Certification Topics of DCA Exam PDF Recently Updated Questions [Q27-Q45] : Free valid test braindumps : http://free.validbraindumps.com

QUESTION 27
You have just executed ‘docker swarm leave’ on a node. What command can be run on the same node to confirm it has left the cluster?

docker node ls

docker system info

docker system status

QUESTION 28
Is this the purpose of Docker Content Trust?
Solution: Verify and encrypt Docker registry TLS.

Yes

QUESTION 29
The following health check exists in a Dockerfile:
‘HEALTCHECK CMD curl –fail http://localhost/health || exit 1’
Which of the following describes its purpose?

Defines the action taken when container health fails, which in this case will kill the container with exit status 1

Defines the health check endpoint on the localhost interface for external monitoring tools to monitor the health of the docker engine.

Defines the health check endpoint on the local host interface for containers to monitor the health of the docker engine.

Defines the health check for the containerized application so that the application health can be monitored by the Docker engine

QUESTION 30
Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?
Solution: net

Yes

QUESTION 31
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

Yes

QUESTION 32
You want to create a container that is reachable from its host’s network. Does this action accomplish this?
Solution: Use either EXPOSE or –publish to access the containers on the bridge network

Yes

QUESTION 33
Will this command list all nodes in a swarm cluster from the command line?
Solution: ‘docker swarm nodes’

Yes

QUESTION 34
Is this an advantage of multi-stage builds?
Solution: optimizes Images by copying artifacts selectively from previous stages

Yes

QUESTION 35
Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 3-3-1

Yes

QUESTION 36
You have created a Docker bridge network on a host with three containers attached, how do you make this containers accessible outside of the host?

Use network attach to access the containers on the bridge network

Use either EXPOSE or –publish to access the containers on the bridge network

Use network connect to access the containers on the bridge network

Use –link to access the containers on the bridge network
Correct

QUESTION 37
A company’s security policy specifies that development and production containers must run on separate nodes in a given Swarm cluster.
Can this be used to schedule containers to meet the security policy requirements?
Solution: label contraints

Yes

QUESTION 38
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker network create -d overlay -o encrypted=true <network-name>

Yes

QUESTION 39
A docker service ‘web’ is running with a scale factor of 1 (replicas = 1).
Bob intends to use the command ‘docker service update –replicas=3 web’.
Alice intends to use the command ‘docker service scale web=3’.
How do the outcomes oft these two commands differ?

Bob’s command results in an error. Alice’s command updates the number of replicas of the ‘web’ service to 3.

Bob’s command only updates the service definition, but no new replicas are started. Alice’s command results in the actual scaling up of the ‘web’ service.

Bob’s command updates the number of replicas of the ‘web’ service to 3. Alice’s command results in an error.

Both Bob’s and Alice’s commands result in exactly the same outcome, which is 3 instances of the ‘web’ service.

QUESTION 40
Will a DTR security scan detect this?
Solution: licenses for known third party binary components

Yes

QUESTION 41
Does this command display all the pods in the cluster that are labeled as ‘env: development’?
Solution: ‘kubectl get pods -I env=development’

Yes

QUESTION 42
What behavior is expected when a service is created with the following command:
‘docker service create –publish 8000:80 nginx’

All nodes in the cluster will listen on port 8080 and forward to port 80 in the container.

Only a single node in the cluster will listen on port 8080 and forward to port 80 in the
container.

All nodes in the cluster will listen on port 80 and forward to port 8080 in the container.

Only a single node in the cluster will listen on port 80 and forward to port 8080 in the container.

QUESTION 43
You set up an automatic pruning policy on a DTR repository to prune all images using Apache licenses. What effect does this have on images in this repository?

Matching images are untagged once they are older than the pruning threshold set in the repository’s Settings tab.

Matching Images are untagged during the next prune job.

Matching images are deleted during the next prune Job.

Matching images are untagged during the next prune job, and subsequently deleted once they are older than the pruning threshold set in the repository’s Settings tab.

QUESTION 44
Two pods bear the same label, app: dev.
Will a label selector matching app: dev match both of these pods?

Yes, as long as all the containers in those pods are passing their livenessProbes and readinessProbes.

Yes, if both pods were pre-existing when the label selector was declared.

Yes, if the pods are in the same Kubernetes namespace as the object bearing the label selector

Yes, if the pods are in the same Kubernetes namespace as the object bearing the label selector and both pods were preexisting when the label selector was declared.

QUESTION 45
You want to provide a configuration file to a container at runtime. Does this set of Kubernetes tools and steps accomplish this?
Solution: Mount the configuration file directly into the appropriate pod and container using the .spec.containers.configMounts key.

Yes

Certification Topics of DCA Exam PDF Recently Updated Questions [Q27-Q45]

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