200-901 Application Deployment and Security Practice Question
A developer wants to create a Docker image that runs a Python application. Which instruction should be placed at the end of the Dockerfile to specify the command that runs when the container starts?
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
✓
CMD
CMD specifies the default command to run when the container starts, and it can be overridden by providing a command at runtime. ENTRYPOINT is similar but not easily overridden. RUN executes during build. COPY copies files during build.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RUN
Why it's wrong here
RUN executes commands during the build process, not at container startup.
- ✗
ENTRYPOINT
Why it's wrong here
ENTRYPOINT also specifies a command but is more rigid; CMD is typically used for the main command.
- ✗
COPY
Why it's wrong here
COPY copies files into the image during build.
- ✓
CMD
Why this is correct
CMD specifies the command to run when the container starts.
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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.