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  1. Home
  2. Docker Certification
  3. DCA Exam
  4. Docker.DCA.v2025-07-01.q110 Dumps
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Question 101

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: Add them to a team in the engineering organization that has read/write access to the engineering/api repository.

Correct Answer: B
Explanation
= I cannot give you a comprehensive explanation, but I can tell you that the question is about Docker Trusted Registry (DTR), which is a secure and scalable image storage solution for Docker Enterprise1. DTR allows you to create organizations and teams to manage access to your repositories2. Adding a new user to an organization does not automatically grant them access to any repository. You need to assign them to a team that has the appropriate permissions for the repository you want them to access3. Therefore, the solution suggests adding them to a team in the engineering organization that has read/write access to the engineering/api repository. You will need to understand how DTR works and how to configure access control for repositories to answer this question correctly. References: You can find some useful references for this question in the following links:
* Docker Trusted Registry overview
* Create and manage organizations and teams
* Manage access to repositories
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Question 102

A host machine has four CPUs available and two running containers. The sysadmin would like to assign two CPUs to each container.
Which of the following commands achieves this?

Correct Answer: C
insert code

Question 103

Does this command create a swarm service that only listens on port 53 using the UDP protocol?
Solution. 'docker service create -name dns-cache -p 53:53 -udp dns-cache'

Correct Answer: B
= The command docker service create -name dns-cache -p 53:53 -udp dns-cache will not create a swarm service that only listens on port 53 using the UDP protocol. The reason is that the command has several syntax errors and invalid options. The correct command to create a swarm service that only listens on port 53 using the UDP protocol is docker service create --name dns-cache --publish published=53,target=53,protocol=udp dns-cache12. The command docker service create -name dns-cache -p 53:53 -udp dns-cache has the following problems:
* The option -name is not a valid option for docker service create. The valid option for specifying the service name is --name3.
* The option -p is not a valid option for docker service create. The valid option for publishing a port for a service is --publish1.
* The option -udp is not a valid option for docker service create. The valid option for specifying the protocol for a published port is protocol within the --publish option1.
* The argument 53:53 is not a valid argument for docker service create. The argument for docker service create should be the image name for the service, such as dns-cache3. The source and target of the published port should be specified in the --publish option, separated by a comma1.
Therefore, the command docker service create -name dns-cache -p 53:53 -udp dns-cache will not work as intended, and will likely produce an error message or an unexpected result. References:
* Use swarm mode routing mesh
* Manage swarm service networks
* docker service create
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Question 104

The Kubernetes yaml shown below describes a clusterIP service.

Is this a correct statement about how this service routes requests?
Solution: Traffic sent to the IP of any pod with the label app: nginx on port 8080 will be forwarded to port 80 in that pod.

Correct Answer: B
The statement is incorrect because it does not mention the service name or the clusterIP address. Traffic sent to the IP of any pod with the label app: nginx on port 8080 will not be forwarded to port 80 in that pod, unless the traffic is coming from another pod within the same cluster that knows the pod IP. To access the service from outside the cluster, the traffic must be sent to the clusterIP address of the service, which is assigned by Kubernetes, and the port 8080 of the service, which is defined in the yaml file. The service will then forward the traffic to one of the selected pods on port 80.
To summarize, the correct statement should be:
Traffic sent to the clusterIP address of the service dca on port 8080 will be forwarded to port 80 in one of the pods with the label app: nginx.
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Question 105

Will This command list all nodes in a swarm cluster from the command line?
Solution. 'docker swarm nodes'

Correct Answer: B
= The command 'docker swarm nodes' is not a valid command to list all nodes in a swarm cluster from the command line. The correct command is docker node ls, which can be run on a manager node to view the details of all the nodes in the swarm1. The docker swarm command is used to manage the swarm itself, not the nodes. For example, you can use docker swarm init to create a new swarm, or docker swarm join to add a node to an existing swarm2. References:
* Manage nodes in a swarm | Docker Docs
* docker swarm | Docker Docs
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