- A
Delete core files manually
Why wrong: Manually deleting core files is risky as you might delete important files. The 'request system storage cleanup' command handles this safely.
- B
Run 'request system storage cleanup'
The 'request system storage cleanup' command safely removes temporary and unnecessary files like old log files, core files, and software images. It preserves important logs.
- C
Reboot the device
Why wrong: Rebooting the device does not free up disk space on the /var partition. It may temporarily clear some temp files, but it is not a reliable cleanup method and causes downtime.
- D
Delete all files in /var/log
Why wrong: Deleting all files in /var/log removes critical system logs, which is not recommended. It may also delete logs needed for troubleshooting.
Quick Answer
The answer is to run the 'request system storage cleanup' command. This is the most appropriate action for cleaning up disk space on a Juniper device because it safely removes non-essential files like old logs, core dumps, and temporary data from the /var partition while preserving critical logs and configuration files, unlike a manual deletion which risks breaking system operations. On the JNCIA-Junos exam, this question tests your understanding of Junos operational commands for system maintenance, often appearing as a scenario where the /var partition is filling up; a common trap is choosing to delete files manually via the shell or using 'file delete', which can corrupt essential data. The key distinction is that 'request system storage cleanup' performs a controlled, safe purge without requiring you to identify which files are safe to remove. Memory tip: think of it as a "smart broom" that sweeps away the dust but leaves the furniture intact.
JNCIA-JUNOS Operational Monitoring and Maintenance Practice Question
This JNCIA-JUNOS practice question tests your understanding of operational monitoring and maintenance. 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 technician notices that the /var partition is filling up on a Juniper device. Which action would be most appropriate to free up space while preserving critical logs?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Run 'request system storage cleanup'
The 'request system storage cleanup' command is the correct action because it safely removes non-essential files such as old log files, core dumps, and temporary files that are no longer needed, while preserving critical logs and configuration files. This command performs a controlled cleanup without risking the deletion of important operational data, making it the most appropriate method for freeing up space on the /var partition.
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.
- ✗
Delete core files manually
Why it's wrong here
Manually deleting core files is risky as you might delete important files. The 'request system storage cleanup' command handles this safely.
- ✓
Run 'request system storage cleanup'
Why this is correct
The 'request system storage cleanup' command safely removes temporary and unnecessary files like old log files, core files, and software images. It preserves important logs.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Reboot the device
Why it's wrong here
Rebooting the device does not free up disk space on the /var partition. It may temporarily clear some temp files, but it is not a reliable cleanup method and causes downtime.
- ✗
Delete all files in /var/log
Why it's wrong here
Deleting all files in /var/log removes critical system logs, which is not recommended. It may also delete logs needed for troubleshooting.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume manual deletion (Option A) or a reboot (Option C) are quick fixes, but they overlook the Junos-specific safe cleanup command that automates the process while preserving essential data.
Trap categories for this question
Command / output trap
Manually deleting core files is risky as you might delete important files. The 'request system storage cleanup' command handles this safely.
Detailed technical explanation
How to think about this question
The 'request system storage cleanup' command leverages Junos OS's internal cleanup scripts that target specific directories like /var/tmp, /var/crash, and /var/log/archive, removing files based on age and retention policies defined in the system's configuration. Under the hood, it uses the 'file cleanup' mechanism that respects the 'system syslog archive' settings, ensuring that only files beyond the configured retention period are purged. In real-world scenarios, this command is particularly useful in high-availability environments where log rotation and core dump management are critical to prevent disk-full conditions that could impact routing protocols or commit operations.
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 JNCIA-JUNOS 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.
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Operational Monitoring and Maintenance — study guide chapter
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FAQ
Questions learners often ask
What does this JNCIA-JUNOS question test?
Operational Monitoring and Maintenance — This question tests Operational Monitoring and Maintenance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Run 'request system storage cleanup' — The 'request system storage cleanup' command is the correct action because it safely removes non-essential files such as old log files, core dumps, and temporary files that are no longer needed, while preserving critical logs and configuration files. This command performs a controlled cleanup without risking the deletion of important operational data, making it the most appropriate method for freeing up space on the /var partition.
What should I do if I get this JNCIA-JUNOS 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.
About these practice questions
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Last reviewed: Jun 24, 2026
This JNCIA-JUNOS practice question is part of Courseiva's free Juniper Networks 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 JNCIA-JUNOS exam.
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