Practice Set
Practice questions aggregated across this exam type.
Practice Questions
10 of 126 questions
Q1. A developer runs docker run nginx on a fresh machine where the image has never been downloaded. Which sequence of components handles this command?
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Q2. A security review flags a CI container that is started with -v /var/run/docker.sock:/var/run/docker.sock. Why is this mount considered high risk?
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Q3. An operations team must guarantee that a memory-leaking Java container can never consume more than 512 MB of RAM and starve neighboring containers. Which kernel mechanism does Docker use when they run the container with --memory=512m?
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Q4. In Docker's runtime stack, which component is the low-level, OCI-compliant runtime that actually creates the container process using Linux namespaces and cgroups?
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Q5. A developer runs ps aux inside a container and is surprised to see only two processes — their app as PID 1 and the ps command itself — even though the host runs hundreds of processes. Which mechanism explains this?
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Q6. An engineer wants to run docker CLI commands from their laptop against the Docker daemon on a remote build server, without SSHing in for every command. What makes this possible?
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Q7. A team asks whether they can use Docker containers on their Linux servers to run an application that requires a Windows kernel. What is the correct assessment?
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Q8. A startup must pack hundreds of small service instances onto each host and scale replicas out within seconds during traffic spikes. Why do containers fit this requirement where virtual machines struggle?
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Q9. A newcomer asks: "We deploy the image shop-api:3.2 to three hosts — is the image now running in three places?" What is the accurate correction?
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Q10. A developer runs docker run -d ubuntu and finds the container immediately in "Exited (0)" status. The image works fine when others use it interactively. Why did the container stop?
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Important Concepts
Study chapter-wise concepts before you practice.