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Docker DCA (Docker Certified Associate) is a certification exam that is designed to test the skills and knowledge of Docker professionals. Docker Certified Associate (DCA) Exam certification exam is offered by Docker, Inc. and is intended for individuals who work with Docker on a regular basis. DCA Exam covers topics such as Docker installation and configuration, Docker networking, Docker security, and more.

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Docker DCA Certification is a valuable credential for professionals who work with Docker. It demonstrates that the individual has a strong understanding of Docker and is capable of effectively using Docker to develop, deploy, and manage applications. Docker Certified Associate (DCA) Exam certification can be a valuable asset for individuals who are seeking new job opportunities or looking to advance their careers.

Docker Certified Associate (DCA) Exam Sample Questions (Q142-Q147):

NEW QUESTION # 142
When seven managers are in a swarm cluster how would they be distributed across three datacenters or availability zones?

A. 4-2-1
B. 5-1-1
C. 3-3-1
D. 3-2-2

Answer: A

NEW QUESTION # 143
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 # 144
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
Namespaces in Kubernetes are a way to create and organize virtual clusters within physical clusters where we can isolate a group of resources within a single cluster1. Namespace helps to organize resources such as pods, services, and volumes within the cluster2. By creating one namespace for each application and adding all the resources to it, the development teams can ensure that Kubernetes-specific resources, such as secrets, are grouped together for each application. This also provides a scope for names, a mechanism to attach authorization and policy, and a way to divide cluster resources between multiple users3. References:
* Namespaces | Kubernetes
* Kubernetes - Namespaces - GeeksforGeeks
* Namespaces Walkthrough | Kubernetes

NEW QUESTION # 145
Does this describe the role of Control Groups (cgroups) when used with a Docker container?
Solution: user authorization to the Docker API

A. No
B. Yes

Answer: A

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.
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.

NEW QUESTION # 146
Is this a type of Linux kernel namespace that provides container isolation?
Solution: Authentication

A. No
B. Yes

Answer: A

Explanation:
= Authentication is not a type of Linux kernel namespace that provides container isolation. Namespaces are a feature of the Linux kernel that partitions kernel resources such that one set of processes sees one set of resources and another set of processes sees a different set of resources. Docker uses six different namespaces to isolate containersfrom the host and from each other: PID, USER, UTS, IPC, MNT, and NET12. Authentication is not one of them. Authentication is a process of verifying the identity of a user or a system, which is usually done by using credentials such as passwords, tokens, or certificates. Authentication does not directly affect the isolation of containers, although it can be used to control access to them. Reference:
Docker security | Docker Docs
Securing Docker Containers with Linux Kernel Features | Infosec

NEW QUESTION # 147
......

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