What happens to the layer cache when a file copied with COPY changes?

The entire image is rebuilt from scratch, ignoring all cache

Only the COPY layer is rebuilt; all subsequent layers are reused

The build fails because the cache is invalid

The COPY layer and all subsequent layers are rebuilt

What is required before pushing an image to a private registry?

The image must be running as a container

Authentication with the registry

The image must be built with a specific base image

The image must be exported to a tar file

What is the purpose of a .dockerignore file?

To specify which base images are allowed in the build

To exclude files and directories from the build context sent to the Docker daemon

To define environment variables for the build process

To list the files that should be included in the final image

A team needs to distribute a container image that runs on both `linux/amd64` and `linux/arm64` architectures. They have built the image for each architecture separately. Which approach should they use to create a single multi-architecture image reference?

Use `docker buildx build --platform linux/amd64,linux/arm64 -t myapp:latest --push .`

Use `docker build --platform linux/amd64,linux/arm64 -t myapp:latest .`

Build one image and rely on the registry to convert it for other architectures

Build each image and push them with different tags, e.g., `myapp:amd64` and `myapp:arm64`

LPI DevOps Tools Engineer

Domain 2Objective 3

702.3 Container Image Building (weight: 5) DEVOPS-TOOLS-ENGINEER Practice Questions (Page 1)

Part of the 702 Application Container domain, which makes up ~18% of our current practice bank. Linux Professional Institute does not publish an official question count, but from its 90-minute exam (~35–60 total, ~6–11 in this domain), expect 2–4 from this objective — we provide 28 practice questions to prepare you well beyond it. (estimate)

28questions here

6free pages

10concepts

Questions 1–5

1foundation · easy
What happens to the layer cache when a file copied with COPY changes?
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2foundation · easy
What is required before pushing an image to a private registry?
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3foundation · easy
Which command is used to upload a locally built image to a container registry?
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4foundation · easy
What is the purpose of a .dockerignore file?
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5application · medium
A team needs to distribute a container image that runs on both `linux/amd64` and `linux/arm64` architectures. They have built the image for each architecture separately. Which approach should they use to create a single multi-architecture image reference?
Select an answer first

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