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Docker Certified Associate (DCA) Exam Sample Questions (Q16-Q21):

NEW QUESTION # 16
Will this sequence of steps completely delete an image from disk in the Docker Trusted Registry?
Solution: Delete the image and run garbage collection on the Docker Trusted Registry.

A. Yes
B. No

Answer: A

Explanation:
Explanation
Deleting the image and running garbage collection on the Docker Trusted Registry will completely delete the image from disk. According to the official documentation, this is the recommended way to remove images and reclaim disk space.
References: https://docs.docker.com/ee/dtr/admin/manage-images/garbage-collection/

NEW QUESTION # 17
Is this a way to configure the Docker engine to use a registry without a trusted TLS certificate?
Solution. Set INSECURE_REGISTRY in the' /etc/docker/default' configuration file.

A. Yes
B. No

Answer: A

Explanation:
Explanation
Setting INSECURE_REGISTRY in the /etc/docker/default configuration file is a way to configure the Docker engine to use a registry without a trusted TLS certificate. The INSECURE_REGISTRY option allows you to specify one or more registries that do not have valid TLS certificates or use HTTP instead of HTTPS. This option bypasses the TLS verification for these registries and allows Docker to pull and push images from them without errors. However, this option is not recommended for production use as it exposes your registry communication to potential security risks. References: https://docs.docker.com/registry/insecure/,
https://docs.docker.com/engine/reference/commandline/dockerd/#insecure-registries

NEW QUESTION # 18
Will this command mount the host's '/data' directory to the ubuntu container in read-only mode?
Solution: 'docker run --volume /data:/mydata:ro ubuntu'

A. Yes
B. No

Answer: B

NEW QUESTION # 19
How do you change the default logging driver for the docker daemon in Linux?

A. Install a logging agent on the Linux host.
B. Set the value of log-driver to the name of the logging driver In the daemon.json In /etc/doc
C. Use the -log-driver' flag when you run a container.
D. At the command line, type: docker log driver set <driver name>

Answer: A

NEW QUESTION # 20
You created a new service named 'http' and discover it is not registering as healthy. Will this command enable you to view the list of historical tasks for this service?
Solution: 'docker service inspect http'

A. Yes
B. No

Answer: B

Explanation:
= The command 'docker service inspect http' will display detailed information on the 'http' service, such as its ID, name, mode, replicas, container spec, networks, ports, etc. However, it will not show the list of historical tasks for the service. To view the list of tasks, you need to use the command 'docker service ps http', which will show the ID, name, image, node, desired state, current state, and error of each task12. Reference:
1: docker service inspect | Docker Docs
2: docker service ps | Docker Docs

NEW QUESTION # 21
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