Practice DCA Exam Online

Question 1

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?

A : Bob's command results in an error. Alice's command updates the number of replicas of the 'web' service to 3.

B : 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.

C : Bob's command updates the number of replicas of the 'web' service to 3. Alice's command results in an error

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

Answer: D

Question 2

You want to create a container that is reachable from its host's network. Does this action accomplish this? Solution: Use network attach to access the containers on the bridge network

A : Yes

B : No

Answer: B

Question 3

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.

A : Yes

B : No

Answer: A

Question 4

Will this command mount the host's '/data' directory to the ubuntu container in read-only mode?

Solution: 'docker run -v /data:/mydata --mode readonly ubuntu'

A : Yes

B : No

Answer: A

Question 5

Which statement is true about DTR garbage collection?

A : Garbage collection removes unreferenced image layers from DTR's backend storage.

B : Garbage collection removes exited containers from cluster nodes.

C : Garbage collection removes DTR images that are older than a configurable of days

D : Garbage collection removes unused volumes from cluster nodes

Answer: A

Name:	Docker Certified Associate
Exam Code:	DCA
Certification:	Docker Certified Associate
Vendor:	Docker
Total Questions:	185
Last Updated:	Apr 22, 2024

Docker DCA