Quick Answer
The answer is `dnf list available httpd`. This command is correct because it queries all configured DNF repositories and displays the package only if it exists in them, directly fulfilling the requirement to check package availability in DNF repositories without initiating an installation. On the Red Hat Certified System Administrator EX200 exam, this tests your understanding of DNF querying versus installation commands—a common trap is confusing `dnf install` or `dnf search` with the precise `list available` subcommand, which specifically shows only packages that are ready to install from enabled repos. To remember, think of the phrase “list before you install”: `dnf list available` acts like a catalog check, ensuring the package is present in your configured sources before you commit to the installation.
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.
An administrator wants to install a package 'httpd' but only if it is available in the configured repositories. Which command should be used to check if the package exists?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
rpm -q httpd
Why wrong: Checks if already installed.
dnf search httpd
Why wrong: Searches for packages, but 'list available' is more precise.
dnf list available httpd
Shows available packages matching the name.
dnf install httpd
Why wrong: This installs the package, not just check.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
dnf list available httpd
Option C is correct because `dnf list available httpd` queries the configured DNF repositories and displays the package only if it exists in them. This command checks availability without installing, which matches the requirement to verify the package is present in the repositories before proceeding.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
rpm -q httpd
Why it's wrong here
Checks if already installed.
dnf search httpd
Why it's wrong here
Searches for packages, but 'list available' is more precise.
dnf list available httpd
Why this is correct
Shows available packages matching the name.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
dnf install httpd
Why it's wrong here
This installs the package, not just check.
Common exam traps
The trap here is that candidates often confuse `rpm -q` (which checks local installation status) with repository availability checks, or they mistakenly think `dnf search` is the correct command for listing available packages, when in fact `dnf list available` is the precise tool for this task.
Detailed technical explanation
Under the hood, `dnf list available` queries the repository metadata (repomd.xml and primary.xml.gz) to filter packages that are not currently installed and are present in enabled repositories. This command is part of the DNF package manager, the successor to YUM, and uses libsolv for dependency resolution. In a real-world scenario, using `dnf list available` before installation helps avoid errors when a package name is mistyped or when a repository is temporarily unavailable.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Deploy, configure, and maintain systems — This question tests Deploy, configure, and maintain systems — Read the scenario before looking for a memorised answer..
The correct answer is: dnf list available httpd — Option C is correct because `dnf list available httpd` queries the configured DNF repositories and displays the package only if it exists in them. This command checks availability without installing, which matches the requirement to verify the package is present in the repositories before proceeding.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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