What is the purpose of the `EXPOSE` instruction in a Dockerfile?

To document which ports the container listens on at runtime

To actually publish the ports to the host

To create a network for the container

To open ports in the host firewall

What is the primary purpose of a multi-stage build in a Dockerfile?

To reduce the final image size by using multiple FROM instructions

To allow the Dockerfile to be used on multiple platforms

To run multiple containers simultaneously

To increase the build speed by parallelizing instructions

A build context contains a large `node_modules` directory that is not needed in the image. The developer wants to speed up the build and reduce the size of the build context sent to the Docker daemon. Which file should be created and what should it contain?

Create a `docker-compose.yml` file with the line `exclude: node_modules`

Create a `.dockerignore` file with the line `node_modules`

Create a `Dockerfile` with the line `EXCLUDE node_modules`

Create a `.gitignore` file with the line `node_modules`

CiscoCertified Network Associate Automation (CCNA Automation)

Domain 4Objective 6

6. Interpret Contents of a Dockerfile 200-901 Practice Questions (Page 5)

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 21–25

21foundation · easy
Which Dockerfile instruction sets an environment variable that will be available in the container at runtime?
Select an answer first
22foundation · easy
What is the purpose of the `EXPOSE` instruction in a Dockerfile?
Select an answer first
23application · medium
A developer needs to copy a local tar archive into the image and automatically extract it during the build. The archive is in the build context. Which instruction should be used?
Select an answer first
24foundation · easy
What is the primary purpose of a multi-stage build in a Dockerfile?
Select an answer first
25application · medium
A build context contains a large `node_modules` directory that is not needed in the image. The developer wants to speed up the build and reduce the size of the build context sent to the Docker daemon. Which file should be created and what should it contain?
Select an answer first

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6. Interpret Contents of a Dockerfile 200-901 Practice Questions (Page 5)

Questions 21–25

Which Dockerfile instruction sets an environment variable that will be available in the container at runtime?

What is the purpose of the `EXPOSE` instruction in a Dockerfile?

A developer needs to copy a local tar archive into the image and automatically extract it during the build. The archive is in the build context. Which instruction should be used?

What is the primary purpose of a multi-stage build in a Dockerfile?

A build context contains a large `node_modules` directory that is not needed in the image. The developer wants to speed up the build and reduce the size of the build context sent to the Docker daemon. Which file should be created and what should it contain?

Keep studying — 4.0 Application Deployment and Security