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Individuals who earn the DCA Certification demonstrate that they possess the technical knowledge and skills required to run containerized applications using Docker. Docker Certified Associate (DCA) Exam certification exam covers a range of topics, including Docker basics, Docker image creation and management, Docker networking, Docker security, and Docker storage management. Candidates also need to possess an understanding of the Docker architecture, Docker command-line interface (CLI), Docker Compose, and Docker swarm mode.

The DCA exam is a comprehensive test that covers a wide range of topics related to Docker technology. It consists of 55 multiple-choice questions, and candidates are given 90 minutes to complete the exam. DCA exam is designed to assess the candidate's ability to work with Docker in real-world scenarios, and it covers topics such as Docker architecture, Docker CLI, Docker networking, Docker Compose, Docker Swarm, and Docker security. Candidates who pass the DCA exam are considered Docker experts and are eligible to receive the DCA certification, which can help them stand out in the job market and advance their careers in the field of containerization and Docker technology.

Docker DCA Exam Syllabus Topics:

Topic
Details

Topic 1

Image Creation, Management, and Registry: This domain assesses cloud infrastructure administrators and focuses on building, managing, and optimizing Docker images. It involves working with Dockerfiles, tagging, and pruning images, as well as understanding image layering and registry usage. Candidates must demonstrate image creation from files, modifications to reduce layers, and the ability to push, pull, and sign images. Registry configuration and management are also included, with tasks involving authentication, search, deletion, and secure access to stored images.

Topic 2

Domain 5: Security: This part of the exam focuses on the knowledge of cloud infrastructure administrators and addresses Docker security configurations and practices. It covers image signing, security scans, Docker Content Trust, and default engine protections. Candidates must configure RBAC settings within UCP, integrate identity systems such as LDAP or Active Directory, and manage UCP client bundles. Understanding MTLS, swarm security defaults, and UCP
DTR certificate usage is essential to meet the requirements of this domain.

Topic 3

Orchestration: This section of the exam measures the skills of DevOps engineers and covers the configuration and management of Docker Swarm clusters. It includes tasks such as setting up manager and worker nodes, converting containers into services, and manipulating stacks. Candidates must understand the role of templates, inspect and troubleshoot running services, and adjust service scaling and placement using node labels. The section also requires interpreting docker inspect outputs and handling communication between Dockerized applications and legacy systems, emphasizing the importance of quorum in cluster resilience.

Topic 4

Networking: This domain targets DevOps engineers and covers Docker networking fundamentals. It includes creating bridge and overlay networks, publishing ports, diagnosing connectivity issues, and understanding network driver types. Candidates are expected to comprehend the Container Network Model, configure external DNS, and apply HTTP
HTTPS load balancing techniques using Docker EE. Additional topics include evaluating traffic flow between Docker components and distinguishing between different port publishing modes like host and ingress.

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Docker Certified Associate (DCA) Exam Sample Questions (Q181-Q186):

NEW QUESTION # 181
Will This command list all nodes in a swarm cluster from the command line?
Solution. 'docker swarm nodes'

A. No
B. Yes

Answer: A

Explanation:
Explanation
= The command 'docker swarm nodes' is not a valid command to list all nodes in a swarm cluster from the command line. The correct command is docker node ls, which can be run on a manager node to view the details of all the nodes in the swarm1. The docker swarm command is used to manage the swarm itself, not the nodes. For example, you can use docker swarm init to create a new swarm, or docker swarm join to add a node to an existing swarm2. References:
* Manage nodes in a swarm | Docker Docs
* docker swarm | Docker Docs

NEW QUESTION # 182
Will a DTR security scan detect this?
Solution. private keys copied to the image

A. No
B. Yes

Answer: A

Explanation:
Explanation
A DTR security scan does not detect private keys copied to the image. A DTR security scan is a feature that scans images for known vulnerabilities in the software packages or dependencies that are installed in the image. A DTR security scan does not check for private keys or other sensitive data that may be accidentally or intentionally copied to the image. To avoid copying private keys to the image, you should use Docker secrets or other secure mechanisms to manage your credentials. References:
https://docs.docker.com/ee/dtr/user/manage-images/scan-images-for-vulnerabilities/,
https://docs.docker.com/engine/swarm/secrets/

NEW QUESTION # 183
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:
Deleting the image and the image repository from Docker Trusted Registry will not completely delete the image from disk. This is because deleting a repository or a tag only removes the reference to the image, but not the image itself. The image is still stored as a blob on the disk, and can be accessed by its digest1. To completely delete the image from disk, you need to enable the deletion feature in the registry configuration, and then use the API to delete the image by its manifest2. Alternatively, you can manually delete the image files from the registry storage directory, but this is not recommended3. After deleting the image, you also need to run the garbage collector to reclaim the disk space4. References:
* Docker Registry HTTP API V2
* How to delete images from a private docker registry?
* Remove docker image in registry by removing files/folders on server
* Garbage collection

NEW QUESTION # 184
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:
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 # 185
Is this statement correct?
Solution: A Dockerfile provides instructions for building a Docker image

A. Yes
B. No

Answer: A

Explanation:
Explanation
A Dockerfile is a text file that contains all the commands a user could run on the command line to create an image1. A Dockerfile is composed of instructions that specify the parent image, the packages to install, the files to copy, the ports to expose, and the commands to run2. A Dockerfile can be used to build a Docker image with the docker build command3. References:
* Dockerfile reference | Docker Docs
* What is a Dockerfile? A Step-by-Step Guide [2023 Updated] - Simplilearn
* How to Build Docker Images with Dockerfile | Linuxize

NEW QUESTION # 186
......

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