This LFCS practice question tests your understanding of service configuration. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 service unit file includes the following: [Install] WantedBy=multi-user.target. What does this directive accomplish?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The service is enabled by symlinking in multi-user.target.wants.
The `WantedBy=multi-user.target` directive in the `[Install]` section of a systemd service unit file does not directly start the service when the target is entered. Instead, when the service is enabled (via `systemctl enable`), systemd creates a symbolic link from the service unit file into the `multi-user.target.wants/` directory. This symlink causes systemd to automatically start the service as a dependency when `multi-user.target` is activated, effectively enabling the service for that target.
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 service is stopped when multi-user.target is stopped.
Why it's wrong here
WantedBy does not cause stopping; it creates a soft dependency.
✗
The service conflicts with multi-user.target.
Why it's wrong here
WantedBy does not create a conflict.
✗
The service is automatically started when the system enters multi-user.target.
Why it's wrong here
This is true for enabled services, but WantedBy itself does not start the service; it enables it.
✓
The service is enabled by symlinking in multi-user.target.wants.
Why this is correct
WantedBy= creates a symlink in the .wants directory of the target when the service is enabled.
Related concept
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 confuse the declarative `WantedBy` directive with an immediate start action (Option C), when in fact it only defines a dependency relationship that takes effect after the service is enabled via symlinking.
Detailed technical explanation
How to think about this question
Under the hood, `systemctl enable` reads the `WantedBy` directive and creates a symlink at `/etc/systemd/system/multi-user.target.wants/<service>.service` pointing to the unit file. When systemd activates `multi-user.target`, it reads all symlinks in its `.wants` directory and starts those units as dependencies. This mechanism allows services to be enabled without modifying the target unit itself, and disabling the service removes the symlink. A real-world scenario: a web server like `nginx.service` with `WantedBy=multi-user.target` ensures it starts automatically on boot into multi-user mode, but only after being enabled.
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 LFCS 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.
Service Configuration — This question tests Service Configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The service is enabled by symlinking in multi-user.target.wants. — The `WantedBy=multi-user.target` directive in the `[Install]` section of a systemd service unit file does not directly start the service when the target is entered. Instead, when the service is enabled (via `systemctl enable`), systemd creates a symbolic link from the service unit file into the `multi-user.target.wants/` directory. This symlink causes systemd to automatically start the service as a dependency when `multi-user.target` is activated, effectively enabling the service for that target.
What should I do if I get this LFCS 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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