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Free PDF 2025 Docker DCA: Docker Certified Associate (DCA) Exam First-grade Exam Lab Questions

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>> DCA Exam Lab Questions <<

Quiz 2025 Valid Docker DCA Exam Lab Questions

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Docker Certified Associate (DCA) certification exam is designed for IT professionals who want to demonstrate their proficiency in containerization technology and Docker Enterprise Edition. Docker Certified Associate (DCA) Exam certification exam validates the skills and knowledge required to design, deploy, and manage Docker containers, Kubernetes clusters, and Docker Swarm clusters. The DCA Certification is ideal for individuals who work with Docker on a daily basis and want to showcase their expertise in the field of containerization.

Docker Certified Associate (DCA) Exam Sample Questions (Q92-Q97):

NEW QUESTION # 92
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 ps http'

A. Yes
B. No

Answer: A

Explanation:
= The command 'docker service ps http' will list the tasks that are running as part of the 'http' service, as well as the task history1. The task history shows the previous states of the tasks, such as running, shutdown, rejected, etc. This can help you troubleshoot why the service is not registering as healthy, by looking at the current state, error, and ports of each task1. Reference:
docker service ps | Docker Docs
Docker Certified Associate Guide
DCA Prep Guide

NEW QUESTION # 93
Will this configuration achieve fault tolerance for managers in a swarm?
Solution: only two managers, one active and one passive.

A. Yes
B. No

Answer: B

NEW QUESTION # 94
Are these conditions sufficient for Kubernetes to dynamically provision a persistentVolume, assuming there are no limitations on the amount and type of available external storage?
Solution: A persistentVolumeClaim is created that specifies a pre-defined storageClass.

A. Yes
B. No

Answer: A

Explanation:
Explanation
= The conditions are sufficient for Kubernetes to dynamically provision a persistentVolume, because a storageClass defines the provisioner and parameters for creating a volume on-demand. A persistentVolumeClaim that specifies a storageClass triggers the dynamic provisioning process, and Kubernetes will automatically create and bind a persistentVolume that matches the request. This eliminates the need for manual intervention by cluster administrators to provision storage volumes. References:
* Dynamic Volume Provisioning | Kubernetes
* Persistent volumes and dynamic provisioning | Google Kubernetes Engine ...
* Dynamic Provisioning and Storage Classes in Kubernetes

NEW QUESTION # 95
Does this command create a swarm service that only listens on port 53 using the UDP protocol?
Solution: 'docker service create -name dns-cache -p 53:53 -service udp dns-cache'

A. Yes
B. No

Answer: B

Explanation:
The command docker service create -name dns-cache -p 53:53 -service udp dns-cache is not valid because it has some syntax errors. The correct syntax for creating a swarm service is docker service create [OPTIONS] IMAGE [COMMAND] [ARG...]. The errors in the command are:
There should be a space between the option flag and the option value. For example, -name dns-cache should be -name dns-cache.
The option flag for specifying the service mode is -mode, not -service. For example, -service udp should be -mode udp.
The option flag for specifying the port mapping is --publish or -p, not -p. For example, -p 53:53 should be --publish 53:53.
The correct command for creating a swarm service that only listens on port 53 using the UDP protocol is:
docker service create --name dns-cache --publish 53:53/udp dns-cache
This command will create a service called dns-cache that uses the dns-cache image and exposes port 53 on both the host and the container using the UDP protocol.
[docker service create | Docker Documentation] : [Publish ports for services | Docker Documentation]

NEW QUESTION # 96
You configure a local Docker engine to enforce content trust by setting the environment variable DOCKER_CONTENT_TRUST=1.
If myorg/myimage: 1.0 is unsigned, does Docker block this command?
Solution: docker image inspect myorg/myimage: 1.0

A. Yes
B. No

Answer: A

Explanation:
= Docker will block the command docker image inspect myorg/myimage: 1.0 if the image tag is unsigned and the environment variable DOCKER_CONTENT_TRUST is set to 1. This is because Docker Content Trust (DCT) enables the verification of the integrity and publisher of Docker images using digital signatures1. When DCT is enabled, Docker will only pull, run, or inspect images that have a valid signature2. If the image tag is not signed, Docker will reject the command and display an error message, such as No valid trust data for 1.03. To inspect an unsigned image, you need to either disable DCT by setting DOCKER_CONTENT_TRUST to 0, or use the --disable-content-trust flag with the command. Reference:
Content trust in Docker | Docker Docs
Enable and disable content trust in Docker | Docker Docs
Docker Content Trust: What It Is and How It Secures Container Images
[docker image inspect | Docker Docs]

NEW QUESTION # 97
......

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