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Docker Certification
DCA Exam
Docker.DCA.v2023-09-25.q118 Dumps

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Question 51

A company's security policy specifies that development and production containers must run on separate nodes in a given Swarm cluster. Can this be used to schedule containers to meet the security policy requirements?
Solution. environment variables

A.Yes
B.No

Correct Answer: B

Explanation
Environment variables cannot be used to schedule containers to meet the security policy requirements.
Environment variables are key-value pairs that can be passed to containers when they are created or run.
Environment variables can be used to configure the behavior of the containerized application or provide runtime information, such as database credentials, API keys, etc. Environment variables do not affect how containers are scheduled on nodes in a swarm mode cluster. References:
https://docs.docker.com/engine/reference/commandline/run/#set-environment-variables-e-env-env-file,
https://docs.docker.com/engine/swarm/services/#create-a-service

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Question 52

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.Yes
B.No

Correct Answer: A

Explanation
The PVC remains unbound until a persistentVolume that matches all requirements of the PVC becomes available is an action Kubernetes takes in this situation. A persistentVolumeClaim (PVC) is a request for storage by a user. A PVC specifies the desired size, access modes, and storage class of the storage. A persistentVolume (PV) is a piece of storage in the cluster that has been provisioned by an administrator. A PV has a lifecycle independent of any individual pod that uses it. A PVC is automatically bound to a suitable PV based on its requirements. If no PV exists that matches the PVC, and dynamic provisioning is not enabled, then the PVC remains unbound indefinitely until a matching PV is created. References:
https://kubernetes.io/docs/concepts/storage/persistent-volumes/,
https://kubernetes.io/docs/concepts/storage/persistent-volumes/#lifecycle-of-a-volume-and-claim

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Question 53

Is this an advantage of multi-stage builds?
Solution: optimizes Images by copying artifacts selectively from previous stages

A.Yes
B.No

Correct Answer: A

Explanation
Optimizing images by copying artifacts selectively from previous stages is an advantage of multi-stage builds.
Multi-stage builds allow you to use multiple FROM statements in your Dockerfile, each starting a new stage of the build. You can selectively copy artifacts from one stage to another, leaving behind everything you don't want in the final image. This reduces the size and complexity of your images, and improves security and performance. References: https://docs.docker.com/build/building/multi-stage/,
https://docs.docker.com/engine/reference/builder/#copy

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Question 54

Is this a function of UCP?
Solution: image role-based access control

A.Yes
B.No

Correct Answer: A

Explanation
Image role-based access control is a function of UCP. UCP allows you to define granular permissions for users and teams to access images stored in DTR. You can assign different roles to users and teams, such as read-only, read-write, or admin, for each image repository or namespace. This way, you can control who can pull or push images to your registry. References: https://docs.docker.com/ee/ucp/

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Question 55

Is this a type of Linux kernel namespace that provides container isolation?
Solution. Process ID

A.Yes
B.No

Correct Answer: A

Explanation
Process ID is a type of Linux kernel namespace that provides container isolation. Process ID (pid) namespace isolates the process ID number space, which means that processes in different pid namespaces can have the same PID. This allows each container to have its own init process (PID 1), which is the first process to start in a container and the ancestor of all other processes in the container. Pid namespace also prevents processes in one container from seeing or signaling processes in another container or on the host system, unless they share the same pid namespace or have the CAP_SYS_PTRACE capability. References:
https://docs.docker.com/engine/reference/run/#pid-settings-pid,
https://en.wikipedia.org/wiki/Linux_namespaces#Process_ID_(pid)

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