Quick Answer
The answer is that the cron daemon (crond) is not running. This is the most likely reason because cron jobs are not standalone processes; they are scheduled and executed solely by the cron daemon, which must be active in the background to read crontab files and launch tasks at the designated times. If crond is stopped or was never started, no jobs will run, and the syslog will remain silent on cron activity since the daemon is not logging anything. On the CompTIA Linux+ XK0-005 exam, this scenario tests your understanding that cron is a service-dependent system—a common trap is to troubleshoot the crontab syntax or permissions first, when the real issue is that the daemon itself is down. A quick memory tip: "No cron, no run—check the daemon before the file."
This XK0-005 practice question tests your understanding of troubleshooting. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 cron job that runs a backup script at 2 AM has not been executing. The syslog shows no errors from cron. What is the most likely reason the job is not running?
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.
The system time zone is incorrect
Why wrong: Would still attempt at the wrong time, but logs would show.
The filesystem is full
Why wrong: Would show 'no space left' errors.
The cron daemon (crond) is not running
Cron jobs require the daemon to be active.
The script has incorrect permissions
Why wrong: Would cause a 'permission denied' error in logs.
Answer choices
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 (crond) is not running
The most likely reason is that the cron daemon (crond) is not running. Cron jobs are executed by the cron daemon, which must be active in the background to read the crontab files and launch scheduled tasks. If crond is stopped or not started, no cron jobs will run, and syslog may not show cron-related errors because the daemon is not logging activity.
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.
The system time zone is incorrect
Why it's wrong here
Would still attempt at the wrong time, but logs would show.
The filesystem is full
Why it's wrong here
Would show 'no space left' errors.
The cron daemon (crond) is not running
Why this is correct
Cron jobs require the daemon to be active.
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.
The script has incorrect permissions
Why it's wrong here
Would cause a 'permission denied' error in logs.
Common exam traps
The trap here is that candidates assume cron errors must appear in syslog if a job fails, but if the daemon itself is not running, there is no process to generate logs, making the absence of errors a key clue.
Trap categories for this question
Command / output trap
Would still attempt at the wrong time, but logs would show.
Detailed technical explanation
The cron daemon (crond) is a system service that checks crontab files every minute for jobs to execute. If crond is not running, no jobs are dispatched, and no errors are logged because the daemon is absent. A common real-world scenario is after a system reboot where the cron service is not enabled to start automatically, or an administrator accidentally stops it during maintenance.
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 XK0-005 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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Troubleshooting — study guide chapter
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Troubleshooting practice questions
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CompTIA Linux+ XK0-005 study guide
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FAQ
Troubleshooting — This question tests Troubleshooting — Read the scenario before looking for a memorised answer..
The correct answer is: The cron daemon (crond) is not running — The most likely reason is that the cron daemon (crond) is not running. Cron jobs are executed by the cron daemon, which must be active in the background to read the crontab files and launch scheduled tasks. If crond is stopped or not started, no cron jobs will run, and syslog may not show cron-related errors because the daemon is not logging activity.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This XK0-005 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the XK0-005 exam.
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