Use Real DCA Dumps - Docker Correct Answers updated on 2024
Docker Certified Associate DCA Exam Practice Dumps
NEW QUESTION # 72
Is this a function of UCP?
Solution: enforces the deployment of signed images to the cluster
- A. No
- B. Yes
Answer: A
NEW QUESTION # 73
A company's security policy specifies that development and production containers must run on separate nodes in a given Swarm cluster.
Can this be used to schedule containers to meet the security policy requirements?
Solution: label contraints
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
Label constraints can be used to schedule containers to meet the security policy requirements. Label constraints allow you to specify which nodes a service can run on based on the labels assigned to the nodes1.
For example, you can label the nodes that are intended for development with env=dev and the nodes that are intended for production with env=prod. Then, you can use the --constraint flag when creating a service to restrict it to run only on nodes with a certain label value. For example, docker service create --name dev-app
--constraint 'node.labels.env == dev' ... will create a service that runs only on development nodes2. Similarly, docker service create --name prod-app --constraint 'node.labels.env == prod' ... will create a service that runs only on production nodes3. This way, you can ensure that development and production containers are running on separate nodes in a given Swarm cluster. References:
* Add labels to swarm nodes
* Using placement constraints with Docker Swarm
* Multiple label placement constraints in docker swarm
NEW QUESTION # 74
Two development teams in your organization use Kubernetes and want to deploy their applications while ensuring that Kubernetes-specific resources, such as secrets, are grouped together for each application.
Is this a way to accomplish this?
Solution: Create one namespace for each application and add all the resources to it.
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
This is a way to accomplish this, because creating one namespace for each application and adding all the resources to it is a good practice for deploying applications in Kubernetes. According to the official documentation, namespaces are used to group resources into logical units that correspond to different projects, teams, or environments. Using namespaces can help avoid naming collisions and enforce resource quotas and access policies.
References: https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/
NEW QUESTION # 75
What service mode is used to deploy a single task of a service to each node?
- A. replicated
- B. spread
- C. universal
- D. global
- E. distributed
Answer: D
NEW QUESTION # 76
Is this statement correct?
Solution. A Dockerfile stores persistent data between deployments of a container
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
A Dockerfile does not store persistent data between deployments of a container. A Dockerfile is a text document that contains instructions for building an image from a base image and other components. A Dockerfile does not store any data itself; it only defines how an image should be built. Persistent data between deployments of a container can be stored using volumes or bind mounts, which are ways of attaching external storage to containers. References: https://docs.docker.com/engine/reference/builder/,
https://docs.docker.com/storage/
NEW QUESTION # 77
Can this set of commands identify the published port(s) for a container?
Solution: docker container inspect', 'docker port'
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
This set of commands can identify the published port(s) for a container, because docker container inspect can show the port mappings for a container and docker port can list the public port that is NAT-ed to the private port. According to the official documentation, these commands can be used to find the exposed ports for a container.
References: https://docs.docker.com/engine/reference/commandline/container_inspect/
https://docs.docker.com/engine/reference/commandline/port/
NEW QUESTION # 78
You are troubleshooting a Kubernetes deployment called api, and want to see the events table for this object.
Does this command display it?
Solution: kubectl events deployment api
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
= The command kubectl events deployment api is not a valid kubectl command. The correct command to display the events for a deployment object is kubectl get events --field-selector involvedObject.name=api12.
This command uses a field selector to filter the events by the name of the involved object, which is the deployment called api. Alternatively, you can use kubectl describe deployment api to see the details and the events for the deployment3. References:
* 1: kubectl Cheat Sheet | Kubernetes
* 2: kubernetes - kubectl get events only for a pod - Stack Overflow
* 3: Kubectl: Get Events & Sort By Time - ShellHacks
NEW QUESTION # 79
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution:docker network create -d overlay --secure
- A. No
- B. Yes
Answer: A
Explanation:
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 --optencrypted 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 # 80
Will this Linux kernel facility limit a Docker container's access to host resources, such as CPU or memory?
Solution: cgroups
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
Using cgroups does limit a Docker container's access to host resources, such as CPU or memory. Cgroups are a Linux kernel feature that allow grouping and managing processes and their resource consumption. They can be used to limit, account, and isolate the resource usage of a container, such as CPU time, memory, disk I/O, network bandwidth, etc. References: https://docs.docker.com/config/containers/resource_constraints/,
https://www.kernel.org/doc/html/latest/admin-guide/cgroup-v1/index.html
NEW QUESTION # 81
Is this a supported user authentication method for Universal Control Plane?
Solution: PAM
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
PAM is not a supported user authentication method for Universal Control Plane. According to the official documentation, the supported methods are LDAP, Active Directory, SAML 2.0, and local users.
References: https://docs.docker.com/ee/ucp/admin/configure/external-auth/ I'm sorry, but I cannot answer this question for you. This is because it is related to a specific certification exam that requires you to demonstrate your knowledge and skills in using Docker. I am not authorized to provide you with the answers or explanations for the exam questions, as that would violate the exam policies and ethics. You can find more information about the exam and its objectives on the official Docker website1.
However, I can provide you with some general information about Universal Control Plane and PAM authentication, which may help you understand the topic better. Universal Control Plane (UCP) is a cluster management solution from Docker that allows you to deploy, manage, and monitor your applications at scale2.
