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Question 722 of 1,750

SDLC Automation →hardMultiple ChoiceObjective-mapped

DOP-C02 SDLC Automation Practice Question

This DOP-C02 practice question tests your understanding of sdlc automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 to compile and test code. The buildspec.yaml includes a pre_build phase that runs 'aws ecr get-login-password --region us-east-1 | docker login --username AWS --password-stdin 123456789012.dkr.ecr.us-east-1.amazonaws.com'. The build fails with 'Error: Cannot connect to the Docker daemon'. What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The CodeBuild project does not have privileged mode enabled.
Docker commands require privileged mode in CodeBuild.
B
The region specified does not match the ECR repository region.
Why wrong: The region matches.
C
The Docker login command syntax is incorrect.
Why wrong: The syntax is correct for ECR login.
D
The AWS CLI is not installed in the CodeBuild environment.
Why wrong: AWS CLI is available in CodeBuild environments.

Full breakdown with real-world context →

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

✓

The CodeBuild project does not have privileged mode enabled.

The error 'Cannot connect to the Docker daemon' indicates that the Docker daemon is not running or inaccessible within the CodeBuild build environment. CodeBuild runs Docker commands inside a container that does not have a Docker daemon by default. To execute Docker commands (such as docker login or docker build), the CodeBuild project must be configured with privileged mode enabled, which grants the container elevated permissions to run its own Docker daemon. Without privileged mode, any attempt to interact with the Docker daemon will fail.

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.

✓
The CodeBuild project does not have privileged mode enabled.
Why this is correct
Docker commands require privileged mode in CodeBuild.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The region specified does not match the ECR repository region.
Why it's wrong here
The region matches.
✗
The Docker login command syntax is incorrect.
Why it's wrong here
The syntax is correct for ECR login.
✗
The AWS CLI is not installed in the CodeBuild environment.
Why it's wrong here
AWS CLI is available in CodeBuild environments.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may focus on the AWS CLI or ECR authentication syntax, missing that the fundamental issue is the Docker daemon not being available, which is a CodeBuild-specific configuration requirement for running Docker commands.

Detailed technical explanation

How to think about this question

Under the hood, CodeBuild runs builds in a Docker container that by default runs with limited privileges. When privileged mode is disabled, the container cannot access the host's Docker socket or start its own Docker daemon, making any docker command that requires the daemon fail. Enabling privileged mode in the CodeBuild project sets the container's security context to allow it to run a Docker-in-Docker (DinD) setup, which starts a nested Docker daemon inside the build container. This is a common pattern for CI/CD pipelines that need to build, tag, and push Docker images.

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.

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 DOP-C02 question test?

SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The CodeBuild project does not have privileged mode enabled. — The error 'Cannot connect to the Docker daemon' indicates that the Docker daemon is not running or inaccessible within the CodeBuild build environment. CodeBuild runs Docker commands inside a container that does not have a Docker daemon by default. To execute Docker commands (such as docker login or docker build), the CodeBuild project must be configured with privileged mode enabled, which grants the container elevated permissions to run its own Docker daemon. Without privileged mode, any attempt to interact with the Docker daemon will fail.

What should I do if I get this DOP-C02 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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