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  2. Docker Certification
  3. DCA Exam
  4. Docker.DCA.v2025-07-01.q110 Dumps
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Question 96

You add a new user to the engineering organization in DTR.
Will this action grant them read/write access to the engineering/api repository?
Solution: Add the user directly to the list of users with read/write access under the repository's Permissions tab.

Correct Answer: A
Explanation
This action will grant them read/write access to the engineering/api repository, because adding a user directly to the list of users with read/write access under the repository's Permissions tab is one way to grant permissions to a user in DTR. According to the official documentation, this is an example of using fine-grained permissions for a repository.
References: https://docs.docker.com/ee/dtr/user/manage-repos/permission-levels/
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Question 97

The Kubernetes yaml shown below describes a networkPolicy.

Will the networkPolicy BLOCK this trafftc?
Solution. a request issued from a pod bearing only the tier: frontend label, to a pod bearing the tier: backend label

Correct Answer: A
The provided Kubernetes NetworkPolicy YAML configuration indicates that the policy applies to pods with the label tier: backend in the default namespace1.The ingress rule allows traffic from pods with the label tier: api1.Therefore, a request issued from a pod bearing only the tier:frontend label to a pod bearing the tier: backend label will be blocked by this networkPolicy1.This is because the networkPolicy does not have a rule allowing ingress from pods with the tier: frontend label1. For more information on Kubernetes NetworkPolicies, you can refer to theKubernetes Documentation on Network Policies.
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Question 98

Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution: Uninstall 'docker-ce' package before installing 'docker-ee' package.

Correct Answer: B
= Uninstalling the 'docker-ce' package before installing the 'docker-ee' package will not upgrade Docker Engine CE to Docker Engine EE. It will only remove the existing Docker Engine CE installation and install a new Docker Engine EE installation. This means that any existing containers, images, volumes, networks, and other Docker resources will be lost. To upgrade Docker Engine CE to Docker Engine EE without losing any data, youneed to use the migration tool provided by Docker1 or follow the steps described in the Docker documentation2 or other online guides34. Reference:
1: Migrate to Engine 1.10 | Docker Docs
2: Install Docker Engine | Docker Docs
3: Switching Docker 18.09 Community Edition to Enterprise Engine with no ...
4: How to upgrade Docker 18.09 Community Edition to Docker Enterprise 18.09
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Question 99

Will this command list all nodes in a swarm cluster from the command line?
Solution: 'docker node Is'

Correct Answer: A
= (Please check the official Docker site for the comprehensive explanation) References: (Some possible references from the web search results are)
* [Docker Swarm Tutorial: Manage Multiple Docker Hosts - Edureka]
* [Docker Swarm - Docker Documentation]
* [Docker Swarm Tutorial: How to Manage Multiple Docker Hosts - Linux Hint]
* [Docker Swarm Tutorial: How to Manage Multiple Docker Hosts - YouTube]
* [Docker Swarm Tutorial: How to Manage Multiple Docker Hosts - Medium] I hope this helps you in your exam preparation. Good luck!
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Question 100

Does this describe the role of Control Groups (cgroups) when used with a Docker container?
Solution: user authorization to the Docker API

Correct Answer: B
= The role of Control Groups (cgroups) when used with a Docker container is not user authorization to the Docker API. Cgroups are a feature of the Linux kernel that allow you to limit the access processes and containers have to system resources such as CPU, RAM, IOPS and network1. Cgroups enable Docker to share available hardware resources to containers and optionally enforce limits and constraints2. User authorization to the Docker API is a different concept that involves granting permissions to users or groups to perform certain actions on the Docker daemon, such as creating, running, or stopping containers3.
References:
* Lab: Control Groups (cgroups) | dockerlabs
* Runtime metrics | Docker Docs
* Authorize users to access the Docker API | Docker Docs
I hope this helps you understand the role of cgroups and how they work with Docker containers. If you have any other questions related to Docker, please feel free to ask me.
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