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Docker Certified Associate (DCA) exam is an essential certification for IT professionals who want to validate their skills and knowledge in working with Docker containers. DCA exam covers a wide range of topics related to Docker technology and requires you to have a good understanding of its components. With proper preparation and training, passing the DCA Exam can help you advance your career in the IT industry.
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The DCA exam is designed for professionals who are involved in software development, IT operations, and DevOps. DCA exam covers a wide range of topics, including Docker architecture, Docker installation and configuration, Docker networking, Docker security, Docker images and containers, Docker orchestration, and Docker storage. Candidates who pass the DCA Exam are able to demonstrate their proficiency in all these areas.
NEW QUESTION # 141
Is this a supported user authentication method for Universal Control Plane?
Solution. x.500
Answer: B
Explanation:
Explanation
x.500 is not a supported user authentication method for Universal Control Plane (UCP). x.500 is a series of standards for directory services that define how distributed directory information can be accessed and managed over a network. x.500 is not an external authentication backend that UCP supports. UCP supports LDAP, Active Directory, and SAML as external authentication backends. References:
https://docs.docker.com/ee/ucp/admin/configure/external-auth/, https://en.wikipedia.org/wiki/X.500
NEW QUESTION # 142
Will this command mount the host's '/data' directory to the ubuntu container in read-only mode?
Solution: 'docker run -v /data:/mydata --mode readonly ubuntu'
Answer: B
Explanation:
= The command docker run -v /data:/mydata --mode readonly ubuntu is not valid because it has some syntax errors. The correct syntax for running a container with a bind mount is docker run [OPTIONS] IMAGE [COMMAND] [ARG...]. The errors in the command are:
The option flag for specifying the volume is --volume or -v, not -v. For example, -v /data:/mydata should be --volume /data:/mydata.
The option flag for specifying the mode of the volume is --mount, not --mode. For example, --mode readonly should be --mount type=bind,source=/data,target=/mydata,readonly.
The option flag for specifying the mode of the container is --detach or -d, not --mode. For example, --mode readonly should be --detach.
The correct command for running a container with a bind mount in read-only mode is:
docker run --volume /data:/mydata --mount type=bind,source=/data,target=/mydata,readonly --detach ubuntu This command will run a container using the ubuntu image and mount the host's /data directory to the container's /mydata directory in read-only mode. The container will run in the background (--detach).
docker run reference | Docker Documentation : [Use bind mounts | Docker Documentation]
NEW QUESTION # 143
Is this a type of Linux kernel namespace that provides container isolation?
Solution: Authentication
Answer: B
Explanation:
Explanation
= Authentication is not a type of Linux kernel namespace that provides container isolation. Namespaces are a feature of the Linux kernel that partitions kernel resources such that one set of processes sees one set of resources and another set of processes sees a different set of resources. Docker uses six different namespaces to isolate containers from the host and from each other: PID, USER, UTS, IPC, MNT, and NET12.
Authentication is not one of them. Authentication is a process of verifying the identity of a user or a system, which is usually done by using credentials such as passwords, tokens, or certificates. Authentication does not directly affect the isolation of containers, although it can be used to control access to them. References:
* Docker security | Docker Docs
* Securing Docker Containers with Linux Kernel Features | Infosec
NEW QUESTION # 144
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution: Uninstall 'docker-ce' package before installing 'docker-ee' package.
Answer: B
Explanation:
= Uninstalling the 'docker-ce' package before installing the 'docker-ee' package will not upgrade Docker Engine CE to Docker Engine EE. It will only remove the existing Docker Engine CE installation and install a new Docker Engine EE installation. This means that any existing containers, images, volumes, networks, and other Docker resources will be lost. To upgrade Docker Engine CE to Docker Engine EE without losing any data, youneed to use the migration tool provided by Docker1 or follow the steps described in the Docker documentation2 or other online guides34. Reference:
1: Migrate to Engine 1.10 | Docker Docs
2: Install Docker Engine | Docker Docs
3: Switching Docker 18.09 Community Edition to Enterprise Engine with no ...
4: How to upgrade Docker 18.09 Community Edition to Docker Enterprise 18.09
NEW QUESTION # 145
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution. Run docker engine activate.
Answer: A
Explanation:
Explanation
Running docker engine activate does upgrade Docker Engine CE to Docker Engine EE. The docker engine activate command is a convenience script that automates the process of uninstalling Docker Engine CE and installing Docker Engine EE on supported platforms. It requires an activation token or license file that can be obtained from Docker Hub or Docker Store. References:
https://docs.docker.com/engine/install/centos/#upgrade-docker-after-using-the-convenience-script,
https://docs.docker.com/engine/install/ubuntu/#upgrade-docker-after-using-the-convenience-script,
https://docs.docker.com/engine/install/debian/#upgrade-docker-after-using-the-convenience-script
NEW QUESTION # 146
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