DCA Exam Info and Free Practice Test Professional Quiz Study Materials [Q29-Q45]

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DCA Exam Info and Free Practice Test Professional Quiz Study Materials

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Q29. A users attempts to set the system time from inside a Docker container are unsuccessful. Could this be blocking this operation?
Solution: Linux capabilities

Yes

Q30. Will this command list all nodes in a swarm cluster from the command line?
Solution: ‘docker Is -a’

Yes

Q31. Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 5-1-1

Yes

Q32. When an application being managed by UCP fails, you would like a summary of all requests made to the UCP API in the hours leading up to the failure.
What must be configured correctly beforehand for this to be possible?

All engines in the cluster must have their log driver set to the metadata’ or request’ level.

UCP logging levels must be set to the info’ or debug’ level.

Set the logging level in theconfig object for the ucp-kube-api-server container to warning or higher.

UCP audit logs must be set to the metadata’ or request’ level.

Q33. Are these conditions sufficient for Kubernetes to dynamically provision a persistentVolume, assuming there are no limitations on the amount and type of available external storage?
Solution: A default provisioner is specified, and subsequently a persistentVolumeClaim is created.

Yes

Q34. What is the difference between a resource limit and a resource reservation when scheduling services?

A resource limit and a resource reservation can be used interchangeably.

A resource limit is a soft limit for your service, while a reservation is hard limit and the docker engine will do its best to keep your service at the limit.

A resource limit is used to find a host with adequate resources for scheduling a hard limit for your service, while a reservation is hard limit for your service.

A resource limit is hard limit for your service, while a reservation is used to find a host with adequate resources for scheduling. Correct

Q35. Is this a type of Linux kernel namespace that provides container isolation?
Solution: Network

Yes

Q36. Will this command display a list of volumes for a specific container?
Solution: docker container logs nginx –volumes’

Yes

Q37. What is the docker command to setup a swarm?

docker swarm init

docker swarm create

docker init swarm

docker create swarm

https://docs.docker.com/engine/reference/commandline/swarm/

Q38. Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 3-3-1

Yes

Q39. The following health check exists in a Dockerfile:
‘HEALTCHECK CMD curl –fail http://localhost/health || exit 1’
Which of the following describes its purpose?

Defines the action taken when container health fails, which in this case will kill the container with exit status 1

Defines the health check endpoint on the localhost interface for external monitoring tools to monitor the health of the docker engine.

Defines the health check endpoint on the local host interface for containers to monitor the health of the docker engine.

Defines the health check for the containerized application so that the application health can be monitored by the Docker engine

Q40. Will this sequence of steps completely delete an image from disk in the Docker Trusted Registry?
Solution: Delete the image and run garbage collection on the Docker Trusted Registry.

Yes

Q41. From a DevOps process standpoint, it is best practice to keep changes to an application in version control. Which of the following will allow changes to a docker Image to be stored in a version control system?

docker commit

docker save

A docker-compose.yml file

A dockerfile

Q42. Is this a type of Linux kernel namespace that provides container isolation?
Solution: Storage

Yes

Q43. Which statement is true?

CMD shell format uses this form [“param”, param”, “param”]

ENTRYPOINT cannot be used in conjuction with CMD

CMD is used to run the software is the image along with any arguments

ENTRYPOINT cannot be overriden in the “docker container run” command

Q44. 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.