Docker DCA Dumps Updated Dec 11, 2023 WIith 145 Questions
View All DCA Actual Free Exam Questions Dec 11, 2023 Updated
The DCA certification exam is a challenging test that requires candidates to have a deep understanding of Docker technologies and the ability to apply them in real-world scenarios. DCA exam is based on a set of industry-standard competencies, and passing it demonstrates a candidate's ability to meet these competencies. The DCA certification exam is a rigorous test that requires candidates to prepare thoroughly to ensure success.
NEW QUESTION # 14
Does this command display all the pods in the cluster that are labeled as 'env: development'?
Solution: 'kubectl get pods --all-namespaces -I env=development'
- A. No
- B. Yes
Answer: B
NEW QUESTION # 15
Is this the purpose of Docker Content Trust?
Solution: Verify and encrypt Docker registry TLS.
- A. No
- B. Yes
Answer: B
NEW QUESTION # 16
The output of which command can be used to find the architecture and operating system an image is
compatible with?
- A. docker image ls <image-id>
- B. docker image info <image-id>
- C. docker image inspect --filter {{.Architecture}} {{.OS}} ' <image-id>
- D. docker image inspect --format {{.Architecture}} {{.OS}} ' <image-id>
Answer: D
NEW QUESTION # 17
Is this the purpose of Docker Content Trust?
Solution: Enable mutual TLS between the Docker client and server.
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
Enabling mutual TLS between the Docker client and server is not the purpose of Docker Content Trust.
According to the official documentation, the purpose of Docker Content Trust is to verify the integrity and publisher of all data received from a registry over any channel.
References: https://docs.docker.com/engine/security/trust/content_trust/
NEW QUESTION # 18
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. If the test fails, the container will be restarted three times before it gets rescheduled.
- A. No
- B. Yes
Answer: A
NEW QUESTION # 19
You created a new service named 'http' and discover it is not registering as healthy. Will this command enable you to view the list of historical tasks for this service?
Solution: 'docker service ps http'
- A. No
- B. Yes
Answer: B
Explanation:
Explanation
Using 'docker service ps http' enables you to view the list of historical tasks for this service. The docker service ps command shows information about tasks associated with one or more services. A task is a slot where a container runs to execute a service's commands. A task can have different states in its lifecycle, such as new, running, complete, failed, etc. The docker service ps command shows all tasks by default, including historical ones. References: https://docs.docker.com/engine/reference/commandline/service_ps/,
https://docs.docker.com/engine/swarm/how-swarm-mode-works/services/
NEW QUESTION # 20
A persistentVolumeClaim (PVC) is created with the specification storageClass: "", and size requirements that cannot be satisfied by any existing persistentVolume.
Is this an action Kubernetes takes in this situation?
Solution: The PVC remains unbound until a persistentVolume that matches all requirements of the PVC becomes available.
- A. No
- B. Yes
Answer: B
NEW QUESTION # 21
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
Explanation:
Explanation
This command will not mount the host's '/data' directory to the ubuntu container in read-only mode, because it has several syntax errors and missing options. According to the official documentation, the correct command should be:
docker run --volume /data:/mydata:ro --read-only ubuntu
The errors and missing options are:
The --add-volume flag does not exist and should be replaced by --volume or -v to mount a host directory as a data volume.
The --volume flag requires a colon (:) to separate the host directory and the container directory, not a space.
The --read-only flag applies to the whole container's file system, not just the mounted volume. To make the volume read-only, a :ro suffix should be added to the --volume flag.
The ubuntu image name should be the last argument of the command.
References: https://docs.docker.com/engine/reference/commandline/run/#mount-volume-v-read-only
https://docs.docker.com/storage/volumes/#use-a-read-only-volume
NEW QUESTION # 22
Which one of the following commands will result in the volume being removed automatically once the container
has exited?
- A. 'docker run --rm -v /foo busybox'
- B. 'docker run --remove -v /foo busybox'
- C. 'docker run --del -v /foo busybox'
- D. 'docker run --read-only -v /foo busybox'
Answer: A
NEW QUESTION # 23
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. No
- B. Yes
Answer: A
NEW QUESTION # 24
In the context of a swarm mode cluster, does this describe a node?
Solution: an instance of the Docker engine participating in the swarm
- A. No
- B. Yes
Answer: B
NEW QUESTION # 25
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 # 26
Is this an advantage of multi-stage builds?
Solution: better caching when building Docker images
- A. No
- B. Yes
Answer: A
NEW QUESTION # 27
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution. docker network create -d overlay --secure <network-name>
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
Using docker network create -d overlay --secure <network-name> does not ensure that overlay traffic between service tasks is encrypted. The --secure flag is not a valid option for this command and will cause an error. To ensure that overlay traffic between service tasks is encrypted, you need to use --opt encrypted flag instead.
This flag enables IPsec encryption at the level of the vxlan overlay driver. References:
https://docs.docker.com/engine/reference/commandline/network_create/#options,
https://docs.docker.com/network/overlay/#encryption-and-overlay-networks
NEW QUESTION # 28
Wha is the purpose of Docker Content Trust?
- A. Docker registry TLS verification and encryption
- B. Enabling mutual TLS between the Docker client and server
- C. Signing and verification of image tags
- D. Indicating an image on Docker Hub is an official image
Answer: C
NEW QUESTION # 29
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: The controller managing the pod is autoscaled back to delete the unhealthy pod and alleviate load.
- A. No
- B. Yes
Answer: B
NEW QUESTION # 30
Which of the following commands will ensure that overlay traffic between service tasks is encrypted?
- A. docker service create --network <network-name> --encrypted <service-name>
- B. docker network create -d overlay -o encrypted=true <network-name>
- C. docker network create -d overlay --secure <network-name>
- D. docker service create --network <network-name> --secure <service-name>
Answer: B
NEW QUESTION # 31
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 events deployment api
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
Using kubectl events deployment api does not display the events table for this object. The kubectl events command shows cluster-level events, but it does not accept a resource name as an argument. To see the events table for this object, you need to use kubectl describe deployment api. References:
https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#events,
https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#describe
NEW QUESTION # 32
Which set of commands can identify the publishd port(s) for a container? (Choose 1.)
- A. 'docker network inspect','docker port'
- B. 'docker container inspect', docker port'
- C. 'docker port inspect', 'docker container inspect'
- D. 'docker info','docker network inspect'
Answer: B
NEW QUESTION # 33
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