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The DCA certification exam is an objective, online-based exam that tests an individual's knowledge and practical skills in various Docker areas. DCA exam consists of 55 multiple choice and multiple select questions with a time limit of 90 minutes to complete. DCA exam is designed to be challenging and requires significant preparation before taking it. Candidates must score a minimum of 65% to pass the exam and earn the DCA certification. Docker Certified Associate (DCA) Exam certification is valid for two years and then must be renewed.
The DCA certification exam is ideal for IT professionals, system administrators, DevOps engineers, and developers who want to demonstrate their proficiency in Docker technologies. Docker Certified Associate (DCA) Exam certification is recognized globally and is an essential requirement for many job roles that involve Docker technologies. Docker Certified Associate (DCA) Exam certification is a valuable asset for anyone looking to advance their career in the field of containerization.
NEW QUESTION # 28
Is this a function of UCP?
Solution: scans images to detect any security vulnerability
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
Scanning images to detect any security vulnerability is not a function of UCP. UCP stands for Universal Control Plane, which is a web-based user interface for managing Docker Enterprise clusters and applications.
UCP does not provide image scanning capabilities, but it integrates with Docker Trusted Registry (DTR), which does offer image scanning as part of its security features. References: https://docs.docker.com/ee/ucp/,
https://docs.docker.com/ee/dtr/user/manage-images/scan-images-for-vulnerabilities/
NEW QUESTION # 29
Is this an advantage of multi-stage builds?
Solution: optimizes Images by copying artifacts selectively from previous stages
- A. No
- B. Yes
Answer: B
Explanation:
Explanation
Multi-stage builds are a feature of Docker that allows you to use multiple FROM statements in your Dockerfile. Each FROM statement creates a new stage of the build, which can use a different base image and run different commands. You can then copy artifacts from one stage to another, leaving behind everything you don't want in the final image. This optimizes the image size and reduces the attack surface by removing unnecessary dependencies and tools. For example, you can use a stage to compile your code, and then copy only the executable file to the final stage, which can use a minimal base image like scratch. This way, you don't need to include the compiler or the source code in the final image. References:
* Multi-stage builds | Docker Docs
* What Are Multi-Stage Docker Builds? - How-To Geek
* Multi-stage | Docker Docs
NEW QUESTION # 30
Two development teams in your organization use Kubernetes and want to deploy their applications while ensuring that Kubernetes-specific resources, such as secrets, are grouped together for each application.
Is this a way to accomplish this?
Solution: Create one namespace for each application and add all the resources to it.
- A. No
- B. Yes
Answer: B
Explanation:
Explanation
Namespaces in Kubernetes are a way to create and organize virtual clusters within physical clusters where we can isolate a group of resources within a single cluster1. Namespace helps to organize resources such as pods, services, and volumes within the cluster2. By creating one namespace for each application and adding all the resources to it, the development teams can ensure that Kubernetes-specific resources, such as secrets, are grouped together for each application. This also provides a scope for names, a mechanism to attach authorization and policy, and a way to divide cluster resources between multiple users3. References:
* Namespaces | Kubernetes
* Kubernetes - Namespaces - GeeksforGeeks
* Namespaces Walkthrough | Kubernetes
NEW QUESTION # 31
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution: Uninstall 'docker-ce' package before installing 'docker-ee' package.
- A. No
- B. Yes
Answer: B
Explanation:
Explanation
Uninstalling 'docker-ce' package before installing 'docker-ee' package does upgrade Docker Engine CE to Docker Engine EE. Docker Engine CE is the free and open source edition of Docker Engine, while Docker Engine EE is the enterprise-ready edition that includes additional features and support. To upgrade from CE to EE, you need to uninstall the 'docker-ce' package and its dependencies, and then install the 'docker-ee' package from the Docker repository. References:
https://docs.docker.com/engine/install/centos/#upgrade-docker-after-using-the-convenience-script,
https://docs.docker.com/engine/install/centos/#install-using-the-repository
NEW QUESTION # 32
Is this statement correct?
Solution.A Dockerfile stores persistent data between deployments of a container
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
= A Dockerfile does not store persistent data between deployments of a container. A Dockerfile is a text document that contains instructions for building a Docker image. A Docker image is a read-only template that defines the layers and configuration of a container. A Docker container is an isolated and ephemeral instance of a Docker image that runs on the Docker Engine. Docker containers are not meant to store persistent data, as any changes made to the container's filesystem are lost when the container is removed. To store persistent data between deployments of a container, you need to use volumes or bind mounts. Volumes and bind mounts are ways to attach external storage to a container, so that the data is preserved even if the container is deleted.
Volumes are managed by Docker and stored in a location on the host system that is independent of the container's lifecycle. Bind mounts are files or directories on the host system that are mounted into a container. References:
* Persist container data
* Dockerfile reference
* Docker MySQL Persistence
* Persist the DB
* Docker - Dockerfile, persist data with VOLUME
NEW QUESTION # 33
Is this an advantage of multi-stage builds?
Solution: better caching when building Docker images
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
Better caching when building Docker images is not an advantage of multi-stage builds. Multi-stage builds are a feature that allows you to use multiple FROM statements in a single Dockerfile. Each FROM statement begins a new stage of the build, with its own base image and instructions. You can selectively copy artifacts from one stage to another, leaving behind everything you don't want in the final image. The advantages of multi-stage builds are:
Reducing the size of the final image by removing unnecessary dependencies or intermediate files.
Improving the security of the final image by minimizing the attack surface and avoiding leaking secrets.
Simplifying the development workflow by using different tools or environments in different stages.
