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  1. Home
  2. Docker Certification
  3. DCA Exam
  4. Docker.DCA.v2024-05-09.q158 Dumps
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Question 26

A Kubernetes node is allocated a /26 CIDR block (64 unique IPs) for its address space.
If every pod on this node has exactly two containers in it, how many pods can this address space support on this node?

Correct Answer: E
Explanation
A Kubernetes node is allocated a /26 CIDR block (64 unique IPs) for its address space. This means that the node can assign up to 64 IP addresses to its resources, such as pods and containers. If every pod on this node has exactly two containers in it, then each pod will need two IP addresses, one for each container. Therefore, the node can support up to 32 pods, since 64 / 2 = 32. The other options are incorrect because they either exceed the available IP addresses or do not account for the number of containers per pod. References:
*CIDR Blocks and Container Engine for Kubernetes - Oracle
*How kubernetes assigns podCIDR for nodes? - Stack Overflow
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Question 27

Does this describe the role of Control Groups (cgroups) when used with a Docker container?
Solution: user authorization to the Docker API

Correct Answer: B
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Question 28

Will this command ensure that overlay traffic between service tasks is encrypted?
Solution:docker service create --network --encrypted

Correct Answer: B
Explanation
= The command docker service create --network --encrypted will not ensure that overlay traffic between service tasks is encrypted. This is because the --network flag requires an argument that specifies the name or ID of the network to connect the service to1. The --encrypted flag is not a valid option for docker service create2. To encrypt overlay traffic between service tasks, you need to use the --opt encrypted flag on docker network create when you create the overlay network3. For example:
docker network create --opt encrypted --driver overlay my-encrypted-network Then, you can use the --network flag on docker service create to connect the service to the encrypted network.
For example:
docker service create --network my-encrypted-network my-service
References:
* docker service create | Docker Documentation
* docker service create | Docker Documentation
* Manage swarm service networks | Docker Docs
I hope this helps you understand the command and the encryption, and how they work with Docker and swarm. If you have any other questions related to Docker, please feel free to ask me.
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Question 29

You created a new service named 'http' and discover it is not registering as healthy. Will this command enable you to view the list of historical tasks for this service?
Solution:'docker service ps http'

Correct Answer: A
Explanation
= The command 'docker service ps http' will list the tasks that are running as part of the 'http' service, as well as the task history1. The task history shows the previous states of the tasks, such as running, shutdown, rejected, etc. This can help you troubleshoot why the service is not registering as healthy, by looking at the current state, error, and ports of each task1. References:
* docker service ps | Docker Docs
* Docker Certified Associate Guide
* DCA Prep Guide
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Question 30

A users attempts to set the system time from inside a Docker container are unsuccessful. Could this be blocking this operation?
Solution: inter-process communication

Correct Answer: B
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