DCA Financial Management & Budgeting 4

Question 1

A company runs 200 microservices in Docker Swarm. Resource limits are not set on any service. What is the primary financial risk?

Accepted Answer

A noisy-neighbor container can exhaust host resources, causing unplanned scaling costs

Answer

Without limits, a single runaway container can consume all host resources, forcing emergency scale-outs and unexpected cloud spend.

Question 2

Which flag in 'docker service create' sets the guaranteed CPU reservation for each service replica in Docker Swarm?

Accepted Answer

--reserve-cpu

Answer

--reserve-cpu reserves the specified number of CPU cores on the host node for scheduling purposes in Swarm.

Question 3

Which Docker multi-stage build benefit most directly reduces registry storage costs?

Accepted Answer

Smaller final images containing only production artifacts

Answer

Multi-stage builds discard build tools and intermediate files, producing smaller final images that cost less to store and transfer.

Question 4

Which 'docker system df' output column tells you how much disk space could be reclaimed by pruning?

Accepted Answer

RECLAIMABLE

Answer

The RECLAIMABLE column shows how much disk space would be freed if unused images, containers, and volumes were removed.

Question 5

You want to limit the maximum number of processes a container can spawn to prevent fork-bomb attacks that cause unplanned CPU costs. Which flag do you use?

Accepted Answer

--pids-limit

Answer

--pids-limit restricts the total number of processes allowed inside a container, preventing runaway process creation.

DCA - Docker Certified Associate Exam Practice Test

DCA - Docker Certified Associate Exam Practice Test

DCA Financial Management & Budgeting 4