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Docker Certified Associate (DCA) certification exam is a valuable credential for IT professionals and developers who work with Docker technologies. It validates their knowledge and skills in using Docker to build, ship, and run containerized applications. Docker Certified Associate (DCA) Exam certification can help professionals to enhance their career prospects and to demonstrate their expertise in Docker technologies to potential employers.

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The DCA Exam covers a broad range of topics related to Docker, including containerization, image creation and management, orchestration, networking, security, and storage. Candidates are expected to be proficient in the use of Docker tools and technologies such as Docker Engine, Docker Compose, Docker Swarm, and Docker Hub. They are also expected to have a solid understanding of how Docker integrates with other technologies and platforms, such as Kubernetes, AWS, and Azure.

Docker Certified Associate (DCA) Exam Sample Questions (Q131-Q136):

NEW QUESTION # 131
The Kubernetes yaml shown below describes a clusterIP service.

Is this a correct statement about how this service routes requests?
Solution: Traffic sent to the IP of this service on port 8080 will be routed to port 80 in a random pod with the label aPP: nginx.

A. No
B. Yes

Answer: B

NEW QUESTION # 132
Will this command mount the host's '/data' directory to the ubuntu container in read-only mode?
Solution: 'docker run --add-volume /data /mydata -read-only ubuntu'

A. No
B. Yes

Answer: A

Explanation:
n: = Using the DTR web UI to make all tags in the repository immutable is not a good way to prevent an image, such as 'nginx:latest', from being overwritten by another user with push access to the repository. This is because making all tags immutable would prevent any updates to the images in the repository, which may not be desirable for some use cases. For example, if a user wants to push a new version of 'nginx:latest' with a security patch, they would not be able to do so if the tag is immutable. A better way to prevent an image from being overwritten by another user is to use the DTR web UI to create a promotion policy that restricts who can push to a specific tag or repository1. Alternatively, the user can also use the DTR API to create a webhook that triggers a custom action when an image is pushed to a repository2. References:
* Prevent tags from being overwritten | Docker Docs
* Create webhooks | Docker Docs

NEW QUESTION # 133
Is this statement correct?
Solution. A Dockerfile stores persistent data between deployments of a container

A. No
B. Yes

Answer: A

Explanation:
= A Dockerfile does not store persistent data between deployments of a container. A Dockerfile is a text document that contains instructions for building a Docker image. A Docker image is a read-only template that defines the layers and configuration of a container. A Docker container is an isolated and ephemeral instance of a Docker image that runs on the Docker Engine. Docker containers are not meant to store persistent data, as any changes made to the container's filesystem are lost when the container is removed. To store persistent data between deployments of a container, you need to use volumes or bind mounts. Volumes and bind mounts are ways to attach external storage to a container, so that the data is preserved even if the container is deleted.
Volumes are managed by Docker and stored in a location on the host system that is independent of the container's lifecycle. Bind mounts are files or directories on the host system that are mounted into a container. References:
* Persist container data
* Dockerfile reference
* Docker MySQL Persistence
* Persist the DB
* Docker - Dockerfile, persist data with VOLUME

NEW QUESTION # 134
Will this sequence of steps completely delete an image from disk in the Docker Trusted Registry?
Solution.Delete the image and remove permissions to the repository in the 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 the image and removing permissions to the repository will only remove the image from the registry's user interface and prevent unauthorized access to it. However, the image data will still remain on the registry's storage backend until garbage collection is performed1. Garbage collection is a process that removes unused blobs (layers) from the registry's storage2. To run garbage collection, the registry must be stopped and the command bin/registry garbage-collect /etc/docker/registry/config.yml must be executed3. Alternatively, the registry can be configured to run garbage collection automatically at regular intervals4. References:
* Deleting images | Docker Documentation
* Garbage collection | Docker Documentation
* How to delete images from a private docker registry? | Stack Overflow
* Automating garbage collection | Docker Documentation

NEW QUESTION # 135
Is this the purpose of Docker Content Trust?
Solution: Verify and encrypt Docker registry TLS.

A. No
B. Yes

Answer: B

NEW QUESTION # 136
......

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