Free Docker DCA Exam Actual Questions

The questions for DCA were last updated On Mar 23, 2025

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Question No. 1

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 pod and add all the resources needed for each application

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Correct Answer: B

Creating one pod and adding all the resources needed for each application is not a good way to accomplish the goal of grouping Kubernetes-specific resources for each application.This is because pods are the smallest unit of a Kubernetes application, and they are designed to run a single container or a set of tightly coupled containers that share the same network and storage resources1. Pods are ephemeral and can be created and destroyed by the Kubernetes system at any time. Therefore, putting multiple applications in one pod would make them harder to manage, scale, and update independently.A better way to accomplish the goal is to use namespaces, which are logical clusters within a physical cluster that can isolate resources, policies, and configurations for different applications2.Namespaces can also help organize secrets, which are Kubernetes objects that store sensitive information such as passwords, tokens, and keys3.Reference:

Pods | Kubernetes

Namespaces | Kubernetes

Secrets | Kubernetes


Question No. 2

Will this command list all nodes in a swarm cluster from the command line?

Solution. 'docker inspect nodes

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Correct Answer: B

= The commanddocker inspect nodeswill not list all nodes in a swarm cluster from the command line.This command is invalid, asdocker inspectrequires one or more object names or IDs as arguments1.To list all nodes in a swarm cluster, you need to use thedocker node lscommand from a manager node2.This command will display the ID, hostname, status, availability, manager status, and engine version of each node in the swarm2.You can also use the-for--filterflag to filter the nodes by various criteria, such as role, label, or name2.Reference:

1: docker inspect | Docker Docs

2: docker node ls | Docker Docs


Question No. 3

Will this command ensure that overlay traffic between service tasks is encrypted?

Solution: docker network create -d overlay --secure

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Correct Answer: B

= 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.Reference:

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 as3,4,5,6, and [7]. Good luck!


Question No. 4

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

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Correct Answer: A

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 withenv=devand the nodes that are intended for production withenv=prod. Then, you can use the--constraintflag 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.Reference:

Add labels to swarm nodes

Using placement constraints with Docker Swarm

Multiple label placement constraints in docker swarm


Question No. 5

Seven managers are in a swarm cluster.

Is this how should they be distributed across three datacenters or availability zones?

Solution: 3-3-1

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Correct Answer: B

= Distributing seven managers across three datacenters or availability zones as 3-3-1 is not the best way to ensure high availability and fault tolerance. This is because if one of the datacenters with three managers fails, the remaining four managers will not have a quorum to elect a leader and continue the swarm operations.A quorum is the minimum number of managers that must be available to maintain the swarm state, and it is calculated as(N/2) + 1, where N is the total number of managers1. For seven managers, the quorum is five, so losing three managers will cause the swarm to lose the quorum.A better way to distribute seven managers across three datacenters or availability zones is 2-2-3, which will allow the swarm to survive the failure of any one datacenter2.Reference:

Administer and maintain a swarm of Docker Engines

Distribute manager nodes across multiple AZ


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