Docker Certified Associate (DCA) Practice Questions: Orchestration Domain

Docker Certified Associate (DCA) Practice Questions

Master the Orchestration Domain

Test your knowledge in the Orchestration domain with these 5 practice questions. Each question is designed to help you prepare for the DCA certification exam with detailed explanations to reinforce your learning.

Question 1

Which of the following commands would you use to update an existing service to use a new image version in a Docker Swarm?

A) docker service update --image newimage:tag servicename

B) docker service refresh --image newimage:tag servicename

C) docker service upgrade servicename newimage:tag

D) docker service change --image newimage:tag servicename

Show Answer & Explanation

Correct Answer: A

Explanation: To update a service to use a new image version, you use the 'docker service update --image newimage:tag servicename' command. Option B is incorrect because 'docker service refresh' is not a valid command. Option C is incorrect because 'docker service upgrade' is not a valid command. Option D is incorrect because 'docker service change' is not a valid command.

Question 2

You need to ensure that a Docker service is always restarted if it crashes, but not if it exits cleanly. Which restart policy should you use?

A) no

B) on-failure

C) always

D) unless-stopped

Show Answer & Explanation

Correct Answer: B

Explanation: The 'on-failure' restart policy will restart the container only if it exits with a non-zero status, which usually indicates a crash. The 'no' policy will not restart the container under any circumstances. The 'always' policy will restart the container regardless of the exit status, and 'unless-stopped' will behave like 'always' unless the container is stopped manually.

Question 3

Which of the following commands can be used to view the tasks of a specific service in a Docker Swarm?

A) docker service inspect

B) docker service ps

C) docker ps --filter service=

D) docker service logs

Show Answer & Explanation

Correct Answer: B

Explanation: The 'docker service ps ' command is used to view the tasks of a specific service in a Docker Swarm. It shows the status of each task and which node it is running on. Option A is incorrect because 'docker service inspect' provides detailed information about the service configuration, not the tasks. Option C is incorrect because 'docker ps --filter service=' is used to filter running containers, not tasks in a swarm service. Option D is incorrect because 'docker service logs' is used to view logs for a service, not to list its tasks.

Question 4

You have a Docker Swarm cluster running with 5 manager nodes and 10 worker nodes. One of the manager nodes fails. What will happen to the cluster?

A) The cluster will stop functioning as a majority of managers are required.

B) The cluster will continue to function without any disruption.

C) The cluster will automatically promote a worker node to a manager node.

D) All services running on the failed manager node will be lost.

Show Answer & Explanation

Correct Answer: B

Explanation: In a Docker Swarm cluster, a majority of manager nodes are required to maintain quorum. With 5 manager nodes, a majority is 3, so losing one manager node does not affect the quorum, and the cluster continues to function normally. Option A is incorrect because the cluster does not require all managers, just a quorum. Option C is incorrect because Docker Swarm does not automatically promote workers to managers. Option D is incorrect because services are distributed and managed across the cluster, not tied to individual manager nodes.

Question 5

In Docker Swarm, what does the 'replicated' service mode signify?

A) The service runs on a single node only

B) The service is duplicated across all nodes

C) The service runs a specified number of identical tasks

D) The service is automatically scaled based on load

Show Answer & Explanation

Correct Answer: C

Explanation: The 'replicated' service mode in Docker Swarm signifies that the service runs a specified number of identical tasks across the swarm. Option A is incorrect because 'replicated' does not limit the service to a single node. Option B is incorrect because 'replicated' does not mean duplication across all nodes, only a specified number. Option D is incorrect because automatic scaling based on load is not a feature of the 'replicated' mode.

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About DCA Certification

The DCA certification validates your expertise in orchestration and other critical domains. Our comprehensive practice questions are carefully crafted to mirror the actual exam experience and help you identify knowledge gaps before test day.

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