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200-901 Practice Question: A developer needs to run a temporary container…
A developer needs to run a temporary container that executes a command and then exits. Which Docker command should be used?
⚠ Common exam trap
Cisco often tests the distinction between `docker run` (creates and starts a new container) and `docker exec` (attaches to an existing running container), leading candidates to mistakenly choose `docker exec` for running a one-time command.
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 run --rm
The `docker run --rm` command creates a container, runs the specified command, and automatically removes the container filesystem after it exits. This is the correct approach for a temporary, disposable container that should not persist after execution. The `--rm` flag ensures cleanup without manual intervention.
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 exec
Why it's wrong here
docker exec runs a command in a running container, not for initial execution.
- ✗
docker run -d
Why it's wrong here
This runs a container in detached mode, but doesn't remove it automatically.
- ✗
docker start
Why it's wrong here
docker start starts an existing stopped container, not for one-time commands.
- ✓
docker run --rm
Why this is correct
This runs a container and removes it after it exits.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.