Docker Docker Certified Associate DCA Questions & Answers

• Question 121:

  What behavior is expected when a service is created with the following command: 'docker service create --publish 8000:80 nginx'

  A. All nodes in the cluster will listen on port 8080 and forward to port 80 in the container.

  B. Only a single node in the cluster will listen on port 8080 and forward to port 80 in the container.

  C. All nodes in the cluster will listen on port 80 and forward to port 8080 in the container.

  D. Only a single node in the cluster will listen on port 80 and forward to port 8080 in the container.

  Correct Answer: A

• Question 122:

  Which of these swarm manager configurations will cause the cluster to be in a lost quorum state?

  A. 4 managers of which 2 are healthy

  B. 1 manager of which 1 is healthy

  C. 3 managers of which 2 are healthy

  D. 5 managers of which 3 are healthy

  Correct Answer: A

• Question 123:

  Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?

  Solution: user

  A. Yes

  B. No

  Correct Answer: A

• Question 124:

  Which of the following is required to install Docker EE from a package repository?

  A. Repository URL obtained from Docker Store

  B. License key obtained from Docker Store

  C. Repository URL obtained from Docker Hub

  D. License key obtained from Docker Hub

  Correct Answer: A

• Question 125:

  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'

  Correct Answer: A

• Question 126:

  Seven managers are in a swarm cluster.

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

  Solution: 5-1-1

  A. Yes

  B. No

  Correct Answer: B

• Question 127:

  You have just executed 'docker swarm leave' on a node. What command can be run on the same node to confirm it has left the cluster?

  A. docker node ls

  B. docker system info

  C. docker system status

  D. docker system status

  Correct Answer: B

• Question 128:

  A container named "analytics" that stores results in a volume called "data" was created.

  docker run -d --name=analytics -v data:/data app1

  How are the results accessed in "data" with another container called "app2"?

  A. docker run -d --name=reports --volume=data app2

  B. docker run -d --name=reports --volumes-from=analytics app2

  C. docker run -d --name=reports --volume=app1 app2

  D. docker run -d --name=reports --mount=app1 app2

  Correct Answer: B

• Question 129:

  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. Yes

  B. No

  Correct Answer: A

• Question 130:

  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. Faster image builds by allowing parallel execution of Docker builds

  Correct Answer: B