This 200-901 practice question tests your understanding of application deployment and security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which Docker command is used to build an image from a Dockerfile?
docker run
Why wrong: docker run creates and starts a container from an image.
docker commit
Why wrong: docker commit creates an image from a container's changes, not from a Dockerfile.
docker build
docker build is the correct command to build an image.
docker create
Why wrong: docker create creates a container but does not build an image.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
docker build
The `docker build` command reads the instructions in a Dockerfile and assembles a Docker image layer by layer. Each instruction in the Dockerfile (e.g., FROM, RUN, COPY) creates a new layer that is cached and reused, making subsequent builds faster. This is the standard and only command designed specifically for building images from a Dockerfile.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
docker run
Why it's wrong here
docker run creates and starts a container from an image.
docker commit
Why it's wrong here
docker commit creates an image from a container's changes, not from a Dockerfile.
docker build
Why this is correct
docker build is the correct command to build an image.
Related concept
Read the scenario before looking for a memorised answer.
docker create
Why it's wrong here
docker create creates a container but does not build an image.
Common exam traps
Cisco often tests the distinction between commands that create containers (`docker run`, `docker create`) and the command that builds images (`docker build`), hoping candidates confuse the purpose of `docker run` with image creation.
Detailed technical explanation
Under the hood, `docker build` sends the build context (the directory containing the Dockerfile and any referenced files) to the Docker daemon, which then executes each instruction in the Dockerfile sequentially. Each instruction produces a new intermediate image layer, and the final image is a union of these layers. This layered architecture enables efficient caching: if a layer hasn't changed, Docker reuses the cached version, drastically speeding up rebuilds in CI/CD pipelines.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 200-901 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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
Application Deployment and Security — This question tests Application Deployment and Security — Read the scenario before looking for a memorised answer..
The correct answer is: docker build — The `docker build` command reads the instructions in a Dockerfile and assembles a Docker image layer by layer. Each instruction in the Dockerfile (e.g., FROM, RUN, COPY) creates a new layer that is cached and reused, making subsequent builds faster. This is the standard and only command designed specifically for building images from a Dockerfile.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This 200-901 practice question is part of Courseiva's free Cisco 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 200-901 exam.
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