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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 on Amazon EC2 instances that queries an Amazon RDS database. As traffic grows, the database CPU utilization is consistently high, causing slow response times for users. The company wants to reduce the load on the database by caching frequently accessed query results. They need a fully managed, in-memory caching service that can be set up quickly and integrates with common programming languages. Which AWS service should they 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 a fully managed, in-memory caching service that supports Redis and Memcached, both of which integrate with common programming languages via standard client libraries. It can be deployed quickly to cache frequently accessed database query results, offloading read traffic from the Amazon RDS instance and reducing CPU utilization.

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 DynamoDB Accelerator (DAX)

    Why it's wrong here

    DAX is an in-memory cache for Amazon DynamoDB, not for Amazon RDS. It accelerates reads on DynamoDB tables but cannot be used with relational databases.

    When this WOULD be correct

    A company uses Amazon DynamoDB as its primary database and experiences high latency due to frequent reads. They need a fully managed, in-memory cache that integrates seamlessly with DynamoDB and supports common programming languages. In that scenario, DAX would be the correct answer.

  • ✓

    Amazon ElastiCache

    Why this is correct

    Amazon ElastiCache is a fully managed in-memory caching service that supports Redis and Memcached. It can be used to cache frequently accessed database query results, reducing the load on Amazon RDS and improving application response times.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    Amazon CloudFront

    Why it's wrong here

    Amazon CloudFront is a content delivery network (CDN) that caches web content at edge locations to reduce latency for end users. It does not cache database query results from RDS.

    When this WOULD be correct

    A company wants to reduce latency for users worldwide by caching static web content (e.g., images, CSS, JavaScript) and serving it from edge locations. They need a global CDN that integrates with AWS origins like S3 or EC2. Amazon CloudFront would be the correct answer.

  • ✗

    Amazon S3 Transfer Acceleration

    Why it's wrong here

    Amazon S3 Transfer Acceleration speeds up uploads to Amazon S3 over long distances by using AWS edge locations. It is not used for caching database queries.

    When this WOULD be correct

    A company needs to accelerate uploads of large files to an S3 bucket from geographically distributed clients, and they require a fully managed service that uses AWS edge locations.

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 Redis and Memcached. It can be used to cache frequently accessed database query results, reducing the load on Amazon RDS and improving application response times.

✗Amazon DynamoDB Accelerator (DAX)Wrong answer — click to see why▾

Why this is wrong here

DAX is an in-memory cache for Amazon DynamoDB, not for Amazon RDS. The question specifies an RDS database, so DAX cannot be used to cache RDS query results.

★ When this WOULD be the correct answer

A company uses Amazon DynamoDB as its primary database and experiences high latency due to frequent reads. They need a fully managed, in-memory cache that integrates seamlessly with DynamoDB and supports common programming languages. In that scenario, DAX would be the correct answer.

Why candidates choose this

Candidates may confuse DAX as a general-purpose caching service due to its name containing 'Accelerator' and its in-memory nature, overlooking that it is tightly coupled with DynamoDB.

✗Amazon CloudFrontWrong answer — click to see why▾

Why this is wrong here

Amazon CloudFront is a content delivery network (CDN) that caches static and dynamic content at edge locations, not an in-memory caching service for database query results. It does not provide low-latency, in-memory caching for application-level data like RDS query results.

★ When this WOULD be the correct answer

A company wants to reduce latency for users worldwide by caching static web content (e.g., images, CSS, JavaScript) and serving it from edge locations. They need a global CDN that integrates with AWS origins like S3 or EC2. Amazon CloudFront would be the correct answer.

Why candidates choose this

Candidates may confuse caching at the edge (CDN) with in-memory caching, or think CloudFront can cache database query results because it supports dynamic content caching. They might overlook the requirement for a fully managed, in-memory cache that integrates with programming languages.

✗Amazon S3 Transfer AccelerationWrong answer — click to see why▾

Why this is wrong here

Amazon S3 Transfer Acceleration is designed to speed up uploads to S3 over long distances, not for caching database query results in memory.

★ When this WOULD be the correct answer

A company needs to accelerate uploads of large files to an S3 bucket from geographically distributed clients, and they require a fully managed service that uses AWS edge locations.

Why candidates choose this

Candidates may confuse 'acceleration' with 'caching' and think S3 Transfer Acceleration can speed up database queries, or they may associate it with content delivery caching similar to CloudFront.

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, or think CloudFront can cache database query results, when in fact ElastiCache is the correct service for caching RDS query outputs in a read-heavy application.

Detailed technical explanation

How to think about this question

ElastiCache for Redis supports advanced data structures like sorted sets and hashes, enabling complex caching patterns such as leaderboards or session stores. In a read-heavy web application, implementing a cache-aside (lazy loading) pattern with ElastiCache can reduce database load by 80-90% for repeated queries, while also providing sub-millisecond response times. The service handles failover, patching, and backups automatically, making it a true fully managed solution.

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.

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 ElastiCache — Amazon ElastiCache is a fully managed, in-memory caching service that supports Redis and Memcached, both of which integrate with common programming languages via standard client libraries. It can be deployed quickly to cache frequently accessed database query results, offloading read traffic from the Amazon RDS instance and reducing CPU utilization.

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

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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.