- A
Amazon ECS
Why wrong: ECS is a container orchestration service that runs containers. It uses images stored in ECR but is not itself a registry.
- B
Amazon S3
Why wrong: S3 can store container image tarballs as objects, but ECR is purpose-built for container images with layer caching, versioning, and native ECS/EKS integration.
- C
Amazon ECR
ECR is a fully managed private container image registry. It stores Docker images in repositories, supports image versioning with tags and digests, integrates natively with ECS and EKS, and includes automated vulnerability scanning.
- D
AWS CodeBuild
Why wrong: CodeBuild compiles code and can build Docker images. The resulting images are typically pushed to ECR for storage, but CodeBuild is the build service, not the registry.
Quick Answer
Amazon ECR (Elastic Container Registry) is the correct choice because it provides a fully managed, private Docker container image registry that stores, versions, and deploys container images with native integration to Amazon ECS and Amazon EKS. This service eliminates the need to manage underlying registry infrastructure, allowing development teams to securely store and pull images directly within their CI/CD pipeline for automated deployments. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your understanding of core AWS container services and their integrations—a common trap is confusing Amazon ECR with Amazon ECS (the orchestration service) or Amazon EKS (Kubernetes control plane), but remember that ECR is purely the registry for storing images, while ECS and EKS are the compute platforms that run them. A helpful memory tip: think of ECR as the “container library” where you check in and check out images, just like a code repository for Docker artifacts.
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 development team builds Docker container images as part of their CI/CD pipeline and needs a managed, private registry to store and version these images, integrated with Amazon ECS and EKS for deployment. Which AWS service provides this container image registry?
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 ECR
Amazon ECR (Elastic Container Registry) is the correct choice because it is a fully managed Docker container registry that stores, manages, and deploys container images. It integrates natively with Amazon ECS and Amazon EKS, allowing seamless image pulls during deployment without needing to manage underlying infrastructure.
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 ECS
Why it's wrong here
ECS is a container orchestration service that runs containers. It uses images stored in ECR but is not itself a registry.
- ✗
Amazon S3
Why it's wrong here
S3 can store container image tarballs as objects, but ECR is purpose-built for container images with layer caching, versioning, and native ECS/EKS integration.
- ✓
Amazon ECR
Why this is correct
ECR is a fully managed private container image registry. It stores Docker images in repositories, supports image versioning with tags and digests, integrates natively with ECS and EKS, and includes automated vulnerability scanning.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS CodeBuild
Why it's wrong here
CodeBuild compiles code and can build Docker images. The resulting images are typically pushed to ECR for storage, but CodeBuild is the build service, not the registry.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the distinction between a container registry (ECR) and a container orchestrator (ECS/EKS), so candidates mistakenly select ECS thinking it includes image storage, but ECS only schedules and runs containers.
Detailed technical explanation
How to think about this question
Amazon ECR uses the Docker Registry HTTP API V2, enabling standard `docker push` and `docker pull` commands via HTTPS. It stores images in a highly available, encrypted backend (backed by Amazon S3) and supports image scanning using the Common Vulnerabilities and Exposures (CVE) database from open-source providers. In a real-world CI/CD pipeline, ECR can enforce immutable image tags to prevent overwrites, ensuring traceability and rollback capability.
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 ECR — Amazon ECR (Elastic Container Registry) is the correct choice because it is a fully managed Docker container registry that stores, manages, and deploys container images. It integrates natively with Amazon ECS and Amazon EKS, allowing seamless image pulls during deployment without needing to manage underlying infrastructure.
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 30, 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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