A developer is building an application that invokes AWS Lambda functions asynchronously to process events. The developer notices that a Lambda function fails to process some events at random times. Th

Question

Options

• AAdd an Amazon EventBridge rule for the Lambda function. Configure the EventBridge rule to
• BConfigure the Lambda function with a dead-letter queue based in Amazon Kinesis. Update the
• CConfigure the Lambda function with an Amazon Simple Queue Service (Amazon SQS) dead-
• DConfigure the Lambda function with an Amazon Simple Queue Service (Amazon SQS) FIFO

• A
  8% (3)
• B
  71% (27)
• C
  5% (2)
• D
  16% (6)

Explanation

There appears to be an error in the provided answer key - option B as written (Kinesis as a dead-letter queue) is incorrect per AWS documentation. Lambda's DLQ feature only supports Amazon SQS and Amazon SNS as destinations; Kinesis cannot be configured as a Lambda DLQ.

The correct answer is C - configuring the Lambda function with an SQS dead-letter queue (DLQ). When an async Lambda invocation fails after retries (default: 2 attempts), the failed event payload is automatically routed to the configured SQS DLQ, preserving it for investigation and reprocessing.

Why the others are wrong:

• A (EventBridge rule): EventBridge can trigger Lambda but cannot natively capture and preserve payloads of failed Lambda invocations for debugging.
• B (Kinesis DLQ): Kinesis is not a supported DLQ destination for Lambda - this option is invalid.
• D (SQS FIFO queue): FIFO queues enforce ordering and deduplication, which are unnecessary requirements here. Standard SQS queues are the correct DLQ type.

Memory tip: Think "Dead Letters go to the Post Office (SQS/SNS)" - failed async Lambda events need a holding place (SQS) where you can pick them up later, just like undeliverable mail at a post office. Kinesis is a streaming service, not a message holding destination.

Double-check the source of this practice question - the answer key may have a typo (B vs. C).

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