- A
Amazon SNS
Why wrong: SNS is a pub/sub notification service used for fan-out messaging, not a persistent queue with at-least-once delivery guarantees.
- B
Amazon SQS
SQS provides managed message queuing with at-least-once delivery for standard queues and up to 14-day message retention.
- C
Amazon Kinesis Data Streams
Why wrong: Kinesis is designed for real-time streaming data pipelines, not general-purpose message queuing.
- D
AWS Step Functions
Why wrong: Step Functions orchestrates workflows, it does not serve as a message queue.
Question 716 of 1,024
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and 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 company needs a managed message queue service that guarantees each message is delivered at least once and supports unlimited message retention. Which AWS service should they 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.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon SQS
Amazon SQS (Simple Queue Service) is a fully managed message queue that guarantees at-least-once delivery by default. While standard SQS queues have a maximum message retention period of 14 days, the Amazon SQS Extended Client Library integrates with Amazon S3 to store messages, enabling unlimited retention. This makes SQS the correct choice for ensuring each message is delivered at least once and can be retained indefinitely. Other options do not provide both features: SNS is a pub/sub service with no storage, Kinesis Data Streams has limited retention (up to 365 days) and is for real-time streaming, and Step Functions is a workflow orchestration service, not a message queue.
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.
- ✗
Amazon SNS
Why it's wrong here
SNS is a pub/sub notification service used for fan-out messaging, not a persistent queue with at-least-once delivery guarantees.
- ✓
Amazon SQS
Why this is correct
SQS provides managed message queuing with at-least-once delivery for standard queues and up to 14-day message retention.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon Kinesis Data Streams
Why it's wrong here
Kinesis is designed for real-time streaming data pipelines, not general-purpose message queuing.
- ✗
AWS Step Functions
Why it's wrong here
Step Functions orchestrates workflows, it does not serve as a message queue.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse SNS (pub/sub) with SQS (queue) because both are messaging services, but SNS does not store messages or guarantee at-least-once delivery, making it unsuitable for this requirement.
Detailed technical explanation
How to think about this question
Under the hood, SQS uses a distributed system of servers and a short polling or long polling mechanism to deliver messages. The at-least-once delivery guarantee is achieved through a visibility timeout—when a consumer receives a message, it becomes invisible to other consumers for a configurable period; if the consumer fails to delete the message within that timeout, it becomes visible again and can be re-delivered. For unlimited retention, while the maximum retention period for a standard SQS queue is 14 days, you can implement a pattern where messages are moved to a dead-letter queue or re-queued with a new visibility timeout to effectively retain them indefinitely, though this is a workaround rather than a native feature.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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.
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Cloud Technology and Services — This question tests Cloud Technology and Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon SQS — Amazon SQS (Simple Queue Service) is a fully managed message queue that guarantees at-least-once delivery by default. While standard SQS queues have a maximum message retention period of 14 days, the Amazon SQS Extended Client Library integrates with Amazon S3 to store messages, enabling unlimited retention. This makes SQS the correct choice for ensuring each message is delivered at least once and can be retained indefinitely. Other options do not provide both features: SNS is a pub/sub service with no storage, Kinesis Data Streams has limited retention (up to 365 days) and is for real-time streaming, and Step Functions is a workflow orchestration service, not a message queue.
What should I do if I get this CLF-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.
About these practice questions
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Last reviewed: Jun 11, 2026
This CLF-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CLF-C02 exam.
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