Practice DCA Exam Online

Question 1

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

Question 2

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

A : Yes

B : No

Answer: A

Question 3

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 4

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 inspect --format {{.Architecture}} {{.OS}} ' <image-id>

D : docker image info <image-id>

Answer: C

Question 5

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

A : Yes

B : No

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