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Choose the best response for each of the following questions. Then select Check your answers.

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1.

Which of the following are the most common reasons that devices disconnect from IoT Hub?

Network interruption, renewed X.509 certificate, communication throttling, DDoS attack.

Expired SAS token or X.509 certificate, network interruption, service interruption, service reconfiguration.

Service interruption, network interruption, failed device firmware update, invalid arguments passed to the callback of the send operation.

2.

Which Azure service can provide monitoring notifications for specific devices?

Azure Monitor

Event Grid

3.

A developer is writing code that implements the device connection "retry" pattern. The first step in the code is to detect an error. What is the next step in the process that the code should implement?

Retry according to the specified retry policy.

Filter by error type and decide if a retry is needed.

Determine whether the error is an unrecoverable error.

4.

What are the three retry policies that are supported by the IoT SDKs?

Scheduled retry, Custom retry, No retry

Exponential back-off, Custom back-off, No retry

Exponential back-off, Custom retry, No retry

5.

Which of the following choices is a common area to analyze first when device messages aren't being routed as expected?

Router logs.

The routing metrics for this endpoint.

The fallback route is disabled.

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