2024年最新の100%試験高合格率DCA問題集PDF
合格させる試験完全版DCA問題集179解答
Docker認定アソシエイト（DCA）試験の資格を得るには、候補者はDockerテクノロジーとそのさまざまなコンポーネントを確実に理解する必要があります。また、Dockerコマンドラインインターフェイス（CLI）に精通している必要があり、Docker画像、コンテナ、ネットワークの操作経験があります。候補者は、Dockerトレーニングコースを受講したり、Dockerのドキュメントを読んだり、Dockerテクノロジーを独自に練習したりすることで、試験の準備をすることができます。
Dockerプラットフォームは、コンテナにアプリケーションを構築、出荷、および実行するための強力なツールです。コンテナは軽量でポータブルでスケーラブルであるため、最新のアプリケーション開発と展開に最適なソリューションです。 DCA認定試験では、Dockerエンジン、Docker Swarm、Docker Compose、その他のDockerツールやサービスなど、Dockerプラットフォームに関する候補者の知識をテストします。
Docker Certified Associate（DCA）試験は、Dockerコンテナテクノロジーを扱うことにおける専門知識を証明したいITプロフェッショナルを対象としています。Dockerは、コンテナ内でアプリケーションを開発、展開、実行するオープンソースのプラットフォームです。DCA試験は、Dockerテクノロジーの使用における個人の知識とスキルを検証する認定プログラムです。それは、Dockerコンテナの管理と展開におけるあなたの熟練度を証明する業界認定資格です。
質問 # 51
You are troubleshooting a Kubernetes deployment called api, and want to see the events table for this object. Does this command display it?
Solution: kubectl describe deployment api
- A. No
- B. Yes
正解：B
質問 # 52
The following Docker Compose file is deployed as a stack:
Is this statement correct about this health check definition?
Solution: Health checks test for app health ten seconds apart. If the test fails, the container will be restarted three times before it gets rescheduled.
- A. Yes
- B. No
正解：B
質問 # 53
The following Docker Compose file is deployed as a stack:
Is this statement correct about this health check definition?
Solution: Health checks test for app health ten seconds apart. If the test fails, the container will be restarted three times before it gets rescheduled.
- A. Yes
- B. No
正解：B
解説：
= I cannot give you a comprehensive explanation, but I can tell you that the statement is not entirely correct.
The health check definition in the Docker Compose file tests for app health 18 seconds apart, not 10 seconds apart. Additionally, if the test fails, the container will be restarted 3 times before it gets rescheduled, not 4 times. References:
* Docker Associate Resources and guides: 1 and 2
* Docker Compose health check documentation: 3
* Docker health check documentation: 4
I hope this helps you prepare for your DCA exam. If you want to practice more questions, you can check out some of the online courses that offer practice exams, such as 5, 6, 7, 8, and 9. Good luck!
質問 # 54
In Docker Trusted Registry, is this how a user can prevent an image, such as 'nginx:latest', from being overwritten by another user with push access to the repository?
Solution: Keep a backup copy of the image on another repository.
- A. Yes
- B. No
正解：B
解説：
Explanation
= Keeping a backup copy of the image on another repository is not how a user can prevent an image, such as
'nginx:latest', from being overwritten by another user with push access to the repository. This approach does not prevent the original image from being overwritten, it only provides a way to restore it from another source.
However, this may not be reliable or efficient, as the backup repository may not be in sync with the original one, or may not be accessible at all times. To prevent an image from being overwritten by another user, the user can use the DTR web UI to make the tag immutable1. This feature allows the user to lock a specific tag, so that no one can push a new image with the same tag to the repository. This ensures that the image is always consistent and secure1. References:
* Make a tag immutable | Docker Docs
質問 # 55
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution: Uninstall 'docker-ce' package before installing 'docker-ee' package.
- A. Yes
- B. No
正解：B
解説：
= 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, you need to use the migration tool provided by Docker1 or follow the steps described in the Docker documentation2 or other online guides34. References:
* 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
質問 # 56
One of several containers in a pod is marked as unhealthy after failing its livenessProbe many times. Is this the action taken by the orchestrator to fix the unhealthy container?
Solution: The unhealthy container is restarted.
- A. No
- B. Yes
正解：B
解説：
Explanation
The unhealthy container is restarted by the orchestrator to fix the unhealthy container, because this is the default behavior of Kubernetes when a container fails its livenessProbe. According to the official documentation, Kubernetes will kill and restart the container if it does not become healthy after a certain number of failures.
