- A
Amazon CloudFront
Why wrong: Amazon CloudFront is a content delivery network (CDN) that caches static and dynamic web content at edge locations. It can accelerate delivery of web pages and media files, but it cannot be used as an in-memory data cache for database query results that are generated by the backend application. CloudFront does not integrate directly with RDS and requires the application to set Cache-Control headers; it does not provide a transparent caching layer for database reads.
- B
Amazon ElastiCache
Amazon ElastiCache is a fully managed, in-memory caching service that supports Memcached and Redis. It can be used to cache the results of frequently executed database queries, reducing the load on the RDS instance and improving application latency. The application can be configured to check the cache first before querying the database, which does not require modifying the core application logic if designed appropriately. This is the correct solution for offloading read traffic from the database.
- C
Amazon DynamoDB Accelerator (DAX)
Why wrong: Amazon DynamoDB Accelerator (DAX) is an in-memory cache specifically designed for Amazon DynamoDB. It cannot be used to cache data from an Amazon RDS database. DAX only works with tables in DynamoDB and does not support caching relational database queries.
- D
Amazon Simple Queue Service (SQS)
Why wrong: Amazon SQS is a fully managed message queuing service used to decouple and buffer requests between application components. It does not provide in-memory caching capabilities and will not reduce the read load on a database. Using SQS would change the architecture to asynchronous processing, not improve read performance.
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 read-heavy web application that retrieves the same product catalog data from an Amazon RDS database hundreds of times per second. The database is experiencing high CPU utilization due to repeated reads of the same information. The company wants to reduce the load on the database and improve application response time without modifying the application code or adding more database capacity. The solution must be fully managed and provide a low-latency, in-memory cache for frequently accessed data. Which AWS service should the company use?
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 ElastiCache
Amazon ElastiCache is the correct choice because it provides a fully managed, in-memory caching service (Memcached or Redis) that can store frequently accessed product catalog data. By caching the results of repeated read queries, ElastiCache offloads the RDS database, reducing CPU utilization and improving response times without requiring application code changes or additional database capacity.
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 CloudFront
Why it's wrong here
Amazon CloudFront is a content delivery network (CDN) that caches static and dynamic web content at edge locations. It can accelerate delivery of web pages and media files, but it cannot be used as an in-memory data cache for database query results that are generated by the backend application. CloudFront does not integrate directly with RDS and requires the application to set Cache-Control headers; it does not provide a transparent caching layer for database reads.
When this WOULD be correct
A company wants to reduce latency for static or dynamic content delivery to global users, with minimal origin server load, and can accept eventual consistency. CloudFront would be correct for caching web content at edge locations.
- ✓
Amazon ElastiCache
Why this is correct
Amazon ElastiCache is a fully managed, in-memory caching service that supports Memcached and Redis. It can be used to cache the results of frequently executed database queries, reducing the load on the RDS instance and improving application latency. The application can be configured to check the cache first before querying the database, which does not require modifying the core application logic if designed appropriately. This is the correct solution for offloading read traffic from the database.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon DynamoDB Accelerator (DAX)
Why it's wrong here
Amazon DynamoDB Accelerator (DAX) is an in-memory cache specifically designed for Amazon DynamoDB. It cannot be used to cache data from an Amazon RDS database. DAX only works with tables in DynamoDB and does not support caching relational database queries.
When this WOULD be correct
A company uses Amazon DynamoDB as its primary database for a read-heavy application and needs to reduce latency for repeated reads of the same items. The solution must be fully managed and provide microsecond response times for high-traffic workloads.
- ✗
Amazon Simple Queue Service (SQS)
Why it's wrong here
Amazon SQS is a fully managed message queuing service used to decouple and buffer requests between application components. It does not provide in-memory caching capabilities and will not reduce the read load on a database. Using SQS would change the architecture to asynchronous processing, not improve read performance.
When this WOULD be correct
A company needs to decouple a front-end web application from a backend processing service to handle variable load and ensure no messages are lost. The solution must buffer requests and allow asynchronous processing. Amazon SQS would be the correct choice.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓Amazon ElastiCacheCorrect answer▾
Why this is correct
Amazon ElastiCache is a fully managed, in-memory caching service that supports Memcached and Redis. It can be used to cache the results of frequently executed database queries, reducing the load on the RDS instance and improving application latency. The application can be configured to check the cache first before querying the database, which does not require modifying the core application logic if designed appropriately. This is the correct solution for offloading read traffic from the database.
✗Amazon CloudFrontWrong answer — click to see why▾
Why this is wrong here
CloudFront is a CDN for caching static content at edge locations, not an in-memory cache for dynamic database query results. It cannot reduce CPU load from repeated RDS reads of the same product catalog data without application code changes.
★ When this WOULD be the correct answer
A company wants to reduce latency for static or dynamic content delivery to global users, with minimal origin server load, and can accept eventual consistency. CloudFront would be correct for caching web content at edge locations.
Why candidates choose this
Candidates may confuse caching at the edge (CDN) with in-memory caching, or think CloudFront can cache any type of data, including database query results, without realizing it requires HTTP-based content and code modifications.
✗Amazon DynamoDB Accelerator (DAX)Wrong answer — click to see why▾
Why this is wrong here
DAX is an in-memory cache for DynamoDB, not RDS. The question specifies the database is Amazon RDS, so DAX cannot be used to cache RDS data.
★ When this WOULD be the correct answer
A company uses Amazon DynamoDB as its primary database for a read-heavy application and needs to reduce latency for repeated reads of the same items. The solution must be fully managed and provide microsecond response times for high-traffic workloads.
Why candidates choose this
Candidates may confuse DAX as a general-purpose caching service similar to ElastiCache, or incorrectly assume it can work with any AWS database, not just DynamoDB.
✗Amazon Simple Queue Service (SQS)Wrong answer — click to see why▾
Why this is wrong here
Amazon SQS is a message queuing service for decoupling application components, not a caching solution. It does not store frequently accessed data in memory for low-latency reads, so it cannot reduce database load from repeated reads.
★ When this WOULD be the correct answer
A company needs to decouple a front-end web application from a backend processing service to handle variable load and ensure no messages are lost. The solution must buffer requests and allow asynchronous processing. Amazon SQS would be the correct choice.
Why candidates choose this
Candidates may confuse SQS with a caching service because both can improve application performance, but SQS is for message queuing, not for storing and retrieving data with low latency.
Analysis generated from the official CLF-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse DAX (a DynamoDB-specific cache) with a general-purpose cache for RDS, or assume CloudFront can serve as an application-level cache for database queries, when in fact ElastiCache is the only fully managed, in-memory caching service that works with RDS without code changes.
Detailed technical explanation
How to think about this question
ElastiCache supports Redis and Memcached engines; Redis offers advanced data structures (e.g., sorted sets, hashes) and persistence options, making it ideal for caching complex query results like product catalogs. Under the hood, ElastiCache uses a distributed architecture with automatic failover and replication, ensuring high availability and sub-millisecond latency for cached data. In a real-world scenario, a read-heavy e-commerce site can reduce RDS load by over 90% by caching product details in ElastiCache, with cache hit ratios often exceeding 80% for frequently accessed items.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
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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 ElastiCache — Amazon ElastiCache is the correct choice because it provides a fully managed, in-memory caching service (Memcached or Redis) that can store frequently accessed product catalog data. By caching the results of repeated read queries, ElastiCache offloads the RDS database, reducing CPU utilization and improving response times without requiring application code changes or additional database capacity.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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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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