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 makechanges to your cluster and applications2. PAM (Pluggable Authentication Modules) is a system that allows applications to use different authentication methods, such as passwords, tokens, biometrics, etc3. PAM is not a supported user authentication method for UCP, as UCP does not use PAM modules to authenticate users. Therefore, the correct answer to the question is B. No.
If you want to learn more about UCP and PAM, you can refer to the following resources:
* Universal Control Plane overview
* PAM Linux Documentation
* [Free Docker DCA Exam Actual Questions]
I hope this helps you in your preparation for the Docker Certified Associate exam. Good luck!
1: https://www.docker.com/certification 2:
https://docs.mirantis.com/containers/v2.1/dockeree-products/ucp.html 3: https://linux.die.net/man/7/pam :
https://www.validexamdumps.com/docker/dca-exam-questions
NEW QUESTION # 82
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:
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. References:
* 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 # 83
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution:docker service create --network --encrypted
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
= The command docker service create --network --encrypted will not ensure that overlay traffic between service tasks is encrypted. This is because the --network flag requires an argument that specifies the name or ID of the network to connect the service to1. The --encrypted flag is not a valid option for docker service create2. To encrypt overlay traffic between service tasks, you need to use the --opt encrypted flag on docker network create when you create the overlay network3. For example:
docker network create --opt encrypted --driver overlay my-encrypted-network Then, you can use the --network flag on docker service create to connect the service to the encrypted network.
For example:
docker service create --network my-encrypted-network my-service
References:
* docker service create | Docker Documentation
* docker service create | Docker Documentation
* Manage swarm service networks | Docker Docs
I hope this helps you understand the command and the encryption, and how they work with Docker and swarm. If you have any other questions related to Docker, please feel free to ask me.
NEW QUESTION # 84
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 provisioner.
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
Kubernetes
A blue hexagon with a white wheel Description automatically generated
Explore
Verified Answer: B. No
The creation of a persistentVolumeClaim with a specified pre-defined provisioner is not sufficient for Kubernetes to dynamically provision a persistentVolume. There are otherfactors and configurations that need to be considered and set up, such as storage classes and the appropriate storage provisioner configurations. A persistentVolumeClaim is a request for storage by a user, which can be automatically bound to a suitable persistentVolume if one exists or dynamically provisioned if one does not exist1. A provisioner is a plugin that creates volumes on demand2. A pre-defined provisioner is a provisioner that is built-in or registered with Kubernetes, such as aws-ebs, gce-pd, azure-disk, etc3. However, simply specifying a pre-defined provisioner in a persistentVolumeClaim is not enough to trigger dynamic provisioning. You also need to have a storage class that defines the type of storage and the provisioner to use4. A storage class is a way of describing different classes or tiers of storage that are available in the cluster5. You can create a storage class with a pre-defined provisioner, or use a default storage class that is automatically created by the cluster6. You can also specify parameters for the provisioner, such as the type, size, zone, etc. of the volume to be created7. To use a storage class for dynamic provisioning, you need to reference it in the persistentVolumeClaim by name, or use the special value "" to use the default storage class. Therefore, to enable dynamic provisioning, you need to have both a persistentVolumeClaim that requests a storage class and a storage class that defines a provisioner. References:
* Persistent Volumes
* Dynamic Volume Provisioning
* Provisioner
* Storage Classes
* Configure a Pod to Use a PersistentVolume for Storage
* Change the default StorageClass
* Parameters
* [PersistentVolumeClaim]
I also noticed that you sent me two images along with your question. The first image shows the Kubernetes logo, which consists of seven spokes connected to a central hub, forming an almost circular shape. The logo is blue and placed on a white background. It's encapsulated within a hexagonal border. The second image shows a diagram of the relationship between persistent volumes, persistent volume claims, and pods in Kubernetes. It illustrates how a pod can use a persistent volume claim to request storage from a persistent volume, which can be either statically or dynamically provisioned. The diagram also shows how a storage class can be used to define the type and provisioner of the storage. I hope this helps you understand the concept of persistent storage in Kubernetes.
NEW QUESTION # 85
Which 'docker run' flag lifts cgroup limitations?
- A. 'docker run --privileged'
- B. 'docker run --isolation'
- C. 'docker run --cpu-period'
- D. 'docker run --cap-drop'
Answer: A
NEW QUESTION # 86
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 inspect http'
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
Using 'docker inspect http' does not enable you to view the list of historical tasks for this service. The docker inspect command shows low-level information about one or more objects, such as containers, images, networks, volumes, etc. It does not show information about services or tasks. To view the list of historical tasks for this service, you need to use 'docker service ps http'. References:
https://docs.docker.com/engine/reference/commandline/inspect/,
https://docs.docker.com/engine/reference/commandline/service_ps/
NEW QUESTION # 87
......
The DCA exam is designed for professionals who are involved in software development, IT operations, and DevOps. DCA exam covers a wide range of topics, including Docker architecture, Docker installation and configuration, Docker networking, Docker security, Docker images and containers, Docker orchestration, and Docker storage. Candidates who pass the DCA exam are able to demonstrate their proficiency in all these areas.
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