The answer is performing a 'commit' saves the active configuration to non-volatile storage. This is correct because in Junos, the commit command moves the candidate configuration from volatile memory to the /config directory on the flash drive, which retains data across power cycles and reboots. Without a commit, any changes exist only in the candidate configuration and are lost when the system restarts. On the JNCIA-Junos exam, this concept tests your understanding of the Junos configuration lifecycle—candidate, active, and persistent—and often appears in questions contrasting 'commit' with 'commit check' or 'rollback'. A common trap is confusing a commit with a simple 'set' command, which only modifies the candidate; persistence requires the explicit commit action. Memory tip: think of "Commit to Disk"—the command literally writes your changes to permanent storage, ensuring they survive any reboot.
JNCIA-JUNOS Junos Configuration Basics Practice Question
This JNCIA-JUNOS practice question tests your understanding of junos configuration basics. 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 junior administrator is told to implement configuration changes that must survive a reboot. Which statement is correct?
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.
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.
✓
Performing a 'commit' saves the active configuration to non-volatile storage.
Why this is correct
Commit writes the configuration to persistent storage, surviving reboots.
Related concept
Read the scenario before looking for a memorised answer.
✗
The 'commit confirmed' command ensures persistence.
Why it's wrong here
Commit confirmed is for automatic rollback, not for ensuring persistence.
✗
Changes made using 'set' commands are automatically saved to the startup config.
Why it's wrong here
Changes are only in candidate until committed.
✗
The 'commit' command only writes to RAM, so a 'request system configuration save' is needed.
Why it's wrong here
Commit writes to persistent storage automatically.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
Under the hood, Junos maintains three configuration databases: the candidate configuration (in RAM), the active configuration (loaded into the kernel and also stored in /config/juniper.conf.gz), and the rescue configuration (a fallback). The 'commit' command validates the candidate, applies it to the kernel, and compresses a copy to /config/juniper.conf.gz, which is read at boot time. A subtle behavior is that if the /config partition is full, a commit may fail, and the administrator must free space or use 'request system storage cleanup'.
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.
Junos Configuration Basics — This question tests Junos Configuration Basics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.