A containerized application needs to know the environment name (e.g., production) at runtime. The Dockerfile should set a default of development, but operators must be able to override it. Which instruction should be used?

CMD ["ENVIRONMENT=development"]

RUN export ENVIRONMENT=development

What is the primary purpose of the FROM instruction in a Dockerfile?

To expose network ports to the host

To specify the base image for the build

To run a command when the container starts

To copy files from the host into the image

CiscoCertified Network Associate Automation (CCNA Automation)

Domain 4Objective 6

6. Interpret Contents of a Dockerfile 200-901 Practice Questions (Page 8)

Part of the 4.0 Application Deployment and Security domain, which accounts for 15% of the 200-901 exam. Cisco does not publish an official question count, but from its 120-minute exam (~50–80 total, ~8–12 in this domain), expect 1–1 from this objective — we provide 43 practice questions to prepare you well beyond it. (estimate)

43questions here

9free pages

12concepts

15%of the exam

Questions 36–40

36foundation · easy
Which Dockerfile instruction is specifically designed to copy files from the build context into the image, without any additional features?
Select an answer first
37application · easy
A containerized application needs to know the environment name (e.g., production) at runtime. The Dockerfile should set a default of development, but operators must be able to override it. Which instruction should be used?
Select an answer first
38application · medium
A Dockerfile for a Node.js application uses `RUN npm install` and then `CMD ["npm", "start"]`. The application expects to run from the `/app` directory. Which instruction should be placed before the `RUN` command to ensure the correct working directory?
Select an answer first
39foundation · easy
Which Dockerfile instruction sets the working directory for subsequent instructions?
Select an answer first
40foundation · easy
What is the primary purpose of the FROM instruction in a Dockerfile?
Select an answer first

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6. Interpret Contents of a Dockerfile 200-901 Practice Questions (Page 8)

Questions 36–40

Which Dockerfile instruction is specifically designed to copy files from the build context into the image, without any additional features?

A containerized application needs to know the environment name (e.g., production) at runtime. The Dockerfile should set a default of development, but operators must be able to override it. Which instruction should be used?

A Dockerfile for a Node.js application uses `RUN npm install` and then `CMD ["npm", "start"]`. The application expects to run from the `/app` directory. Which instruction should be placed before the `RUN` command to ensure the correct working directory?

Which Dockerfile instruction sets the working directory for subsequent instructions?

What is the primary purpose of the FROM instruction in a Dockerfile?

Keep studying — 4.0 Application Deployment and Security