Kubernetes Cloud Native Associate (KCNA) Certification 1 Practice Test

What is a union filesystem in the context of container images?

A memory management technique A network overlay for containers A usability feature of container names A filesystem that combines individual layers into a single view

Correct Answer:

A filesystem that combines individual layers into a single view

Explanation:

A union filesystem is a system that presents multiple directories as one unified filesystem. In container images, each image is built from layered changes. A runtime uses a union filesystem (such as OverlayFS or AUFS) to stack these layers so the container appears to have a single, coherent filesystem. The lower layers are read-only, and there is a writable top layer where any changes are recorded. When a file is modified, the write goes to this top layer without altering the underlying layers, a copy-on-write behavior. This arrangement keeps storage efficient, lets many containers share common base layers, and provides a clean, modular way to compose images from multiple layers.

Access more questions from this quiz

Continue to Kubernetes Cloud Native Associate (KCNA) Certification 1 Practice Test for more practice questions and the full quiz experience.

Access More Questions