This EX200 practice question tests your understanding of manage containers. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Exhibit
FROM registry.access.redhat.com/ubi8/ubi
RUN yum install -y httpd
COPY index.html /var/www/html/
CMD ["/usr/sbin/httpd", "-D", "FOREGROUND"]
Refer to the exhibit. A developer created this Containerfile to build a custom web server image. The build fails. Which TWO changes are necessary to make the Containerfile correct and allow the build to succeed?
FROM registry.access.redhat.com/ubi8/ubi
RUN yum install -y httpd
COPY index.html /var/www/html/
CMD ["/usr/sbin/httpd", "-D", "FOREGROUND"]
A
Change the FROM line to use ubi9/ubi (Red Hat Universal Base Image 9)
Why wrong: While UBI 9 exists, the error is not about the base image version; changing to UBI 9 is unnecessary and may introduce other issues if the application expects RHEL 8 libraries.
B
Add a specific tag to the FROM line, e.g., ubi8/ubi:8.4
The FROM line should include a tag to pin the image version; otherwise, Podman defaults to 'latest' which may not exist or be unintended.
C
Add an EXPOSE 80 instruction before the CMD
Why wrong: EXPOSE is optional and does not affect the build; it only documents the port. Omission does not cause a build failure.
D
Change yum to dnf in the RUN instruction
UBI 8 images are based on RHEL 8, which uses dnf as the package manager; yum is deprecated and may not work properly.
E
Add a second COPY instruction to copy the container configuration files
Why wrong: The existing COPY is already correct for copying index.html; adding more COPY instructions is not required to fix the build failure.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a specific tag to the FROM line, e.g., ubi8/ubi:8.4
Option A is needed because the FROM line must specify a tag (e.g., ubi8/ubi:latest or a specific version) to avoid ambiguity. Option B is required because Red Hat Enterprise Linux 8 uses dnf instead of yum for package installation. Option C (EXPOSE 80) is not required to fix the build failure; it is documentation for port mapping. Option D (changing FROM to ubi9) is not necessary; the issue is the missing tag, not the base image version. Option E (adding COPY) already exists; an additional COPY is not needed to fix the build.
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.
✗
Change the FROM line to use ubi9/ubi (Red Hat Universal Base Image 9)
Why it's wrong here
While UBI 9 exists, the error is not about the base image version; changing to UBI 9 is unnecessary and may introduce other issues if the application expects RHEL 8 libraries.
✓
Add a specific tag to the FROM line, e.g., ubi8/ubi:8.4
Why this is correct
The FROM line should include a tag to pin the image version; otherwise, Podman defaults to 'latest' which may not exist or be unintended.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add an EXPOSE 80 instruction before the CMD
Why it's wrong here
EXPOSE is optional and does not affect the build; it only documents the port. Omission does not cause a build failure.
✓
Change yum to dnf in the RUN instruction
Why this is correct
UBI 8 images are based on RHEL 8, which uses dnf as the package manager; yum is deprecated and may not work properly.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add a second COPY instruction to copy the container configuration files
Why it's wrong here
The existing COPY is already correct for copying index.html; adding more COPY instructions is not required to fix the build failure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 EX200 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Add a specific tag to the FROM line, e.g., ubi8/ubi:8.4 — Option A is needed because the FROM line must specify a tag (e.g., ubi8/ubi:latest or a specific version) to avoid ambiguity. Option B is required because Red Hat Enterprise Linux 8 uses dnf instead of yum for package installation. Option C (EXPOSE 80) is not required to fix the build failure; it is documentation for port mapping. Option D (changing FROM to ubi9) is not necessary; the issue is the missing tag, not the base image version. Option E (adding COPY) already exists; an additional COPY is not needed to fix the build.
What should I do if I get this EX200 question wrong?
Identify which EX200 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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