DCA Communication & Stakeholder Relations 5

Question 1

A project stakeholder needs a summary of all running services and their replica counts in a Docker Swarm. Which command provides this?

Accepted Answer

docker service ls

Answer

`docker service ls` lists all services in the Swarm along with their mode, replicas, and image.

Question 2

A DevOps engineer needs to communicate container resource usage to a finance stakeholder in real time. Which command streams live metrics?

Accepted Answer

docker stats

Answer

`docker stats` streams live CPU, memory, network I/O, and disk I/O metrics for running containers.

Question 3

An infrastructure team wants to ensure containers restart automatically after a host reboot. Which restart policy should they configure?

Accepted Answer

--restart unless-stopped

Answer

`--restart unless-stopped` restarts the container on reboot unless it was manually stopped before the host went down.

Question 4

A compliance team asks how to confirm a Docker image has not been tampered with before deployment. What mechanism should you verify?

Accepted Answer

Docker Content Trust (DCT) with image signing

Answer

Docker Content Trust uses cryptographic signatures to verify image integrity and publisher authenticity before deployment.

Question 5

A team lead wants to share a multi-container application topology with new hires. Which artifact best communicates the full service relationship?

Accepted Answer

The docker-compose.yml or stack file

Answer

A Compose or stack YAML file declaratively describes all services, networks, and volumes and their relationships in one place.

DCA - Docker Certified Associate Exam Practice Test