- A
Amazon Simple Queue Service (SQS)
SQS is a fully managed message queue that reliably stores messages until consumers retrieve them. It decouples the order submission from processing, buffering bursts and preventing loss.
- B
Amazon Simple Notification Service (SNS)
Why wrong: SNS is a publish/subscribe messaging service that delivers messages to subscribers (e.g., Lambda, HTTP endpoints). It does not provide durable buffering; messages are not stored for later retrieval.
- C
Amazon Kinesis Data Firehose
Why wrong: Kinesis Data Firehose is designed to capture and load streaming data into data stores like Amazon S3 or Redshift, not to queue individual messages for application processing.
- D
Amazon ElastiCache
Why wrong: ElastiCache is a managed in-memory caching service (Redis or Memcached). It improves read performance but does not provide durable storage or message queuing capabilities.
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 runs a monolithic order processing application on a single Amazon EC2 instance. During peak hours, the instance receives a sudden burst of orders that exceeds its processing capacity. Orders are dropped and customers do not receive confirmations. The company needs a solution that buffers incoming orders, stores them durably, and allows the application to process them at a manageable pace. The solution must be fully managed and ensure that no orders are lost. Which AWS service should the company use to meet these requirements?
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 Simple Queue Service (SQS)
Amazon Simple Queue Service (SQS) is a fully managed message queuing service that decouples application components. It durably stores incoming orders in a queue, allowing the EC2 instance to poll and process them at its own pace, preventing order loss during traffic bursts. SQS guarantees at-least-once delivery and provides a buffer that absorbs spikes in demand.
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 Simple Queue Service (SQS)
Why this is correct
SQS is a fully managed message queue that reliably stores messages until consumers retrieve them. It decouples the order submission from processing, buffering bursts and preventing loss.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon Simple Notification Service (SNS)
Why it's wrong here
SNS is a publish/subscribe messaging service that delivers messages to subscribers (e.g., Lambda, HTTP endpoints). It does not provide durable buffering; messages are not stored for later retrieval.
- ✗
Amazon Kinesis Data Firehose
Why it's wrong here
Kinesis Data Firehose is designed to capture and load streaming data into data stores like Amazon S3 or Redshift, not to queue individual messages for application processing.
- ✗
Amazon ElastiCache
Why it's wrong here
ElastiCache is a managed in-memory caching service (Redis or Memcached). It improves read performance but does not provide durable storage or message queuing capabilities.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse SNS (push-based) with SQS (pull-based), assuming any notification or messaging service can buffer orders, but only SQS provides the durable, decoupled queue needed for the application to process at its own pace.
Detailed technical explanation
How to think about this question
SQS uses a distributed, replicated storage backend to ensure messages are durably stored across multiple Availability Zones. The default visibility timeout (30 seconds) allows the consumer to process a message and delete it; if the consumer fails, the message becomes visible again after the timeout, ensuring no orders are lost. SQS also supports long polling (ReceiveMessageWaitTimeSeconds up to 20 seconds) to reduce empty responses and improve efficiency.
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.
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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 Simple Queue Service (SQS) — Amazon Simple Queue Service (SQS) is a fully managed message queuing service that decouples application components. It durably stores incoming orders in a queue, allowing the EC2 instance to poll and process them at its own pace, preventing order loss during traffic bursts. SQS guarantees at-least-once delivery and provides a buffer that absorbs spikes in demand.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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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