This JNCIA-JUNOS practice question tests your understanding of user interfaces. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
During a maintenance window, an engineer needs to apply a configuration change that reverts automatically if the commit fails or the administrator does not confirm within a set time. Which feature should be used?
commit confirmed
Correctly implements automatic rollback if not confirmed within the set time.
commit check
Why wrong: Only validates the configuration syntax without committing.
commit synchronize
Why wrong: Applies the commit on both Routing Engines simultaneously.
commit at 03:00
Why wrong: Schedules the commit for a specific time, does not provide automatic rollback.
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
The 'commit confirmed' feature allows an engineer to apply a configuration change that automatically reverts to the previous configuration if the commit is not confirmed within a specified time period (default 10 minutes). This ensures that if the commit fails or the administrator loses connectivity, the system rolls back safely without manual intervention.
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 confirmed
Why this is correct
Correctly implements automatic rollback if not confirmed within the set time.
Related concept
Read the scenario before looking for a memorised answer.
commit check
Why it's wrong here
Only validates the configuration syntax without committing.
commit synchronize
Why it's wrong here
Applies the commit on both Routing Engines simultaneously.
commit at 03:00
Why it's wrong here
Schedules the commit for a specific time, does not provide automatic rollback.
Common exam traps
The trap here is that candidates often confuse 'commit confirmed' with 'commit check' or 'commit synchronize', mistakenly thinking that syntax validation or dual-RE synchronization provides the same automatic rollback safety, but only 'commit confirmed' implements the timed confirmation and automatic revert mechanism.
Detailed technical explanation
Under the hood, 'commit confirmed' creates a rollback point (stored as rollback 1) and starts a timer. If the administrator issues 'commit confirm' before the timer expires, the configuration becomes permanent; otherwise, the system automatically issues a 'rollback 0' to revert to the previous active configuration. This is particularly useful during remote maintenance where network connectivity might be lost after applying a change, preventing lockout scenarios.
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
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FAQ
User Interfaces — This question tests User Interfaces — Read the scenario before looking for a memorised answer..
The correct answer is: commit confirmed — The 'commit confirmed' feature allows an engineer to apply a configuration change that automatically reverts to the previous configuration if the commit is not confirmed within a specified time period (default 10 minutes). This ensures that if the commit fails or the administrator loses connectivity, the system rolls back safely without manual intervention.
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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