DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A developer is creating an AWS Lambda function to process events from an Amazon SQS queue. The function must process each message exactly once and in order. Which SQS queue type should the developer use?
Why wrong: Standard queues deliver messages at least once and may deliver out of order. They do not guarantee exactly-once processing.
B
FIFO queue.
Correct. FIFO queues provide first-in-first-out delivery and exactly-once processing, satisfying the requirements.
C
Dead-letter queue.
Why wrong: A dead-letter queue is a separate queue used to store messages that fail processing. It is not a primary queue type.
D
Delay queue.
Why wrong: A delay queue is a feature that makes messages initially invisible for a set period, not a distinct queue type. It does not provide ordering or deduplication.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
FIFO queue.
The correct answer is B, FIFO queue. FIFO (First-In-First-Out) queues guarantee exactly-once processing and preserve the order of messages, which is required by the use case. Standard queues offer at-least-once delivery and do not guarantee order, making them unsuitable for this requirement.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Standard queue.
Why it's wrong here
Standard queues deliver messages at least once and may deliver out of order. They do not guarantee exactly-once processing.
✓
FIFO queue.
Why this is correct
Correct. FIFO queues provide first-in-first-out delivery and exactly-once processing, satisfying the requirements.
Related concept
Read the scenario before looking for a memorised answer.
✗
Dead-letter queue.
Why it's wrong here
A dead-letter queue is a separate queue used to store messages that fail processing. It is not a primary queue type.
✗
Delay queue.
Why it's wrong here
A delay queue is a feature that makes messages initially invisible for a set period, not a distinct queue type. It does not provide ordering or deduplication.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the 'exactly-once' and 'in-order' requirements with Standard queues, assuming they can achieve this with idempotent processing, but Standard queues explicitly do not guarantee order and can deliver duplicates.
Detailed technical explanation
How to think about this question
FIFO queues use a unique deduplication ID and message group ID to enforce exactly-once processing and strict ordering within a group. Under the hood, SQS FIFO queues use a distributed consensus mechanism to ensure that messages are not duplicated and are delivered in the exact order they were sent, which is critical for applications like financial transactions or inventory updates where sequence matters.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: FIFO queue. — The correct answer is B, FIFO queue. FIFO (First-In-First-Out) queues guarantee exactly-once processing and preserve the order of messages, which is required by the use case. Standard queues offer at-least-once delivery and do not guarantee order, making them unsuitable for this requirement.
What should I do if I get this DVA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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