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Docker Certified Associate (DCA) Exam Sample Questions (Q25-Q30):

NEW QUESTION # 25
The output of which command can be used to find the architecture and operating system an image is compatible with?

A. docker image inspect --filter {{.Architecture}} {{.OS}} ' <image-id>
B. docker image ls <image-id>
C. docker image info <image-id>
D. docker image inspect --format {{.Architecture}} {{.OS}} ' <image-id>

Answer: D

NEW QUESTION # 26
During development of an application meant to be orchestrated by Kubernetes, you want to mount the /data directory on your laptop into a container.
Will this strategy successfully accomplish this?
Solution: Create a PersistentVolume with storageciass: "" and hostPath: /data, and a persistentVolumeClaim requesting this PV. Then use that PVC to populate a volume in a pod

A. No
B. Yes

Answer: A

Explanation:
Explanation
Creating a PersistentVolume with storageClass: "" and hostPath: /data, and a persistentVolumeClaim requesting this PV, and then using that PVC to populate a volume in a pod is not a strategy that successfully accomplishes this. A PersistentVolume is an API object that represents a piece of storage in the cluster that has been provisioned by an administrator. A PersistentVolumeClaim is a request for storage by a user. A hostPath PersistentVolume uses a file or directory on the node to emulate network-attached storage. However, this type of volume only works on a single node cluster, and it does not work on Windows nodes. Therefore, it cannot be used to mount the /data directory on your laptop into a container. References:
https://kubernetes.io/docs/concepts/storage/persistent-volumes/,
https://kubernetes.io/docs/concepts/storage/volumes/#hostpath

NEW QUESTION # 27
The Kubernetes yaml shown below describes a networkPolicy.

Will the networkPolicy BLOCK this trafftc?
Solution. a request issued from a pod bearing only the tier: frontend label, to a pod bearing the tier: backend label

A. No
B. Yes

Answer: B

Explanation:
The provided Kubernetes NetworkPolicy YAML configuration indicates that the policy applies to pods with the label tier: backend in the default namespace1. The ingress rule allows traffic from pods with the label tier:
api1. Therefore, a request issued from a pod bearing only the tier: frontend label to a pod bearing the tier:
backend label will be blocked by this networkPolicy1. This is because the networkPolicy does not have a rule allowing ingress from pods with the tier: frontend label1. For more information on Kubernetes NetworkPolicies, you can refer to the Kubernetes Documentation on Network Policies.

NEW QUESTION # 28
Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 5-1-1

A. No
B. Yes

Answer: A

Explanation:
Explanation
= I cannot give you a comprehensive explanation, but I can tell you that the question is about Docker Swarm, which is a native clustering solution for Docker1. Docker Swarm allows you to create a group of Docker hosts, called nodes, that work together as a single virtual system1. Nodes can be either managers or workers. Managers are responsible for maintaining the cluster state and orchestrating services, while workers are responsible for running the tasks assigned by managers1. A swarm cluster should have anodd number of managers to avoid split-brain scenarios and ensure high availability2. However, having too many managers can also degrade performance and increase the risk of failures2. Therefore, the recommended number of managers is between 3 and 72. The solution suggests distributing the 7 managers across 3 datacenters or availability zones as 5-1-1, meaning 5 managers in one zone, and 1 manager in each of the other two zones.
This may not be the optimal distribution, as it creates a single point of failure in the zone with 5 managers. If that zone goes down, the remaining 2 managers will not be able to form a quorum and the cluster will become unavailable3. A better distribution may be 3-2-2 or 2-2-2-1, as they provide more redundancy and resilience3.
You will need to understand how Docker Swarm works and how to design a highly available cluster to answer this question correctly. References: You can find some useful references for this question in the following links:
* Docker Swarm overview
* Swarm mode key concepts
* Swarm mode best practices

NEW QUESTION # 29
What is the purpose of multi-stage builds?

A. Better logical separation of Dockerfile instructions for better readability
B. Optimizing images by copying artifacts selectively from previous stages
C. Better caching when building Docker images
D. Faster image builds by allowing parallel execution of Docker builds

Answer: B

NEW QUESTION # 30
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