The Best Valid DCA Dumps for Helping Passing DCA Exam!

UPDATED Docker DCA Exam Questions & Answer

The DCA certification exam was created by Docker, Inc., the company behind the Docker platform, and is administered by Pearson VUE, a leading provider of computer-based testing. Docker Certified Associate (DCA) Exam certification is valid for two years from the date of issue, after which candidates must recertify to maintain their certification status.

 

NEW QUESTION # 99
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker network create -d overlay --secure

• A. Yes
• B. No

Answer: B

Explanation:
= I cannot give you a comprehensive explanation, but I can tell you that the command is not correct. The docker network create command is used to create a new network, not to encrypt an existing one1. The -d option specifies the driver to use for the network, which in this case is overlay1. The overlay driver enables multi-host networking for swarm services2. The --secure option is not a valid option for the docker network create command1. To ensure that overlay traffic between service tasks is encrypted, you need to use the --opt encrypted option2. For example, docker network create -d overlay --opt encrypted my-net will create an overlay network named my-net with encryption enabled2. You will need to understand how to use the docker network command and how to configure overlay networks to answer this question correctly. References:
* Docker network create command documentation: 1
* Overlay network encryption documentation: 2
I hope this helps you prepare for your DCA exam. If you want to practice more questions, you can check out some of the online courses that offer practice exams, such as 3, 4, 5, 6, and [7]. Good luck!

NEW QUESTION # 100
Is this statement correct?
Solution: A Dockerfile stores the Docker daemon's configuration options.

• A. Yes
• B. No

Answer: B

Explanation:
Explanation
The statement is not correct. A Dockerfile does not store the Docker daemon's configuration options. A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image1. A Dockerfile is used to build images, not to configure the Docker daemon. The Docker daemon's configuration options are stored in a JSON file, which is usually located at /etc/docker/daemon.json on Linux systems, or C:\ProgramData\docker\config\daemon.json on Windows2. The JSON file allows you to customize the Docker daemon's behavior, such as enabling debug mode, setting TLS certificates, or changing the data directory2. References: Dockerfile reference), Docker daemon configuration overview)

NEW QUESTION # 101
A users attempts to set the system time from inside a Docker container are unsuccessful. Could this be blocking this operation?
Solution: inter-process communication

• A. Yes
• B. No

Answer: B

Explanation:
(Please check the official Docker site for the answer) Comprehensive= (Please check the official Docker site for the comprehensive explanation) Reference: (Some possible references from the web search results are) Docker Security - Docker Documentation Docker Security Best Practices - Medium Docker Security Cheat Sheet - GitHub Docker Security: A Comprehensive Guide - Snyk Docker Security: Tips and Tricks to Secure Your Containers - DevSecOps I hope this helps you in your exam preparation. Good luck!

NEW QUESTION # 102
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. No
• B. Yes

Answer: B

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 # 103
In Docker Trusted Registry, is this how a user can prevent an image, such as 'nginx:latest', from being overwritten by another user with push access to the repository?
Solution: Keep a backup copy of the image on another repository.

• A. Yes
• B. No

Answer: B

Explanation:
= Keeping a backup copy of the image on another repository is not how a user can prevent an image, such as 'nginx:latest', from being overwritten by another user with push access to the repository. This approach does not prevent the original image from being overwritten, it only provides a way to restore it from another source. However, this may not be reliable or efficient, as the backup repository may not be in sync with the original one, or may not be accessible at all times. To prevent an image from being overwritten by another user, the user can use the DTR web UI to make the tag immutable1. This feature allows the user to lock a specific tag, so that no one can push a new image with the same tag to the repository. This ensures that the image is always consistent and secure1. Reference:
Make a tag immutable | Docker Docs

NEW QUESTION # 104
Does this command display all the pods in the cluster that are labeled as 'env: development'?
Solution: 'kubectl get pods -I env=development'

• A. No
• B. Yes

Answer: B

NEW QUESTION # 105
You want to create a container that is reachable from its host's network. Does this action accomplish this?
Solution:Use either EXPOSE or --publish to access the containers on the bridge network

• A. Yes
• B. No

Answer: B

Explanation:
The answer depends on whether you want to access the container from the host's network or from other containers on the same network. EXPOSE and --publish have different effects on the container's port visibility. Reference: Docker run reference, Dockerfile reference, Docker networking overview

NEW QUESTION # 106
Does this describe the role of Control Groups (cgroups) when used with a Docker container?
Solution: user authorization to the Docker API

• A. Yes
• B. No

Answer: B

Explanation:
= 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.
:
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.

