JN0-106 User Interfaces Practice Question
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?
⚠ Common exam trap
Many exam-takers 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.
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
✓
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.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
commit confirmed
Why this is correct
The 'commit confirmed' command activates the configuration immediately but initiates a rollback timer (default 10 minutes). If the engineer does not issue a 'commit confirm' within that window, Junos automatically reverts to the previous configuration, ensuring the device returns to a known-good state without manual intervention during the maintenance window. This is the correct choice because it provides a safety net for remote or risky configuration changes, allowing the engineer to verify connectivity and operations before finalizing the change.
- ✗
commit check
Why it's wrong here
The 'commit check' command validates the candidate configuration for syntax and semantic errors against the current system state, but it does not activate or apply the configuration. It simply reports whether the configuration is valid, leaving the candidate configuration in place for a later commit. Because it does not change the active configuration, it cannot provide automatic rollback and is not suitable for safely applying changes during a maintenance window.
- ✗
commit synchronize
Why it's wrong here
The 'commit synchronize' command is used on dual Routing Engine (RE) platforms to apply the configuration to both REs at the same time, ensuring they run identical configurations for graceful failover. While it is useful for high availability, it does not implement any automatic rollback mechanism; the commit takes effect immediately on both REs and remains active unless explicitly reversed. Therefore, it does not address the requirement for automatic rollback if the change fails or the session is interrupted.
- ✗
commit at 03:00
Why it's wrong here
The 'commit at 03:00' command schedules the configuration activation for a specific future time using the 'at' option, allowing the engineer to apply changes outside business hours. However, once the scheduled time arrives and the configuration is committed, it stays in effect indefinitely without any automatic rollback. It lacks the confirmation-timer safety feature that would revert to the previous configuration if not confirmed, so it does not meet the stated need for automatic rollback.
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JA
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.