This LPIC-1 practice question tests your understanding of administrative tasks. 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.
A user reports that their cron jobs are not executing. The user has a valid crontab file and can execute the commands manually. Which of the following is the most likely cause of this issue?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The cron daemon is not running.
The cron daemon (crond) is responsible for reading crontab files and executing scheduled jobs at the appropriate times. If the cron daemon is not running, no cron jobs will execute, regardless of the validity of the user's crontab file or the user's ability to run the commands manually. This is the most likely cause because it directly prevents the cron system from functioning at all.
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 crontab file uses the wrong time format.
Why it's wrong here
Incorrect time format would cause an error when the crontab is installed, not silently fail later.
✗
The user's home directory is missing.
Why it's wrong here
Missing home directory would not prevent cron from executing commands, though mail delivery might fail.
✗
The user is not in the /etc/cron.allow file.
Why it's wrong here
cron.allow controls who can use cron, not whether existing jobs run.
✓
The cron daemon is not running.
Why this is correct
If cron is not running, no jobs will execute.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
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 often focus on user-level restrictions (like cron.allow or home directory issues) or syntax errors, but the most fundamental requirement—that the cron daemon itself must be running—is overlooked because it is assumed to always be active.
Trap categories for this question
Command / output trap
Missing home directory would not prevent cron from executing commands, though mail delivery might fail.
Detailed technical explanation
How to think about this question
The cron daemon (crond) is typically started at boot via systemd (e.g., `systemctl status crond`) or SysV init scripts. It checks for changes to crontab files by monitoring modification timestamps in `/var/spool/cron/` (or `/var/cron/tabs/` on some systems). If crond is stopped, jobs are simply never dispatched; common causes include accidental service termination, systemd unit failure, or resource exhaustion. A real-world scenario is after a system update that disables the cron service, causing all scheduled tasks to silently fail until the daemon is restarted.
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 LPIC-1 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.
Administrative Tasks — This question tests Administrative Tasks — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The cron daemon is not running. — The cron daemon (crond) is responsible for reading crontab files and executing scheduled jobs at the appropriate times. If the cron daemon is not running, no cron jobs will execute, regardless of the validity of the user's crontab file or the user's ability to run the commands manually. This is the most likely cause because it directly prevents the cron system from functioning at all.
What should I do if I get this LPIC-1 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". 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.
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Question Discussion
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