Oven1 uses an IoT Central template for industrial ovens.

You need to send an email to the managers group at your company as soon as the oven temperature falls below 400

degrees.

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

NOTE: Each correct selection is worth one point.

A. Create a SendGrid account in the same resource group as the IoT Central application.

B. Add a condition that has Time Aggregation set to Off.

C. Add a condition that has Aggregation set to Minimum.

D. Add the Manager role to the IoT Central application.

E. From IoT Central, create a telemetry rule for the template.

15. You have an Azure IoT solution that includes multiple Azure IoT hubs in different geographic locations and a

single Device Provision Service instance.

You need to configure device enrollment to assign devices to the appropriate IoT hub based on the following

requirements:

✑ The registration ID of the device

The geographic location of the device

The load between the IoT hubs in the same geographic location must be balanced.

What should you use to assign the devices to the IoT hubs?

A. Static configuration (via enrollment list only)

B. Lowest latency

C. Evenly weighted distribution

D. Custom (Use Azure Function)

16. You are developing an Azure IoT Central application.

You add a new custom device template to the application.

You need to add a fixed location value to the device template. The value must be updated by the physical IoT device,

read-only to device operators, and not graphed by IoT Central.

What should you add to the device template?

A. a Location property

B. a Location telemetry

C. a Cloud property

17. You have an Azure IoT solution that includes an Azure IoT hub, a Device Provisioning Service instance, and 1,000

connected IoT devices. The IoT devices are allocated to four enrollment groups. Each enrollment group is configured

to use certificate attestation.

You need to decommission all the devices in a single enrollment group and the enrollment group itself.

Which three actions should you perform in sequence?

Delete each device from the identity registry.

Delete the IoT hub.

Remove the X.509 root certificate.

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解决方法：临时禁用Azure IoT设备连接

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