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Individuals who earn the DCA certification demonstrate that they possess the technical knowledge and skills required to run containerized applications using Docker. Docker Certified Associate (DCA) Exam certification exam covers a range of topics, including Docker basics, Docker image creation and management, Docker networking, Docker security, and Docker storage management. Candidates also need to possess an understanding of the Docker architecture, Docker command-line interface (CLI), Docker Compose, and Docker swarm mode.

The DCA Exam covers a broad range of topics related to Docker, including containerization, image creation and management, orchestration, networking, security, and storage. Candidates are expected to be proficient in the use of Docker tools and technologies such as Docker Engine, Docker Compose, Docker Swarm, and Docker Hub. They are also expected to have a solid understanding of how Docker integrates with other technologies and platforms, such as Kubernetes, AWS, and Azure.

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Docker Certified Associate (DCA) Exam Sample Questions (Q81-Q86):

NEW QUESTION # 81
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker network create -d overlay -o encrypted=true <network-name>

A. No
B. Yes

Answer: B

Explanation:
The command docker network create -d overlay -o encrypted=true <network-name> will ensure that overlay traffic between service tasks is encrypted. This command creates an overlay network with the encryption option enabled, which means that Docker will create IPSEC tunnels between all the nodes where tasks are scheduled for services attached to the overlay network. These tunnels use the AES algorithm in GCM mode and manager nodes automatically rotate the keys every 12 hours1. This way, the data exchanged between containers on different nodes on the overlay network is secured. References:
* Overlay network driver

NEW QUESTION # 82
Does this command create a swarm service that only listens on port 53 using the UDP protocol?
Solution: 'docker service create -name dns-cache -p 53:53 -service udp dns-cache'

A. Yes
B. No

Answer: B

Explanation:
Explanation
This command does not create a swarm service that only listens on port 53 using the UDP protocol, because it has several syntax errors and missing options. According to the official documentation, the correct command should be:
docker service create --name dns-cache -p 53:53/udp --mode global dns-cache The errors and missing options are:
The --name flag is missing a dash (-).
The -p flag is missing the /udp suffix to specify the protocol.
The --service flag does not exist and should be replaced by --mode to specify the service mode.
The global option should follow the --mode flag to indicate that one task should run on each node.
References:
https://docs.docker.com/engine/reference/commandline/service_create/#publish-service-ports-externally-to-the-s
https://docs.docker.com/engine/reference/commandline/service_create/#specify-service-mode-mode
https://docs.docker.com/engine/reference/commandline/service_create/#options

NEW QUESTION # 83
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. No
B. Yes

Answer: B

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 # 84
Will this configuration achieve fault tolerance for managers in a swarm?
Solution: only two managers, one active and one passive.

A. Yes
B. No

Answer: B

NEW QUESTION # 85
You are running only Kubernetes workloads on a worker node that requires maintenance, such as installing patches or an OS upgrade.
Which command must be run on the node to gracefully terminate all pods on the node, while marking the node as unschedulable?

A. `kubectl cordon <node name>
B. `kubectl drain <node name>'
C. `docker node update -availability drain <node name>
D. `docker swarm leave'

Answer: B

Explanation:
Explanation
The command kubectl drain <node name> is the correct one to run on the node to gracefully terminate all pods on the node, while marking the node as unschedulable. This command will safely evict all the pods from the node before you perform maintenance on the node, such as installing patches or an OS upgrade1. It will respect the PodDisruptionBudgets you have specified, if any, and allow the pod's containers to gracefully terminate1. It will also mark the node as unschedulable, so that no new pods can be scheduled on the node until it is ready1.
The other commands are not correct because:
*docker swarm leave will make the node leave the swarm cluster, but it will not affect the Kubernetes workloads on the node2.
*docker node update -availability drain <node name> will change the availability of the node to drain, which means that no new tasks can be assigned to the node, but it will not terminate the existing pods on the node3.
*kubectl cordon <node name> will mark the node as unschedulable, but it will not evict the pods on the node4.
References:
*Safely Drain a Node | Kubernetes
*[docker swarm leave | Docker Docs]
*[docker node update | Docker Docs]
*[kubectl cordon | Kubernetes Docs]

NEW QUESTION # 86
......

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DCA Exam Discount Code- Realistic Valid DCA Test Prep Pass Success

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Docker Certified Associate (DCA) Exam Sample Questions (Q81-Q86):

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