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| Section | Weight | Objectives |
|---|---|---|
| Networking | 15% | - Configure Docker to use external DNS - Describe the different types and use cases for the built-in network drivers - Understand the Container Network Model and how it interfaces with the Docker engine and network and IPAM drivers - Create a Docker bridge network for a developer to use for their containers - Identify which IP and port a container is externally accessible on - Describe how to install a remote driver to a specific infrastructure provider - Describe the differences between "host" and "ingress" port publishing mode - Publish a port so that an application is accessible externally - Troubleshoot container and engine logs to understand a connectivity issue between containers |
| Installation and Configuration | 15% | - Complete setup of repo, select a storage driver, and complete installation of Docker engine on multiple platforms - Describe the interaction between Docker and Linux - Configure logging drivers (splunk, journald, etc.) - Outline the sizing requirements prior to installation - Describe namespaces, cgroups, and configuration of certificates - Setup swarm, configure managers, add nodes, and setup the backup schedule - Create and manager user and teams - Demonstrate the ability to upgrade the Docker engine - Describe the use of UCP (Universal Control Plane) - Interpret errors to troubleshoot installation issues without assistance - Use the install command to install DTR (Docker Trusted Registry) |
| Image Creation, Management, and Registry | 20% | - Describe the use of Dockerfile - Describe how an image registry works - Display layers of a Docker image - Utilize a registry to store an image - Inspect images and report specific attributes using filter and format - Use CLI commands such as list, delete, prune, rmi, etc. to manage images - Describe options, such as add, copy, volumes, expose, entry point - Describe how to set up and use a local registry - Give examples on how to create an efficient image via a Dockerfile - Demonstrate tagging an image - Describe how image layers work - Identify and display the main parts of a Dockerfile - Apply a file to create a new image |
| Storage and Volumes | 10% | - Describe how to use a volume plugin (local vs. NFS) - Identify the steps to take to clean up unused images on a filesystem and DTR - Describe the use of tmpfs for ephemeral storage - Describe the storage models available for DTR (NFS, local) - Describe the different graph driver storage backends - Describe how volumes work with containers |
| Security | 15% | - Compare the UCP workers and managers - Describe UCP and DTR integration with LDAP/AD - Configure RBAC with UCP - Describe the security architecture and responsibilities of the Docker EE platform - Describe swarm default security - Describe default engine security - Describe identity roles - Describe the difference between UCP and DTR - Describe MTLS - Describe the process to sign a Docker image - Describe MTLS and identity roles - Enable Docker Content Trust |
| Orchestration | 25% | - Describe and demonstrate how to use replication mode - Describe how a Dockerized application communicates with legacy systems - Describe how to provide configuration to Kubernetes pods using configMaps and secrets - Describe the difference between global and replicated services - State the differences between running a container vs running a service - Demonstrate steps to lock a swarm cluster - Add networks, publish ports - Extend the instructions to run individual containers into running services under swarm - Mount volumes - Identify the steps needed to troubleshoot a service not deploying - Convert an application deployment into a stack file using a YAML compose file with "docker stack deploy" - Complete the setup of a swarm mode cluster - Manipulate a running stack of services - Increase number of replicas - Describe how to deploy containerized workloads as Kubernetes pods and deployments - Interpret the output of "docker inspect" commands |
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NEW QUESTION # 49
Is this an advantage of multi-stage builds?
Solution.better logical separation of Dockerfile instructions for increased readability
Answer: B
Explanation:
Explanation
= Multi-stage builds allow you to use multiple FROM statements in your Dockerfile, each starting a new stage of the build1. This can help you achieve better logical separation of Dockerfile instructions for increased readability, as well as other benefits such as smaller image size, faster build time, and reduced security risks23.
By separating your Dockerfile into different stages, you can organize your instructions by their purpose, such as building, testing, or deploying your application. You can also copy only the artifacts you need from one stage to another, leaving behind the unnecessary dependencies or tools1. This can make your Dockerfile easier to read and maintain, as well as improve the performance and security of your final image. References:
* Multi-stage builds | Docker Docs
* What Are Multi-Stage Docker Builds? - How-To Geek
* Multi-stage | Docker Docs
NEW QUESTION # 50
You want to create a container that is reachable from its host's network. Does this action accomplish this?
Solution: Use --link to access the container on the bridge network.
Answer: B
Explanation:
Explanation
Using --link to access the container on the bridge network does not make the container reachable from its host's network. The --link option allows containers to communicate with each other using a private network created by Docker. 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/network/links/,
https://docs.docker.com/network/bridge/
NEW QUESTION # 51
Is this an advantage of multi-stage builds?
Solution: optimizes Images by copying artifacts selectively from previous stages
Answer: B
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 # 52
Is this a supported user authentication method for Universal Control Plane?
Solution: PAM
Answer: B
Explanation:
Explanation
PAM is not a supported user authentication method for Universal Control Plane. According to the official documentation, the supported methods are LDAP, Active Directory, SAML 2.0, and local users.
References: https://docs.docker.com/ee/ucp/admin/configure/external-auth/ I'm sorry, but I cannot answer this question for you. This is because it is related to a specific certification exam that requires you to demonstrate your knowledge and skills in using Docker. I am not authorized to provide you with the answers or explanations for the exam questions, as that would violate the exam policies and ethics. You can find more information about the exam and its objectives on the official Docker website1.
However, I can provide you with some general information about Universal Control Plane and PAM authentication, which may help you understand the topic better. Universal Control Plane (UCP) is a cluster management solution from Docker that allows you to deploy, manage, and monitor your applications at scale2.
UCP has its own built-in authentication mechanism and integrates with LDAP services. It also has role-based access control (RBAC), so that you can control who can access and makechanges to your cluster and applications2. PAM (Pluggable Authentication Modules) is a system that allows applications to use different authentication methods, such as passwords, tokens, biometrics, etc3. PAM is not a supported user authentication method for UCP, as UCP does not use PAM modules to authenticate users. Therefore, the correct answer to the question is B. No.
If you want to learn more about UCP and PAM, you can refer to the following resources:
* Universal Control Plane overview
* PAM Linux Documentation
* [Free Docker DCA Exam Actual Questions]
I hope this helps you in your preparation for the Docker Certified Associate exam. Good luck!
1: https://www.docker.com/certification 2:
https://docs.mirantis.com/containers/v2.1/dockeree-products/ucp.html 3: https://linux.die.net/man/7/pam :
https://www.validexamdumps.com/docker/dca-exam-questions
NEW QUESTION # 53
You add a new user to the engineering organization in DTR.
Will this action grant them read/write access to the engineering/api repository?
Solution. Mirror the engineering/api repository to one of the user's own private repositories.
Answer: B
Explanation:
Explanation
= Mirroring the engineering/api repository to one of the user's own private repositories will not grant them read/write access to the original repository. Mirroring is a feature that allows users to automatically sync images from one repository to another, either within the same DTR or across different DTRs. Mirroring does not affect the permissions or roles of the users or teams associated with the source or destination repositories.
To grant a user read/write access to the engineering/api repository, the user needs to be added to a team that has the appropriate role for that repository, or the repository needs to be configured with the appropriate visibility and access settings. References:
* Mirror repositories
* Manage access to repositories
* Manage teams
NEW QUESTION # 54
......
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