- A
Create a Docker Hub access token and store it in AWS Secrets Manager
Why wrong: Creating a Docker Hub access token and storing it in Secrets Manager helps with authentication but does not reduce the frequency of image pulls.
- B
Enable CodeBuild local caching for the cache type 'LOCAL_DOCKER_LAYER_CACHE'
Correct. CodeBuild local caching with LOCAL_DOCKER_LAYER_CACHE caches image layers locally, reducing the need to pull from Docker Hub on subsequent builds.
- C
Store the base image in Amazon ECR and use it in the build
Correct. Storing the base image in Amazon ECR provides a local registry within AWS, eliminating the need to pull from Docker Hub.
- D
Use AWS CodeArtifact as a proxy for Docker Hub
Why wrong: Incorrect. While CodeArtifact can be configured as a proxy for Docker Hub, it is not a standard method to reduce Docker image pulls; local caching and ECR are the recommended approaches.
- E
Configure CodeBuild to use a VPC with a NAT gateway
Why wrong: Configuring CodeBuild to use a VPC with a NAT gateway enables internet access but does not reduce Docker Hub pulls.
DOP-C02 CodeBuild Local Caching Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. 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. A key principle to apply: codeBuild Local Caching. 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 DevOps engineer is designing a CI/CD pipeline for a containerized application using AWS CodeBuild and Amazon ECS. Which TWO actions will help reduce the frequency of Docker image pulls from the public Docker Hub 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
Enable CodeBuild local caching for the cache type 'LOCAL_DOCKER_LAYER_CACHE'
Option B enables CodeBuild local caching with LOCAL_DOCKER_LAYER_CACHE, which caches Docker image layers locally across builds within the same build project, reducing the need to pull layers from Docker Hub. Option C stores the base image in Amazon ECR, making it available within the AWS network and eliminating the need to pull from Docker Hub. Both actions directly reduce the frequency of Docker image pulls from the public registry.
Key principle: CodeBuild Local Caching
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a Docker Hub access token and store it in AWS Secrets Manager
Why it's wrong here
Creating a Docker Hub access token and storing it in Secrets Manager helps with authentication but does not reduce the frequency of image pulls.
- ✓
Enable CodeBuild local caching for the cache type 'LOCAL_DOCKER_LAYER_CACHE'
Why this is correct
Correct. CodeBuild local caching with LOCAL_DOCKER_LAYER_CACHE caches image layers locally, reducing the need to pull from Docker Hub on subsequent builds.
Related concept
CodeBuild Local Caching
- ✓
Store the base image in Amazon ECR and use it in the build
Why this is correct
Correct. Storing the base image in Amazon ECR provides a local registry within AWS, eliminating the need to pull from Docker Hub.
Related concept
CodeBuild Local Caching
- ✗
Use AWS CodeArtifact as a proxy for Docker Hub
Why it's wrong here
Incorrect. While CodeArtifact can be configured as a proxy for Docker Hub, it is not a standard method to reduce Docker image pulls; local caching and ECR are the recommended approaches.
- ✗
Configure CodeBuild to use a VPC with a NAT gateway
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates may think that D (CodeArtifact proxy) is correct, but CodeArtifact is primarily for managing software packages and artifacts, not specifically for Docker image caching. While it can proxy Docker Hub, it does not provide the same layer caching benefits as local caching or ECR.
Detailed technical explanation
How to think about this question
Under the hood, Docker Hub enforces rate limits based on IP address and account tier; using ECR as a local registry avoids these limits entirely by serving the image from within the same AWS region. CodeArtifact as a proxy for Docker Hub (Option D) caches pulled images in a private repository, so subsequent builds retrieve the image from the proxy instead of Docker Hub, reducing external pulls. In a real-world scenario, a team with frequent builds can exhaust Docker Hub's anonymous rate limit (100 pulls per 6 hours per IP) quickly, making ECR or CodeArtifact essential for CI/CD reliability.
KKey Concepts to Remember
- CodeBuild Local Caching
- Amazon ECR
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
CodeBuild Local Caching
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.
Review codeBuild Local Caching, then practise related DOP-C02 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — CodeBuild Local Caching.
What is the correct answer to this question?
The correct answer is: Enable CodeBuild local caching for the cache type 'LOCAL_DOCKER_LAYER_CACHE' — Option B enables CodeBuild local caching with LOCAL_DOCKER_LAYER_CACHE, which caches Docker image layers locally across builds within the same build project, reducing the need to pull layers from Docker Hub. Option C stores the base image in Amazon ECR, making it available within the AWS network and eliminating the need to pull from Docker Hub. Both actions directly reduce the frequency of Docker image pulls from the public registry.
What should I do if I get this DOP-C02 question wrong?
Review codeBuild Local Caching, then practise related DOP-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
CodeBuild Local Caching
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Last reviewed: Jul 4, 2026
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