DCA VALID DUMPS FILES & DOCKER TEST DCA TUTORIALS: DOCKER CERTIFIED ASSOCIATE (DCA) EXAM FINALLY PASSED

DCA Valid Dumps Files & Docker Test DCA Tutorials: Docker Certified Associate (DCA) Exam Finally Passed

DCA Valid Dumps Files & Docker Test DCA Tutorials: Docker Certified Associate (DCA) Exam Finally Passed

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Docker Certified Associate (DCA) Exam Sample Questions (Q104-Q109):

NEW QUESTION # 104
The Kubernetes yaml shown below describes a networkPolicy.

Will the networkPolicy BLOCK this trafftc?
Solution. a request issued from a pod bearing the tier: backend label, to a pod bearing the tier: frontend label

  • A. No
  • B. Yes

Answer: B

Explanation:
Explanation
The networkPolicy will block this traffic. A networkPolicy is a Kubernetes resource that defines how pods are allowed to communicate with each other and with other network endpoints. A networkPolicy has two main sections: podSelector and policyTypes. The podSelector selects which pods the networkPolicy applies to. The policyTypes specifies whether the networkPolicy affects ingress (incoming) traffic, egress (outgoing) traffic, or both. In this case, the networkPolicy applies to pods that have a label app: webserver and affects both ingress and egress traffic. The networkPolicy also has two optional sections: ingress and egress. The ingress section defines the rules for allowing ingress traffic to the selected pods. The egress section defines the rules for allowing egress traffic from the selected pods. If either section is missing or empty, it means that no traffic of that type is allowed. In this case, the networkPolicy has an empty ingress section, which means that no ingress traffic is allowed to the pods that have a label app: webserver. Therefore, a request issued from a pod bearing the tier: backend label, to a pod bearing the tier: frontend label will be blocked by this networkPolicy, since it is an ingress traffic to a pod that has a label app: webserver. References:
https://kubernetes.io/docs/concepts/services-networking/network-policies/,
https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.17/#networkpolicy-v1-networking-k8s-io


NEW QUESTION # 105
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution. Disable the Docker service via 'chkconfig' or 'systemctl'.

  • A. Yes
  • B. No

Answer: B

Explanation:
Explanation
Disabling the Docker service via chkconfig or systemctl does not upgrade Docker Engine CE to Docker Engine EE. Disabling the Docker service only stops and prevents Docker from starting automatically on system boot. It does not change or upgrade the version of Docker Engine installed on the system. To upgrade Docker Engine CE to Docker Engine EE, you need to uninstall Docker Engine CE and install Docker Engine EE following the official instructions for your operating system. References:
https://docs.docker.com/engine/install/linux-postinstall/#disable-docker-from-starting-automatically-on-boot,
https://docs.docker.com/engine/install/centos/#uninstall-old-versions,
https://docs.docker.com/engine/install/ubuntu/#uninstall-old-versions,
https://docs.docker.com/engine/install/debian/#uninstall-old-versions,
https://docs.docker.com/ee/docker-ee/linux-install/


NEW QUESTION # 106
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. Yes
  • B. No

Answer: B

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 # 107
The Kubernetes yaml shown below describes a networkPolicy.

Will the networkPolicy BLOCK this trafftc?
Solution. a request issued from a pod bearing only the tier: frontend label, to a pod bearing the tier: backend label

  • A. No
  • B. Yes

Answer: B

Explanation:
The provided Kubernetes NetworkPolicy YAML configuration indicates that the policy applies to pods with the label tier: backend in the default namespace1. The ingress rule allows traffic from pods with the label tier:
api1. Therefore, a request issued from a pod bearing only the tier: frontend label to a pod bearing the tier:
backend label will be blocked by this networkPolicy1. This is because the networkPolicy does not have a rule allowing ingress from pods with the tier: frontend label1. For more information on Kubernetes NetworkPolicies, you can refer to the Kubernetes Documentation on Network Policies.


NEW QUESTION # 108
You want to create a container that is reachable from its host's network. Does this action accomplish this?
Solution: Use network attach to access the containers on the bridge network

  • A. Yes
  • B. No

Answer: B

Explanation:
Explanation
Using network attach to access the containers on the bridge network does not make the container reachable from its host's network. The network attach option connects a running container to another network, but it does not expose any ports to the host. To make a container reachable from its host's network, you need to use either EXPOSE or --publish to access the containers on the bridge network. References:
https://docs.docker.com/engine/reference/commandline/network_connect/,
https://docs.docker.com/config/containers/container-networking/


NEW QUESTION # 109
......

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