VALID DCA TEST REGISTRATION | FREE DCA UPDATES

Valid DCA Test Registration | Free DCA Updates

Valid DCA Test Registration | Free DCA Updates

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Docker Certified Associate (DCA) Exam Sample Questions (Q85-Q90):

NEW QUESTION # 85
Will this command mount the host's '/data1 directory to the ubuntu container in read-only mode?
Solution. 'docker run -v /data:/mydata -mode readonly ubuntu'

  • A. Yes
  • B. No

Answer: B

Explanation:
The command docker run -v /data:/mydata -mode readonly ubuntu will not mount the host's /data1 directory to the ubuntu container in read-only mode. The command has several errors that prevent it from working correctly. First, the host directory should be /data1 instead of /data, as specified in the question. Second, the option flag should be --mode instead of -mode, and it should be placed before the image name. Third, the mode value should be ro instead of readonly, as per the Docker documentation1. The correct command should be docker run -v /data1:/mydata --mode ro ubuntu, which will mount the host's /data1 directory as a read-only volume at /mydata inside the container1. References:
* docker run | Docker Docs


NEW QUESTION # 86
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. Yes
  • B. No

Answer: A


NEW QUESTION # 87
Two development teams in your organization use Kubernetes and want to deploy their applications while ensuring that Kubernetes-specific resources, such as secrets, are grouped together for each application.
Is this a way to accomplish this?
Solution: Create one pod and add all the resources needed for each application

  • A. Yes
  • B. No

Answer: B

Explanation:
Explanation
Creating one pod and adding all the resources needed for each application is not a good way to accomplish the goal of grouping Kubernetes-specific resources for each application. This is because pods are the smallest unit of a Kubernetes application, and they are designed to run a single container or a set of tightly coupled containers that share the same network and storage resources1. Pods are ephemeral and can be created and destroyed by the Kubernetes system at any time. Therefore, putting multiple applications in one pod would make them harder to manage, scale, and update independently. A better way to accomplish the goal is to use namespaces, which are logicalclusters within a physical cluster that can isolate resources, policies, and configurations for different applications2. Namespaces can also help organize secrets, which are Kubernetes objects that store sensitive information such as passwords, tokens, and keys3. References:
* Pods | Kubernetes
* Namespaces | Kubernetes
* Secrets | Kubernetes


NEW QUESTION # 88
You want to create a container that is reachable from its host's network.
Does this action accomplish this?
Solution. Use network connect to access the container on the bridge network.

  • A. Yes
  • B. No

Answer: B

Explanation:
= Using network connect to access the container on the bridge network does not accomplish creating a container that is reachable from its host's network. The network connect command connects a container to an existing network, but it does not expose the container's ports to the host1. The bridge network is the default network that Docker creates for containers, and it provides isolation from the host network2. To create a container that is reachable from its host's network, you need to use the host network driver, which disables network isolation and uses the host's network stack directly3. Alternatively, you can use the port mapping feature to publish specific ports of the container to the host4. References:
* docker network connect | Docker Docs
* Bridge network driver | Docker Docs
* Host network driver | Docker Docs
* Publish ports on the host | Docker Docs


NEW QUESTION # 89
Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 4-2-1

  • A. Yes
  • B. No

Answer: B

Explanation:
= This is not how the seven managers should be distributed across three datacenters or availability zones. A swarm cluster is a group of Docker hosts that are running in swarm mode and act as managers or workers1. A manager node is responsible for maintaining the swarm state and orchestrating the services2. A swarm cluster needs a quorum of managers to operate, which means a majority of managers must be available and able to communicate with each other3.
The problem with distributing the seven managers as 4-2-1 is that it creates a split-brain scenario, where the cluster can lose the quorum if one datacenter or availability zone fails. For example, if the datacenter with four managers goes down, the remaining three managers will not have enough votes to form a quorum, and the cluster will stop functioning. Similarly, if the datacenter with one manager goes down, the cluster will lose the tie-breaking vote and will not be able to elect a leader4.
A better way to distribute the seven managers across three datacenters or availability zones is to use 3-2-2, which ensures that the cluster can tolerate the failure of any one datacenter or availability zone and still maintain the quorum. For example, if the datacenter with three managers goes down, the remaining four managers will have enough votes to form a quorum and elect a leader. Similarly, if the datacenter with two managers goes down, the remaining five managers will have enough votes to form a quorum and elect a leader4. References:
* Swarm mode overview | Docker Docs
* Administer and maintain a swarm of Docker Engines | Docker Docs
* Raft consensus in swarm mode | Docker Docs
* Docker Swarm: How to distribute managers across availability zones? - Stack Overflow


NEW QUESTION # 90
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