DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 building a microservices application that processes event messages from multiple sources. The application requires at-least-once delivery, but message ordering is not important. Which Amazon SQS queue type should the developer use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Standard queues offer at-least-once delivery and high throughput without ordering guarantees, fitting the requirement.
B
FIFO queue
Why wrong: FIFO queues guarantee strict ordering and exactly-once processing, but they have lower throughput and ordering is not needed here.
C
Dead-letter queue
Why wrong: A dead-letter queue is used to store messages that cannot be processed successfully, not as the primary queue for processing.
D
Delay queue
Why wrong: A delay queue is a feature applied to either Standard or FIFO queues to make messages initially invisible; it is not a different queue type.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Standard queue
Amazon SQS Standard queues provide at-least-once delivery and best-effort ordering, making them ideal for microservices that can tolerate duplicate messages and do not require strict message sequencing. Since the application processes events from multiple sources and message ordering is not important, a Standard queue meets the requirements without the throughput limitations of FIFO queues.
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 this is correct
Standard queues offer at-least-once delivery and high throughput without ordering guarantees, fitting the requirement.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
FIFO queue
Why it's wrong here
FIFO queues guarantee strict ordering and exactly-once processing, but they have lower throughput and ordering is not needed here.
✗
Dead-letter queue
Why it's wrong here
A dead-letter queue is used to store messages that cannot be processed successfully, not as the primary queue for processing.
✗
Delay queue
Why it's wrong here
A delay queue is a feature applied to either Standard or FIFO queues to make messages initially invisible; it is not a different queue type.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the 'at-least-once' delivery requirement with the need for ordering, leading them to choose FIFO queues, but the question explicitly states ordering is not important, making Standard queues the correct and more performant choice.
Detailed technical explanation
How to think about this question
Standard queues use a distributed, eventually consistent architecture where messages are replicated across multiple servers and Availability Zones, enabling high throughput (virtually unlimited transactions per second). The at-least-once delivery guarantee means that in rare cases, a consumer may receive the same message more than once, so applications must be idempotent. Under the hood, SQS uses a short polling or long polling mechanism (ReceiveMessageWaitTimeSeconds up to 20 seconds) to reduce empty responses and costs.
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: Standard queue — Amazon SQS Standard queues provide at-least-once delivery and best-effort ordering, making them ideal for microservices that can tolerate duplicate messages and do not require strict message sequencing. Since the application processes events from multiple sources and message ordering is not important, a Standard queue meets the requirements without the throughput limitations of FIFO queues.
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.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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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