The correct answer is that a container image is a read-only template used to create containers, and a container in Podman is an instantiation of that image which adds a writable layer on top of the image's read-only layers. This writable layer is the key technical concept: it captures all runtime changes—such as file modifications, new logs, or installed packages—while the underlying image layers remain immutable and shared across containers. On the Red Hat Certified System Administrator EX200 exam, this tests your understanding of container storage architecture, often appearing in questions that distinguish between ephemeral container state and persistent image data. A common trap is assuming the writable layer disappears when the container stops; in Podman, it persists until the container is explicitly removed with `podman rm`. Remember the mnemonic: "Image is the immutable blueprint; container is the mutable house built on top."
EX200 Manage containers Practice Question
This EX200 practice question tests your understanding of manage containers. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO statements are true regarding container images and containers in Podman?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A container is a running or stopped instance of an image with a writable layer.
Option B is correct because a container in Podman is an instantiation of an image that adds a writable layer on top of the image's read-only layers. This writable layer persists changes made during the container's runtime, even after the container is stopped, unless explicitly removed.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
A container can only be created from an image that is stored locally.
Why it's wrong here
Containers can be created from remote images.
✓
A container is a running or stopped instance of an image with a writable layer.
Why this is correct
Correct: containers have a writable layer on top of the image.
Related concept
Read the scenario before looking for a memorised answer.
✓
A container image is a read-only template used to create containers.
Why this is correct
Correct: images are read-only.
Related concept
Read the scenario before looking for a memorised answer.
✗
When a container is stopped, its writable layer is automatically removed.
Why it's wrong here
The writable layer persists until the container is removed.
✗
A container image must be built using a Dockerfile.
Why it's wrong here
Images can be pulled from registries without building.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Red Hat often tests the misconception that a container's writable layer is ephemeral and automatically deleted when the container stops, but in Podman (and Docker) the writable layer persists until the container is explicitly removed.
Detailed technical explanation
How to think about this question
Under the hood, Podman uses OCI-compliant images composed of read-only layers (often stored in `/var/lib/containers/storage`). When a container starts, a thin writable layer (using overlayfs or another union filesystem) is created on top, enabling copy-on-write semantics. This design allows multiple containers to share the same base image layers while maintaining isolated writable state, which is critical for efficient storage and rapid container startup in production environments.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the EX200 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Manage containers — This question tests Manage containers — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A container is a running or stopped instance of an image with a writable layer. — Option B is correct because a container in Podman is an instantiation of an image that adds a writable layer on top of the image's read-only layers. This writable layer persists changes made during the container's runtime, even after the container is stopped, unless explicitly removed.
What should I do if I get this EX200 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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