Quick Answer
The answer is the commit confirmed command. This is the correct choice because it provides a safety mechanism for safe configuration changes on Junos devices, allowing an administrator to apply changes that automatically revert to the previous configuration if not explicitly confirmed within a default 10-minute timeout period. On the JNCIA-Junos exam, this concept tests your understanding of operational safeguards against lockout or misconfiguration, often appearing in scenario-based questions where you must select the command that ensures changes are only permanent after an explicit commit. A common trap is confusing this with the standard commit command, which applies changes immediately without a rollback safety net. Remember the memory tip: “Confirm to keep, or it sleeps back to the deep”—if you don’t confirm within the timeout, the configuration reverts automatically.
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.
An administrator is configuring a new Junos device and wants to ensure that configuration changes are applied only after explicit commit confirmation. Which configuration statement should be used?
commit synchronize
Why wrong: Used to synchronize configurations between routing engines.
commit at
Why wrong: Schedules a commit at a specified time.
commit check
Why wrong: Validates syntax but does not provide automatic rollback.
commit confirmed
Applies changes temporarily; requires confirmation to keep.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
commit confirmed
Option D is correct because the 'commit confirmed' statement allows an administrator to apply configuration changes that automatically revert to the previous configuration if not explicitly confirmed within a specified timeout period (default 10 minutes). This ensures changes are only permanently applied after an explicit 'commit' confirmation, providing a safety mechanism to prevent lockout or misconfiguration.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
commit synchronize
Why it's wrong here
Used to synchronize configurations between routing engines.
commit at
Why it's wrong here
Schedules a commit at a specified time.
commit check
Why it's wrong here
Validates syntax but does not provide automatic rollback.
commit confirmed
Why this is correct
Applies changes temporarily; requires confirmation to keep.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse 'commit confirmed' with 'commit check' or 'commit at', mistakenly thinking that syntax validation or scheduled commits provide the same automatic rollback safety net, when in fact only 'commit confirmed' enforces explicit confirmation to prevent permanent changes.
Detailed technical explanation
The 'commit confirmed' command uses a timer (default 600 seconds) that starts upon the initial commit; if a subsequent 'commit' (or 'commit check' with confirmation) is not issued before the timer expires, the system automatically rolls back to the previous active configuration. This is particularly useful when making remote changes that could disrupt management access, as it prevents permanent lockout. The rollback is atomic and uses the same commit model as standard Junos commits, ensuring configuration consistency.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Junos Configuration Basics — study guide chapter
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FAQ
Junos Configuration Basics — This question tests Junos Configuration Basics — Read the scenario before looking for a memorised answer..
The correct answer is: commit confirmed — Option D is correct because the 'commit confirmed' statement allows an administrator to apply configuration changes that automatically revert to the previous configuration if not explicitly confirmed within a specified timeout period (default 10 minutes). This ensures changes are only permanently applied after an explicit 'commit' confirmation, providing a safety mechanism to prevent lockout or misconfiguration.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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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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