Cisco Exam 200-901 Topic 17 Question 26 Discussion

Actual exam question for Cisco's 200-901 exam

Question #: 26
Topic #: 17

Refer to the exhibit.

Which function does the EXPOSE line perform when building an image from this Dockerfile?

ALocal port 8080 of the container that launched with this docker image is accessible from co-hosted containers and external clients.

BLocal port 8080 is not reachable at all because no IP address is specified along with the EXPOSE command of the Dockerfile.

CLocal port 8080 is accessible from other containers running on the same docker host as the container that launched with this docker image.

DLocal port 8080 of the container that launched with this docker image is accessible to external clients.

Show Suggested Answer

Suggested Answer: C

By default, the EXPOSE instruction does not expose the container's ports to be accessible from the host. In other words, it only makes the stated ports available for inter-container interaction.

Whereas publishing a port using either -P or -p exposes it, exposing a port using EXPOSE or --expose does not publish it.

So, while exposed ports can only be accessed internally, published ports can be accessible by external containers and services.

https://www.whitesourcesoftware.com/free-developer-tools/blog/docker-expose-port/

by Raylene at May 09, 2022, 07:55 AM

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