Exam AZ-220 topic 3 question 12 discussion

Actual exam question from Microsoft's AZ-220

Question #: 12
Topic #: 3

HOTSPOT -
You have an Azure subscription that contains an Azure IoT hub, an Azure IoT Edge gateway, and 1,000 leaf devices. The leaf devices use a custom communication protocol that is NOT supported by the IoT hub.
You need to configure the gateway to meet the following requirements:
✑ Minimize the number of connections between the gateway and the IoT hub.
✑ Support addressing cloud-to-device messages to individual leaf devices.
How should you configure the gateway? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
Hot Area:

Show Suggested Answer

Suggested Answer:

Box 1: Protocol translation -
In the protocol translation gateway pattern, only the IoT Edge gateway has an identity with IoT Hub. The translation module receives messages from downstream devices, translates them into a supported protocol, and then the IoT Edge device sends the messages on behalf of the downstream devices.
Box 2: Advanced MessageQueuing Protocol (AMQP)
Connection multiplexing - All devices connecting to IoT Hub through an IoT Edge gateway can use the same underlying connection. This multiplexing capability requires that the IoT Edge gateway uses AMQP as its upstream protocol.
Reference:
https://docs.microsoft.com/en-us/azure/iot-edge/iot-edge-as-gateway

by d0bermannn at Dec. 31, 2021, 10:24 a.m.

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kohmaksimka

Highly Voted 3 years, 5 months ago

Should be: Identity translation: Support addressing cloud-to-device messages (https://docs.microsoft.com/en-us/azure/iot-edge/iot-edge-as-gateway?view=iotedge-2020-11#device-capabilities-behind-translation-gateways). Identity translation is built upon protocol translation AMQP: Minimize number of connections

upvoted 17 times

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j_c_000

Most Recent 2 years, 1 month ago

Identity translation. "The cloud can address each connected device individually" in this case.

upvoted 1 times

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IMARRA

2 years, 11 months ago

how to 'Minimize the number of connections between the gateway and the IoT hub'?

upvoted 1 times

lah123

2 years, 7 months ago

by using AMQP

upvoted 1 times

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liberty123

3 years, 4 months ago

Identity translation AMQP

upvoted 3 times

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d0bermannn

3 years, 6 months ago

looks ok like amqp over nat)

upvoted 1 times

d0bermannn

3 years, 6 months ago

but for the cloud can address each connected device individually in box1 must be Identity translation

upvoted 1 times

TechieBloke

3 years, 5 months ago

Wrong! Look at the link: https://docs.microsoft.com/en-us/azure/iot-edge/iot-edge-as-gateway?view=iotedge-2020-11 With identity translation there are many logical connections. Given ans correct.

upvoted 1 times

d0bermannn

3 years, 5 months ago

No way, must be id.translation. In question we have reqs. ' Support addressing cloud-to-device messages to individual leaf devices' and nice link about edge gw said that - protocol translation supports only 'The cloud can only address the gateway device' - id. translation supports 'The cloud can address each connected device individually', i.e. exactly the reqs.

upvoted 4 times

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