Discuss Cisco 200-901 Exam Topic 17 Question 26

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.

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/

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8 comments · newest first

Gladys 12 months ago

B seems right; no IP means no external access.

Benedict 12 months ago

Definitely option C! That's how it works.

Kirk 1 year ago

Wait, so it doesn't open the port to the outside world? That's surprising!

Yuonne 1 year ago

I think it's only accessible to other containers, not external clients.

Eileen 1 year ago

EXPOSE just makes the port available to other containers.

Linwood 1 year ago

Okay, I've got this. If the washing powder has achieved high market growth and a high market share, that means it's in the "star" quadrant of the BCG matrix. That's the one for products with high growth and high market share.

Melvin 1 year ago

I'm pretty sure the list of Document Revisions comes from Managed Documents, so I'll go with option A.

Mona 1 year ago

I'm torn between A and B, but I lean towards A because it emphasizes "ongoing" support, right?

Cisco 200-901 Exam - Topic 17 Question 26 Discussion