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?

Options :

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

Which of the following is true about overlay networks?

Options :

A : Overlay networks are created only on the manager node that you created the overlay networking on

B : Overlay networks are created on all cluster nodes when you create the overlay network.

C : Overlay networks are first created on the manager nodes. Then they are created on the worker nodes once a task is scheduled on the specific worker node.

D : Overlay networks are only created on the manager nodes.

Answer: B

Question 3

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?

Options :

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

B : Matching Images are untagged during the next prune job.

C : Matching images are deleted during the next prune Job.

D : 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.

Answer: A

Question 4

Which statement is true about DTR garbage collection?

Options :

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 5

Will this command list all nodes in a swarm cluster from the command line? Solution: 'docker swarm nodes'

Options :

A : Yes

B : No

Answer: B

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