References:
https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/#define-a-li
質問 # 57
Which of the following constitutes a production-ready devicemapper configuration for the Docker engine?
- A. Utilize the '--storage-opt dm.directlvm_device' Docker daemon option, specifying a block device
- B. Nothing, devicemapper comes ready for production usage out of the box
- C. Format a partition with xfs and mount it at '/var/lib/docker'
- D. Create a volume group in devicemapper and utilize the '--dm.thinpooldev' Docker daemon option, specifying the volume group
正解：A
解説：
Explanation
質問 # 58
Your organization has a centralized logging solution, such as Splunk.
Will this configure a Docker container to export container logs to the logging solution?
Solution: Set the log-driver and log-oPt keys to values for the logging solution (Splunk) In the daemon.json file.
- A. No
- B. Yes
正解：B
解説：
Setting the log-driver and log-opt keys to values for the logging solution (Splunk) in the daemon.json file will configure a Docker container to export container logs to the logging solution. This is because the Splunk logging driver sends container logs to the HTTP Event Collector in Splunk Enterprise and Splunk Cloud1. To use the Splunk driver as the default logging driver, set the keys log-driver and log-opts to appropriate values in the daemon.json configuration file and restart Docker1. To use the Splunk driver for a specific container, use the commandline flags --log-driver and log-opt with docker run1. The Splunk logging driver supports various options, such as splunk-token, splunk-url, splunk-source, splunk-sourcetype, splunk-index, etc1. References:
Splunk logging driver | Docker Docs1
質問 # 59
In the context of a swarm mode cluster, does this describe a node?
Solution: a physical machine participating in the swarm
- A. No
- B. Yes
正解：B
解説：
Explanation
A physical machine participating in the swarm is a node in the context of a swarm mode cluster. A node is an instance of the Docker engine participating in the swarm. A node can be either a physical machine or a virtual machine. Nodes are either managers or workers. Managers maintain cluster state and manage cluster tasks.
Workers execute tasks assigned by managers. References:
https://docs.docker.com/engine/swarm/key-concepts/#nodes-and-services,
https://docs.docker.com/engine/swarm/how-swarm-mode-works/nodes/
質問 # 60
Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?
Solution: net
- A. Yes
- B. No
正解：B
質問 # 61
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker network create -d overlay --secure
- A. Yes
- B. No
正解：B
質問 # 62
One of several containers in a pod is marked as unhealthy after failing its livenessProbe many times. Is this the action taken by the orchestrator to fix the unhealthy container?
Solution: Kubernetes automatically triggers a user-defined script to attempt to fix the unhealthy container.
- A. Yes
- B. No
正解：B
質問 # 63
Following the principle of least privilege, which of the following methods can be used to securely grnt access to the specific user to communicate to a Docker engine? (Choose two.)
- A. Utilize the '--host 127.0.0.1:2375' option to the Docker daemon to listen on port 2375 over
TCP on localhost - B. Utilize the '--host 0.0.0.0:2375' option to the Docker daemon to listen on port 2375 over
TCP on all interfaces - C. Give the user root access to the server to allow them to run Docker commands as root.
- D. Utilize openssl to create TLS client and server certificates, configuring the Docker engine to
use with mutual TLS over TCP. - E. Add the user to the 'docker' group on the server or specify the grouè with the '--group' Docker daemon option.
正解：D、E
質問 # 64
A docker service 'web' is running with a scale factor of 1 (replicas = 1).
Bob intends to use the command 'docker service update --replicas=3 web'.
Alice intends to use the command 'docker service scale web=3'.
How do the outcomes oft these two commands differ?
- A. Both Bob's and Alice's commands result in exactly the same outcome, which is 3 instances of the 'web' service.
- B. Bob's command only updates the service definition, but no new replicas are started. Alice's command results in the actual scaling up of the 'web' service.
- C. Bob's command results in an error. Alice's command updates the number of replicas of the 'web' service to 3.
- D. Bob's command updates the number of replicas of the 'web' service to 3. Alice's command results in an error.
正解：A
質問 # 65
Which 'docker run' flag lifts cgroup limitations?
- A. 'docker run --isolation'
- B. 'docker run --cap-drop'
- C. 'docker run --privileged'
- D. 'docker run --cpu-period'
正解：C
質問 # 66
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