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Docker Certified Associate (DCA) Exam Sample Questions (Q56-Q61):

NEW QUESTION # 56
One of several containers in a pod is marked as unhealthy after failing its livenessProbe many times. Is this the action taken by the orchestrator to fix the unhealthy container?
Solution: The unhealthy container is restarted.

A. No
B. Yes

Answer: B

Explanation:
A liveness probe is a mechanism for indicating your application's internal health to the Kubernetes control plane. Kubernetes uses liveness probes to detect issues within your pods. When a liveness check fails, Kubernetes restarts the container in an attempt to restore your service to an operational state1. Therefore, the action taken by the orchestrator to fix the unhealthy container is to restart it. References:
* Content trust in Docker | Docker Docs
* Docker Content Trust: What It Is and How It Secures Container Images
* A Practical Guide to Kubernetes Liveness Probes | Airplane

NEW QUESTION # 57
Is this a function of UCP?
Solution: image role-based access control

A. No
B. Yes

Answer: A

Explanation:
Image role-based access control is not a function of UCP. UCP has its own built-in authentication mechanism and integrates with LDAP services. It also has role-based access control (RBAC), so that you can control who can access and make changes to your cluster and applications1. However, image role-based access control is a feature of Docker Trusted Registry (DTR), which integrates with UCP and allows you to manage the images you use for your applications2. DTR lets you define granular permissions for images, such as who can push, pull, delete, or scan them3. References: Universal Control Plane overview), Docker Trusted Registry overview), Docker Access Control)

NEW QUESTION # 58
Will this command display a list of volumes for a specific container?
Solution: docker volume logs nginx --containers'

A. No
B. Yes

Answer: A

Explanation:
Explanation
This command will not display a list of volumes for a specific container, because it has several syntax errors and invalid options. According to the official documentation, there is no such command as docker volume logs or such option as --containers.
References: https://docs.docker.com/engine/reference/commandline/volume/

NEW QUESTION # 59
Will this sequence of steps completely delete an image from disk in the Docker Trusted Registry?
Solution.Delete the image and delete the image repository from Docker Trusted Registry.

A. No
B. Yes

Answer: A

Explanation:
Explanation
The sequence of steps will not completely delete an image from disk in the Docker Trusted Registry. Deleting an image and deleting an image repository from the Docker Trusted Registry will only remove the references to the image, but not the actual image data on the disk1. To completely delete an image from disk, you need to run the garbage collection command on the registry server, which will delete any unreferenced blobs2. The garbage collection command is bin/registry garbage-collect /path/to/config.yml3. References: Deleting an image), Garbage collection), Running garbage collection)

NEW QUESTION # 60
When using the Docker client to push an image to a registry, what environment variable is used to instruct the client to perform signing of the image?

A. DOCKER_CONTENT_TRUST=1
B. NOTARY_ENABLE=1
Correct
C. DOCKER_PUSH_SIGN=1
D. DOCKER_IMAGE_SIGN=1

Answer: A

NEW QUESTION # 61
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