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Docker DCAyԇ} -°DCA}
Posted at 1/19/2026 06:02:41
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⣬@ЩKaoGuTi DCAԇ}IJփݬFMģhttps://drive.google.com/open?id=1PId9qHbHJufl36JxFpVyvdC7GB_pveUz
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µ Docker Certified Associate DCA Mԇ} (Q172-Q177):} #172
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution:docker network create -d overlay --secure
𰸣B
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= I cannot give you a comprehensive explanation, but I can tell you that the command is not correct. The docker network create command is used to create a new network, not to encrypt an existing one1. The -d option specifies the driver to use for the network,which in this case is overlay1. The overlay driver enables multi-host networking for swarm services2. The --secure option is not a valid option for the docker network create command1. To ensure that overlay traffic between service tasks is encrypted, you need to use the --opt encrypted option2. For example, docker network create -d overlay --opt encrypted my-net will create an overlay network named my-net with encryption enabled2. You will need to understand how to use the docker network command and how to configure overlay networks to answer this question correctly. Reference:
Docker network create command documentation: 1
Overlay network encryption documentation: 2
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 3, 4, 5, 6, and [7]. Good luck!
} #173
Will this command list all nodes in a swarm cluster from the command line?
Solution: 'docker Is -a'
𰸣B
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The command docker Is -a does not list all nodes in a swarm cluster from the command line, but rather lists all containers, both running and stopped, on the current node1. To list all nodes in a swarm cluster, you need to use the command docker node ls from a manager node2. This command shows the node ID, hostname, status, availability, and manager status for each node in the swarm2. You can also use the --filter option to filter the output based on various criteria2. References: Docker Documentation, docker node ls
} #174
You configure a local Docker engine to enforce content trust by setting the environment variable
DOCKER_CONTENT_TRUST=1.
If myorg/myimage: 1.0 is unsigned, does Docker block this command?
Solution: docker image import <tarball> myorg/myimage:1.0
𰸣A
} #175
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 get deployment api
𰸣B
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Explanation
The command kubectl get deployment api will only show the status of the deployment object, such as the number of replicas, available pods, and updated pods1. It will not display the events table for the deployment, which contains information about thecreation, scaling, and updating of the deployment and its pods2. To see the events table for the deployment, you need to use the kubectl describe deployment api command, which will show the details of the deployment object, including the events3. Alternatively, you can use the kubectl get events --field-selector involvedObject.name=api command, which will filter the events by the name of the involved object4. References:
* Kubectl: Get Deployments - Kubernetes - ShellHacks
* Events in Kubernetes | Kubernetes
* kubectl Cheat Sheet | Kubernetes
* kubernetes - kubectl get events only for a pod - Stack Overflow
} #176
An application image runs in multiple environments, with each environment using different certificates and ports. Is this a way to provision configuration to containers at runtime?
Solution.Create a Dockerfile for each environment, specifying ports and Docker secrets for certificates.
𰸣B
}f
Explanation
Creating a Dockerfile for each environment, specifying ports and Docker secrets for certificates is not a way to provision configuration to containers at runtime. A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image1. A Dockerfile is used to build an image, not to run a container. Once an image is built, the configuration specified in the Dockerfile cannot be changed at runtime. To provision configuration to containers at runtime, you need to use a different mechanism, such as environment variables, command-line arguments, or config maps234. References:
* Dockerfile reference | Docker Docs
* Environment variables in Compose | Docker Docs
* Override the default command | Docker Docs
* Configuration management with Containers | Kubernetes
} #177
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