A financial application processes stock trades. It is critical that trade messages are processed exactly once and in the exact order they were generated. Which messaging service meets these requirements?

Answer options:

Amazon SQS Standard queue

Amazon SNS

Amazon SQS FIFO queue

Amazon EventBridge

How to approach this question

Keywords: 'exactly once' and 'exact order'. This strictly requires SQS FIFO.

Full Answer

C.Amazon SQS FIFO queue✓ Correct

Amazon SQS FIFO (First-In-First-Out) queues are designed to enhance messaging between applications when the order of operations and events is critical, or where duplicates can't be tolerated (exactly-once processing).

Common mistakes

Selecting SQS Standard, which can deliver messages out of order or duplicate them.

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