NEW QUESTION # 107
In the context of a swarm mode cluster, does this describe a node?
Solution: an instance of the Docker engine participating in the swarm

• A. No
• B. Yes

Answer: B

NEW QUESTION # 108
In the context of a swarm mode cluster, does this describe a node?
Solution: an instance of the Docker engine participating in the swarm

• A. No
• B. Yes

Answer: B

Explanation:
In the context of a swarm mode cluster, an instance of the Docker engine participating in the swarm is indeed a node1. A node can be either a manager or a worker, depending on the role assigned by the swarm manager2. A manager node handles the orchestration and management of the swarm, while a worker node executes the tasks assigned by the manager2. A node can join or leave a swarm at any time, and the swarm manager will reconcile the desired state of the cluster accordingly1. Reference:
1: Swarm mode overview | Docker Docs
2: Manage nodes in a swarm | Docker Docs

NEW QUESTION # 109
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. Mirror the engineering/api repository to one of the user's own private repositories.

• A. Yes
• B. No

Answer: B

Explanation:
= Mirroring the engineering/api repository to one of the user's own private repositories will not grant them read/write access to the original repository. Mirroring is a feature that allows users to automatically sync images from one repository to another, either within the same DTR or across different DTRs. Mirroring does not affect the permissions or roles of the users or teams associated with the source or destination repositories. To grant a user read/write access to the engineering/api repository, the user needs to be added to a team that has the appropriate role for that repository, or the repository needs to be configured with the appropriate visibility and access settings. Reference:
Mirror repositories
Manage access to repositories
Manage teams

NEW QUESTION # 110
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. Yes
• B. No

Answer: B

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 # 111
You configure a local Docker engine to enforce content trust by setting the environment variable DOCKER_C0NTENT_TRUST=l. If myorg/myimage: 1.0 is unsigned, does Docker block this command?
Solution. docker image build, from a Dockeflle that begins FROM myorg/myimage: l1.0

• A. No
• B. Yes

Answer: B

Explanation:
Explanation
Docker blocks this command if you configure a local Docker engine to enforce content trust by setting the environment variable DOCKER_CONTENT_TRUST=1 and if myorg/myimage:1.0 is unsigned. Content trust is a feature that allows you to use digital signatures to verify the integrity and publisher of specific image tags.
When you enable content trust, you can only pull, run, or build with trusted images. If an image tag is unsigned, Docker will block any command that attempts to use it. This includes docker image build, from a Dockerfile that begins FROM myorg/myimage:1.0, if myorg/myimage:1.0 is unsigned. References:
https://docs.docker.com/engine/security/trust/,
https://docs.docker.com/engine/reference/commandline/image_build/

NEW QUESTION # 112
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution: Manually download the 'docker-ee' package

• A. Yes
• B. No

Answer: B

Explanation:
= Manually downloading the 'docker-ee' package will not upgrade Docker Engine CE to Docker Engine EE.
Docker Engine CE and Docker Engine EE are two different products with different installation methods and features. Docker Engine CE is a free and open source containerization platform, while Docker Engine EE is a subscription-based enterprise-grade platform that offers additional features such as security scanning, certified plugins, and support12. To upgrade from Docker Engine CE to Docker Engine EE, you need to uninstall Docker Engine CE and install Docker Engine EE following the official documentation3. References:
* What is the exact difference between Docker EE (Enterprise Edition), Docker CE (Community Edition) and Docker (Custom Support) - Stack Overflow
* Difference between Docker Community Edition (CE) vs Docker Enterprise Edition (EE) in 2020
* Install Docker Engine | Docker Docs

NEW QUESTION # 113
Is this the purpose of Docker Content Trust?
Solution: Enable mutual TLS between the Docker client and server.

• A. Yes
• B. No

Answer: B

NEW QUESTION # 114
Is this a type of Linux kernel namespace that provides container isolation?
Solution.Host

• A. Yes
• B. No

Answer: B

Explanation:
Explanation
= Host is not a type of Linux kernel namespace that provides container isolation. Linux namespaces are a feature of the Linux kernel that partitions kernel resources such that one set of processes sees one set of resources while another set of processes sees a different set of resources1. There are eight kinds of namespaces available: Mount, Process, User, Network, UTS, IPC, Cgroup, and Time1. Host is a parameter that can be used to run a container in the host's network namespace, which means the container shares the same network interfaces and configuration as the host2. References:
* Linux namespaces - Wikipedia
* Network settings | Docker Documentation

NEW QUESTION # 115
Is this a function of UCP?
Solution: image role-based access control

• A. Yes
• B. No

Answer: B

Explanation:
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 # 116
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Docker Certified Associate (DCA) exam is a professional certification program that validates the skills and knowledge of individuals in the field of Docker technology. Docker Certified Associate (DCA) Exam certification is offered by Docker, which is an open platform for developing, shipping, and running distributed applications. The DCA certification program is designed to help IT professionals demonstrate their proficiency in Docker technology and gain recognition in the industry.

The DCA Exam is recognized by the industry as a valuable certification for IT professionals who work with Docker. Employers look for candidates who hold the DCA credential as it demonstrates their knowledge and skills in Docker. Docker Certified Associate (DCA) Exam certification is also beneficial for IT professionals who want to advance their careers in DevOps, cloud computing, and containerization. The DCA Exam is a valuable investment for IT professionals who want to enhance their skills and demonstrate their expertise in Docker.

 

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