EX200 Deploy, configure, and maintain systems Practice Question
This EX200 practice question tests your understanding of deploy, configure, and maintain systems. 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 system administrator wants to permanently allow incoming HTTP traffic on RHEL 9 using firewalld. Which two commands will achieve this? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
firewall-cmd --add-port=80/tcp --permanent
Option B is correct because `--add-port=80/tcp --permanent` adds the rule to the permanent configuration, ensuring it persists across reboots. Option E is correct because `--add-service=http --permanent` achieves the same effect using the predefined service name for HTTP (port 80/tcp). Both commands modify the permanent zone configuration directly, which is required for a permanent rule.
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.
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often forget the `--permanent` flag and assume runtime changes persist, or they incorrectly think `--runtime-to-permanent` alone adds the rule, when it only saves existing runtime rules.
Trap categories for this question
Command / output trap
This is a shell command sequence, not a single command; also runtime-to-permanent alone would not add the rule.
Detailed technical explanation
How to think about this question
Firewalld uses a two-tier configuration model: runtime (immediate, volatile) and permanent (persistent across reboots). The `--permanent` flag writes directly to XML files in `/etc/firewalld/zones/`, while `--runtime-to-permanent` copies the current runtime state to those files. The `--add-service=http` command references the predefined service definition in `/usr/lib/firewalld/services/http.xml`, which maps to TCP port 80, allowing firewalld to automatically handle protocol and port details. In real-world scenarios, using `--permanent` directly is preferred for scripting and automation to avoid unintended runtime state persistence.
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.
Deploy, configure, and maintain systems — This question tests Deploy, configure, and maintain systems — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: firewall-cmd --add-port=80/tcp --permanent — Option B is correct because `--add-port=80/tcp --permanent` adds the rule to the permanent configuration, ensuring it persists across reboots. Option E is correct because `--add-service=http --permanent` achieves the same effect using the predefined service name for HTTP (port 80/tcp). Both commands modify the permanent zone configuration directly, which is required for a permanent rule.
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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