JN0-106 Junos Configuration Basics Practice Question
A junior administrator is told to implement configuration changes that must survive a reboot. Which statement is correct?
⚠ Common exam trap
The trap here is that candidates familiar with Cisco IOS often assume 'commit' only writes to running-config (RAM) and that a separate 'copy running-config startup-config' is needed, but in Junos, 'commit' inherently saves to non-volatile storage, making option D a common distractor.
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
✓
Performing a 'commit' saves the active configuration to non-volatile storage.
In Junos, the 'commit' command activates the candidate configuration and saves it to non-volatile storage (the /config directory on the flash drive), ensuring it survives a reboot. This is the standard method for making configuration changes persistent across system restarts.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Performing a 'commit' saves the active configuration to non-volatile storage.
Why this is correct
In Junos, the 'commit' operation takes the candidate configuration, validates it, and installs it as the active configuration while simultaneously writing it to persistent storage on the device's disk. This means the committed configuration is retained in non-volatile memory, such as the /config directory on Junos, and will survive a reboot or power cycle. Therefore, a simple commit is sufficient to ensure the configuration is permanently active.
- ✗
The 'commit confirmed' command ensures persistence.
Why it's wrong here
The 'commit confirmed' command is a safety mechanism that schedules an automatic rollback to the previous active configuration if the administrator does not issue a confirming commit within the specified timeout period. While the initial commit itself does write to non-volatile storage, the feature is not meant to guarantee persistence—it exists solely to prevent lockout or invalid changes by reverting automatically. Thus, it is incorrect to say this command's purpose is ensuring persistence.
- ✗
Changes made using 'set' commands are automatically saved to the startup config.
Why it's wrong here
In the Junos two-stage configuration model, 'set' commands modify the candidate configuration, which exists only in temporary memory and is not part of the operational configuration until explicitly committed. The startup or active configuration remains unchanged until a 'commit' is executed, at which point the candidate is validated, activated, and saved persistently. Therefore, changes made with 'set' are never automatically saved to startup configuration.
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The 'commit' command only writes to RAM, so a 'request system configuration save' is needed.
Why it's wrong here
The 'commit' command does not write only to RAM; it atomically updates the active configuration and writes it to boot-persistent storage on the device, making a separate 'request system configuration save' unnecessary. The 'request system configuration save' command is used to save the current active configuration to an arbitrary file name or to the rescue configuration, not to achieve persistence after a commit. Consequently, the idea that an additional command is needed for non-volatile storage is a misconception.
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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.