EX188 Container Image Building Practice Question
Which TWO statements are true regarding the EXPOSE instruction in a Containerfile? (Choose two.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It informs Podman that the container listens on the specified network ports at runtime.
EXPOSE serves as documentation and assists orchestration tools in understanding which ports to publish when using flags like -P.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It informs Podman that the container listens on the specified network ports at runtime.
Why this is correct
EXPOSE documents network port usage.
- ✗
It replaces the need to define environment variables for port configuration.
Why it's wrong here
EXPOSE has no relationship to environment variables.
- ✗
It enforces strict firewall rules inside the container network namespace, blocking unexposed ports.
Why it's wrong here
EXPOSE does not enforce firewall rules or packet filtering.
- ✓
It acts as a type of documentation between the image creator and container operator.
Why this is correct
EXPOSE is primarily documentation for port usage.
- ✗
It automatically publishes all exposed ports to random host ports without needing the -p or -P flag.
Why it's wrong here
Ports are not published to the host automatically without -p or -P.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Red Hat exam blueprint
This EX188 practice question is part of Courseiva's free Red Hat certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the EX188 exam.