Docker Certified Associate DCA Real Exam Questions and Answers FREE Updated on Aug 20, 2021

DCA Ultimate Study Guide -  TestSimulate

NEW QUESTION 39
A server is running low on disk space. What command can be used to check the disk usage of images, containers, and volumes for Docker engine?

• A. 'docker system free'
• B. 'docker system prune'
• C. 'docker system ps'
• D. 'docker system df'

Answer: D

 

NEW QUESTION 40
Which flag for a service would allow a container to consume more than 2 GB of memory only when there is no memory contention but would also prevent a container from consuming more than 4GB of memory, in any case?

• A. --memory-swap 4GB --limit-memory 2GB
• B. --limit-memory 2GB --reserve-memory 4GB
• C. --limit-memory 4GB --reserve-memory 2GB
• D. --memory-swap 2GB --limit-memory 4GB

Answer: D

 

NEW QUESTION 41
Can this set of commands identify the published port(s) for a container?
Solution: docker container inspect', 'docker port'

• A. No
• B. Yes

Answer: B

 

NEW QUESTION 42
In the context of a swarm mode cluster, does this describe a node?
Solution: a virtual machine participating in the swarm

• A. No
• B. Yes

Answer: A

 

NEW QUESTION 43
Which of the following commands will ensure that overlay traffic between service tasks is encrypted?

• A. docker service create --network <network-name> --secure <service-name>
• B. docker network create -d overlay --secure <network-name>
• C. docker network create -d overlay -o encrypted=true <network-name>
• D. docker service create --network <network-name> --encrypted <service-name>

Answer: C

 

NEW QUESTION 44
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 logs deployment api

• A. No
• B. Yes

Answer: A

 

NEW QUESTION 45
The Kubernetes yaml shown below describes a clusterIP service.

Is this a correct statement about how this service routes requests?
Solution: Traffic sent to the IP of this service on port 8080 will be routed to port 80 in a random pod with the label aPP: nginx.

• A. No
• B. Yes

Answer: B

 

NEW QUESTION 46
Which statement is correct about cluster management in Docker Enterprise Edition 3.x?

• A. Clusters can contain Linux, Windows Server 2016 and 2019, and Linux on IBM z Systems.
• B. Clusters can contain Linux only.
• C. Clusters can contain Windows 10 and Windows Server 2016 only.
• D. Clusters can contain Linux and Windows Server 2008 R2 only.

Answer: C

 

NEW QUESTION 47
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

 

NEW QUESTION 48
When using the Docker client to push an image to a registry, what environment variable is used to instruct the client to perform signing of the image?

• A. DOCKER_CONTENT_TRUST=1
• B. NOTARY_ENABLE=1
  Correct
• C. DOCKER_PUSH_SIGN=1
• D. DOCKER_IMAGE_SIGN=1

Answer: A

 

NEW QUESTION 49
You set up an automatic pruning policy on a DTR repository to prune all images using Apache licenses. What effect does this have on images in this repository?

• A. Matching Images are untagged during the next prune job.
• B. Matching images are deleted during the next prune Job.
• C. Matching images are untagged once they are older than the pruning threshold set in the repository's Settings tab.
• D. Matching images are untagged during the next prune job, and subsequently deleted once they are older than the pruning threshold set in the repository's Settings tab.

Answer: C

 

NEW QUESTION 50
The following Docker Compose file is deployed as a stack:

Is this statement correct about this health check definition?
Solution: Health checks test for app health ten seconds apart. Three failed health checks transition the container into "unhealthy" status.

• A. No
• B. Yes

Answer: B

 

NEW QUESTION 51
Which of the following is true about overlay networks?

• A. Overlay networks are only created on the manager nodes.
• B. Overlay networks are created only on the manager node that you created the overlay networking on
• C. Overlay networks are created on all cluster nodes when you create the overlay network.
• D. Overlay networks are first created on the manager nodes. Then they are created on the worker nodes once a task is scheduled on the specific worker node.

Answer: C

Explanation:
Explanation

 

NEW QUESTION 52
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. No
• B. Yes

Answer: A

 

NEW QUESTION 53
One of several containers in a pod is marked as unhealthy after failing its livenessProbe many times. Is this the action taken by the orchestrator to fix the unhealthy container?
Solution: Kubernetes automatically triggers a user-defined script to attempt to fix the unhealthy container.

• A. No
• B. Yes

Answer: A

 

NEW QUESTION 54
Is this a supported user authentication method for Universal Control Plane?
Solution: PAM

• A. No
• B. Yes

Answer: A

 

NEW QUESTION 55
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 describe deployment api

• A. No
• B. Yes

Answer: B

 

NEW QUESTION 56
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