Exact2pass Docker-DCA

Docker
DCA
Docker Certified Associate (DCA) Exam
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[ Total Questions: 10]
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Exact Questions
Docker - DCA
Question #:1
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. --limit-memory 2GB --reserve-memory 4GB
B. --limit-memory 4GB --reserve-memory 2GB
C. --memory-swap 2GB --limit-memory 4GB
D. --memory-swap 4GB --limit-memory 2GB
Answer: C
Question #:2
Which of the following is true about overlay networks?
A. Overlay networks are created only on the manager node that you created the overlay
networking on
B. Overlay networks are created on all cluster nodes when you create the overlay network.
C. 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.
D. Overlay networks are only created on the manager nodes.
Answer: B
Explanation
Question #:3
What is the purpose of multi-stage builds?
A. Better logical separation of Dockerfile instructions for better readability
B. Optimizing images by copying artifacts selectively from previous stages
C. Better caching when building Docker images
D.
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Exact Questions
Docker - DCA
D. Faster image builds by allowing parallel execution of Docker builds
Answer: B
Question #:4
Which of the following is NOT backed up when performing a Docker Trusted backup operation?
A. Access control to repos and images
B. Repository metadata
C. Image blobs
D. DTR configurations
Answer: C
Question #:5
What is used by the kernel to Isolate resources when running Docker containers?
A. Namespaces
B. Overlay networks
C. Volumes
D. Control groups (also know as cgroups)
Answer: D
Question #:6
Which of the following constitutes a production-ready devicemapper configuration for the Docker engine?
A. Create a volume group in devicemapper and utilize the '--dm.thinpooldev' Docker daemon
option, specifying the volume group
B. Format a partition with xfs and mount it at '/var/lib/docker'
C. Utilize the '--storage-opt dm.directlvm_device' Docker daemon option, specifying a block
device
D. Nothing, devicemapper comes ready for production usage out of the box
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Exact Questions
Docker - DCA
Answer: C
Explanation
Question #:7
Which of the following statements is true about secrets?
A. Secrets can be created from any node in the cluster.
B. Secrets can be modified after they are created.
C. Secret are stored unencrypted on manager nodes.
D. Secrets can be created using standard input (STDIN) and a file.
Answer: D
Question #:8
Which set of commands can identify the publishd port(s) for a container? (Choose 1.)
A. 'docker port inspect', 'docker container inspect'
B. 'docker container inspect', docker port'
C. 'docker info','docker network inspect'
D. 'docker network inspect','docker port'
Answer: B
Question #:9
Which of the following commands wifi automatically create a volume when a container is started?
A. 'docker container run --name nginxtest --volumes=/app nginx'
B. 'docker container run --name nginxtest -v /app:mount nginx'
C. 'docker container run --name nginxtest --volumes myvol:/app:new nginx'
D. 'docker container run --name nginxtest -v myvol:/app nginx'
Answer: A
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Exact Questions
Docker - DCA
Question #:10
You have deployed a service to swarm. Which command uses the Docker CLI to set the number of tasks of the
services to 5? (choose 2)
A. 'docker service update --replicas=5 <service-id>'
B. 'docker replica update <service-id>=5'
C. 'docker update service <service-id>=5'
D. 'docker service replicas <service-id>=5'
E. 'docker service scale <service-id> = 5''
Answer: A E
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