Exam AZ-220 topic 2 question 15 discussion

I think the answer should be D? It requires dps to allocate devices based on the registration ID of the device and the geographic location of the device. And also the load-balance should be made. But the static configuration can not achieve this requirement. The logic can be written in the Azure Function. So I think answer is D.

answer should be D. it require to base registration id and geographic location to assign device to IoT hub. It only can be done by Customised Function App.

"Static configuration: devices are provisioned to a single IoT hub, which must be specified on the enrollment." So Answer should be D. https://learn.microsoft.com/en-us/azure/iot-dps/how-to-use-allocation-policies#understand-allocation-policies

"Custom (Use Azure Function)" allocation policy option. This option allows you to use a custom Azure Function to dynamically allocate devices to IoT hubs based on your specific criteria, including the device's registration ID and geographic location. You can write a function that takes the device's metadata as input and returns the IoT hub endpoint that the device should be provisioned to. This enables you to apply more complex allocation logic beyond the standard allocation policy options provided by Azure IoT Hub. Using the custom allocation policy, you can implement a load balancing strategy that distributes devices evenly between IoT hubs in the same geographic location, based on the current load and availability of each hub. This can help ensure that the devices are distributed efficiently and prevent overloading of any particular IoT hub. Therefore, the correct answer is option D: Custom (Use Azure Function).

why not Evenly weighted distribution?

Only way to include ID in allocation logic is with a custom Function.

IMO answer should be D

I see Static configuration is not wrong, it works!

“ This article demonstrates a custom allocation policy using an Azure Function written in C#. Two new IoT hubs are created representing a Contoso Toasters Division and a Contoso Heat Pumps Division. Devices requesting provisioning must have a registration ID with one of the following suffixes to be accepted for provisioning: -contoso-tstrsd-007: Contoso Toasters Division -contoso-hpsd-088: Contoso Heat Pumps Division The devices will be provisioned based on one of these required suffixes on the registration ID.” https://docs.microsoft.com/en-us/azure/iot-dps/how-to-use-custom-allocation-policies?tabs=windows

D looks ok: https://docs.microsoft.com/en-us/azure/iot-dps/how-to-use-custom-allocation-policies?tabs=windows

It states "The load between the IoT hubs in the same geographic location must be balanced." If geographic location is the same, I suppose that the latency is also the same. Why not select "Evenly weighted distribution"?

It states "The load between the IoT hubs in the same geographic location must be balanced." This would not be the case when using lowest latency. So I would choose A.

I think should be the answer B: Lowest Latency to cover the requirement about geographic location