200-901 Application Deployment and Security Practice Question
A developer needs to share a Docker image with a colleague. They decide to push the image to a registry. Which Docker command pushes an image to a registry?
⚠ Common exam trap
200-901 often tests the confusion between commands that manipulate local images (commit, export) and those that interact with a registry (push, pull), so candidates must remember that push uploads and pull downloads.
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
✓
docker push my-image:latest
The `docker push` command is specifically designed to upload a local Docker image to a registry, such as Docker Hub or a private registry. It takes the image name and tag, and sends the image layers to the registry, making it available for others to pull. This is the standard way to share images with colleagues or deploy to other environments.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
docker export my-image:latest
Why it's wrong here
docker export streams a container's filesystem as a tar archive; it never contacts a registry, so no push occurs. It is tempting because it does move image content off the host, but only to stdout or a file. docker push is the command that uploads an image to a registry.
- ✗
docker commit my-image:latest
Why it's wrong here
docker commit creates a new image from a container's writable layer; it writes to the local image store and never contacts a registry. It is tempting because it produces an image, which feels like the prerequisite for sharing, but the upload itself requires docker push.
- ✓
docker push my-image:latest
Why this is correct
docker push uploads a locally tagged image and its layers to the configured registry repository, making it available for the colleague to pull. Commands such as docker save or docker commit do not transfer the image to a registry, so they fail the sharing requirement.
- ✗
docker pull my-image:latest
Why it's wrong here
docker pull downloads an image from a registry to the local daemon; it performs the opposite direction of the required upload. It is tempting because it names a registry image reference, but sharing an image requires docker push, which uploads the tagged image to the registry.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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