JN0-106 Operational Monitoring and Maintenance Practice Question
Exhibit
Output of 'show system storage': Filesystem Size Used Avail Capacity Mounted on /dev/da0s1a 512M 100M 412M 19% / /dev/da0s1e 512M 200M 312M 39% /config /dev/da0s1f 2.0G 1.8G 200M 90% /var
Refer to the exhibit. An administrator notices the /var partition is nearly full. Which command can be used to safely reclaim disk space?
⚠ Common exam trap
It's easy for candidates to think manually deleting log files (option C) is safe and effective, but Junos relies on its own cleanup mechanisms to avoid breaking log rotation or losing important diagnostic data.
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
✓
request system storage cleanup
The 'request system storage cleanup' command safely removes old log files, core dumps, and other temporary files that are no longer needed, freeing up space on the /var partition without risking system stability. This is the recommended Junos method for reclaiming disk space because it targets only files that can be safely deleted.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
request system reboot
Why it's wrong here
Rebooting Junos does not initiate any disk cleanup routine; it only clears volatile /tmp and resets processes. Persistent files in /var, such as log files, old core dumps, and unused software images, remain on disk and continue consuming space. Furthermore, if the disk is so full that logging is impaired, a reboot may be difficult or cause additional downtime, making it an ineffective and risky approach.
- ✓
request system storage cleanup
Why this is correct
The 'request system storage cleanup' command is the correct procedure because it safely identifies and removes files that are no longer needed, including old log backups, temporary files, and core dumps that have exceeded retention thresholds. It is designed to avoid deleting active or critical files, and it releases space on /var and other partitions in a controlled manner, making it the recommended first step when disk space is low.
- ✗
delete /var/log/messages
Why it's wrong here
Manually deleting /var/log/messages with 'delete' can be dangerous because the file might be actively written to by the syslog process; even after deletion, the space may remain allocated until the process is restarted. Additionally, you lose a primary troubleshooting resource, and Junos does not automatically rotate or archive the file if you delete it manually, so this approach fails to address the underlying space issue.
- ✗
request system software delete
Why it's wrong here
The 'request system software delete' command is intended to remove installed Junos software packages, such as optional daemons or third-party packages, not to clean up log files or temporary storage. Running this command could uninstall a required package and render the device unbootable or non-functional, so it is completely inappropriate for reclaiming space from /var.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This JN0-106 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 JN0-106 exam.