This EX200 practice question tests your understanding of manage containers. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
A container running a web server exits immediately after starting. The administrator runs 'podman logs <container>' and sees 'Error: listen tcp :80: bind: address already in use'. What is the most likely cause and solution?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The host port 80 is occupied; use -p 8080:80 to map a different host port.
The error 'address already in use' indicates that port 80 on the host is already occupied by another process. By default, Podman maps container port 80 to host port 80. Using `-p 8080:80` maps the container's port 80 to an unused host port 8080, resolving the conflict without changing the container's internal configuration.
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.
✓
The host port 80 is occupied; use -p 8080:80 to map a different host port.
Why this is correct
Error clearly states address already in use; remapping host port resolves it.
Clue confirmation
The clue words "most likely", "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
SELinux is preventing the container from binding to the port; set enforce to permissive.
Why it's wrong here
SELinux would produce AVC denials, not 'address already in use'.
✗
The container does not have network access; add --network host.
Why it's wrong here
Network access is not the issue; the port is already in use on the host.
✗
The firewall is blocking outbound connections; disable firewalld.
Why it's wrong here
The error is about binding port, not outbound connections.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Red Hat often tests the misconception that SELinux or firewall rules are the cause of port binding errors, when in fact the error message 'address already in use' explicitly points to a port conflict that must be resolved by changing the host port mapping.
Detailed technical explanation
How to think about this question
Podman uses the host's network namespace by default for port binding, so the container's port mapping directly competes with host processes. The `-p` flag leverages iptables rules to redirect traffic from a host port to the container's port, allowing multiple containers to use the same internal port (e.g., 80) as long as their host ports differ. This is analogous to Docker's port mapping and is essential for running multiple web servers on a single host.
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: The host port 80 is occupied; use -p 8080:80 to map a different host port. — The error 'address already in use' indicates that port 80 on the host is already occupied by another process. By default, Podman maps container port 80 to host port 80. Using `-p 8080:80` maps the container's port 80 to an unused host port 8080, resolving the conflict without changing the container's internal configuration.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely", "immediately / without restart". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This EX200 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 EX200 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.