This DVA-C02 practice question tests your understanding of deployment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 uses AWS CodeBuild for building and testing their application. They have a build project that runs on a Linux environment. They want to run a build in a custom Docker image that is stored in Amazon ECR. How should they configure the build project?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
In the environment configuration, set the 'Image' field to the ECR image URI.
Option B is correct because AWS CodeBuild allows you to specify a custom Docker image from Amazon ECR by entering its URI directly in the 'Image' field under the environment configuration. This enables the build to run in a container that includes all necessary dependencies, without requiring a Dockerfile in the source code or a managed image.
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.
✗
Add a 'Dockerfile' to the source code and specify it in the buildspec.
Why it's wrong here
This would build a new image during the build, not use an existing one.
✓
In the environment configuration, set the 'Image' field to the ECR image URI.
Why this is correct
CodeBuild supports custom images from ECR.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a managed image provided by AWS CodeBuild.
Why it's wrong here
Managed images are pre-defined, not custom.
✗
Configure the pipeline to pass the image URI as an environment variable.
Why it's wrong here
The image must be specified in the build project configuration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse specifying a Dockerfile to build a new image (Option A) with using an existing custom image as the build environment, leading them to overlook the direct ECR URI configuration in the environment settings.
Detailed technical explanation
How to think about this question
When you specify an ECR image URI in the CodeBuild environment, CodeBuild pulls the image from the private repository using the IAM role attached to the build project, which must have permissions like 'ecr:GetDownloadUrlForLayer' and 'ecr:BatchGetImage'. The image is then used as the runtime container for the build phases, and any dependencies pre-installed in that image are available immediately, reducing build time compared to installing them during each build.
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.
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: In the environment configuration, set the 'Image' field to the ECR image URI. — Option B is correct because AWS CodeBuild allows you to specify a custom Docker image from Amazon ECR by entering its URI directly in the 'Image' field under the environment configuration. This enables the build to run in a container that includes all necessary dependencies, without requiring a Dockerfile in the source code or a managed image.
What should I do if I get this DVA-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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Question Discussion
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