JN0-106 Operational Monitoring and Maintenance Practice Question
A network engineer needs to check the system's disk space usage. Which command should be used?
⚠ Common exam trap
The trap here is that candidates might confuse 'show system storage' with 'show system uptime' or 'show version' because they all start with 'show system', but only 'show system storage' provides disk space information.
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
✓
show system storage
The 'show system storage' command displays disk space usage on Junos devices, including total, used, and available space for each mounted filesystem. This is the correct command for monitoring storage utilization, as it directly reports on the /, /config, and /var partitions critical for system operation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
show system storage
Why this is correct
The 'show system storage' operational command is the correct Junos CLI command for checking disk space usage. It displays each mounted file system (e.g., /var, /tmp, /config) with total, used, and available space in both kilobytes and percentage, along with mount points. This command is the standard way to monitor disk capacity on Junos devices, particularly for critical partitions like /var that can fill with logs or crash dumps.
- ✗
show configuration
Why it's wrong here
The 'show configuration' command outputs the active Junos configuration in either text, set, or XML format, depending on the pipe modifiers used. While this command can be useful for auditing settings or troubleshooting configuration issues, it does not report any disk usage metrics. Disk space is a system resource concern, not a configuration data concern, so this command is unrelated to checking storage capacity.
- ✗
show version
Why it's wrong here
The 'show version' command displays software information about the Junos OS, including the version string, release number, build date, and the hardware model and serial number of the device. It also shows which packages and patches are installed, which can be useful for compatibility checks, but it provides no information about disk space. This command focuses purely on the software and hardware identity, not on the filesystem state or storage consumption.
- ✗
show system uptime
Why it's wrong here
The 'show system uptime' command presents system time, time since last boot, uptime, and load averages, along with the number of users currently logged in. It is a system-level operational command that gives an overall health snapshot, but it intentionally omits storage details. Disk space usage is not part of the uptime output, so using this command would not help an engineer assess capacity constraints on the device.
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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.