Better caching when building Docker images is not an advantage of multi-stage builds, as it depends on other factors, such as the order and content of the instructions in each stage, the availability and freshness of the base images and intermediate layers, and the use of build arguments or environment variables that may invalidate the cache. References:
https://docs.docker.com/develop/develop-images/multistage-build/,
https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#leverage-build-cache
NEW QUESTION # 34
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution. Disable the Docker service via 'chkconfig' or 'systemctl'.
- A. No
- B. Yes
Answer: A
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 # 35
During development of an application meant to be orchestrated by Kubernetes, you want to mount the /data directory on your laptop into a container.
Will this strategy successfully accomplish this?
Solution. Set containers. Mounts. hostBinding: /data in the container's specification.
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
This strategy does not successfully mount the /data directory on your laptop into a container. Setting containers.mounts.hostBinding to /data in the container's specification is not a valid way to mount a host directory into a container in Kubernetes. Kubernetes does not support mounting arbitrary host directories into containers, as this would break the portability and isolation of pods across different nodes. To mount a host directory into a container in Kubernetes, you need to use one of the following methods:
Use hostPath volume, which allows you to mount a file or directory from the host node's filesystem into your pod.
Use local volume, which allows you to mount local storage devices such as disks or partitions into your pod.
Use persistentVolume and persistentVolumeClaim with hostPath or local volume as storage class, which allows you to abstract the details of how storage is provided from how it is consumed. References:
https://kubernetes.io/docs/concepts/storage/volumes/#hostpath,
https://kubernetes.io/docs/concepts/storage/volumes/#local,
https://kubernetes.io/docs/concepts/storage/persistent-volumes/
NEW QUESTION # 36
Is this the purpose of Docker Content Trust?
Solution.Indicate an image on Docker Hub is an official image.
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
The purpose of Docker Content Trust is not to indicate an image on Docker Hub is an official image. Docker Content Trust is a feature that allows users to verify the integrity and publisher of container images they pull or deploy from a registry server, signed on a Notary server1. Docker Content Trust uses digital signatures to ensure that the images are authentic and have not been tampered with2. Official images are a curated set of Docker repositories that are designed to be the best starting point for most users3. They are not necessarily signed by Docker Content Trust, although some of them are. To indicate an image on Docker Hub is an official image, you can look for the blue "official image" badge on the image page. References:
* Content trust in Docker | Docker Docs
* Docker Content Trust: What It Is and How It Secures Container Images
* Official Images on Docker Hub | Docker Docs
* [Docker Hub Quickstart | Docker Docs]
NEW QUESTION # 37
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 # 38
What is the difference between a resource limit and a resource reservation when scheduling services?
- A. A resource limit and a resource reservation can be used interchangeably.
- B. A resource limit is hard limit for your service, while a reservation is used to find a host with adequate
resources for scheduling. Correct - C. 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.
- D. 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.
Answer: A
NEW QUESTION # 39
Does this describe the role of Control Groups (cgroups) when used with a Docker container?
Solution: role-based access control to clustered resources
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
This does not describe the role of Control Groups (cgroups) when used with a Docker container, because role-based access control to clustered resources is not related to cgroups. According to the official documentation, cgroups are a Linux kernel feature that limits and isolates the resource usage of a group of processes, such as CPU, memory, disk I/O, network, etc. Docker can use cgroups to share available hardware resources to containers and optionally enforce limits and constraints.
References: https://docs.docker.com/config/containers/runmetrics/
https://bikramat.medium.com/namespace-vs-cgroup-60c832c6b8c8
NEW QUESTION # 40
The output of which command can be used to find the architecture and operating system an image is
compatible with?
- A. docker image inspect --filter {{.Architecture}} {{.OS}} ' <image-id>
- B. docker image inspect --format {{.Architecture}} {{.OS}} ' <image-id>
- C. docker image ls <image-id>
- D. docker image info <image-id>
Answer: B
NEW QUESTION # 41
Is this a type of Linux kernel namespace that provides container isolation?
Solution: Storage
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
= Storage is not a type of Linux kernel namespace that provides container isolation. Linux namespaces are a feature of the Linux kernel that partitions kernel resources such that one set of processes sees one set of resources while another set of processes sees a different set of resources1. The feature works by having the same namespace for a set of resources and processes, but those namespaces refer to distinct resources. Since kernel version 5.6, there are 8 kinds of namespaces: mount, UTS, IPC, PID, network, user, cgroup, and time2. Each kind of namespace isolates a different aspect of the system, such as file system mounts, host and domain names, inter-process communication, process IDs, network interfaces, user and group IDs, cgroups, and system time2. Storage is not one of them. References:
* 1: Linux namespaces - Wikipedia
* 2: Namespaces - The Linux Kernel documentation
NEW QUESTION # 42
Is this a type of Linux kernel namespace that provides container isolation?
Solution: Storage
- A. No
- B. Yes
Answer: A
NEW QUESTION # 43
Two development teams in your organization use Kubernetes and want to deploy their applications while ensuring that Kubernetes-specific resources, such as secrets, are grouped together for each application.
Is this a way to accomplish this?
Solution: Create one namespace for each application and add all the resources to it.
- A. No
- B. Yes
Answer: B
Explanation:
Explanation
This is a way to accomplish this, because creating one namespace for each application and adding all the resources to it is a good practice for deploying applications in Kubernetes. According to the official documentation, namespaces are used to group resources into logical units that correspond to different projects, teams, or environments. Using namespaces can help avoid naming collisions and enforce resource quotas and access policies.
References: https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/
NEW QUESTION # 44
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