Quick Answer
The answer is the rollback 1 command and the load override /config/rescue.conf command. The rollback 1 command restores the previous configuration by reverting the candidate configuration to the most recently committed configuration file, which is stored as juniper.conf.gz. The load override /config/rescue.conf command replaces the entire candidate configuration with the contents of the rescue configuration file, a manually saved baseline that persists across reboots and is ideal for recovering from severe misconfigurations. On the JNCIA-Junos exam, this question tests your understanding of Junos configuration management and recovery methods, often appearing as a trap where candidates confuse rollback with load merge or forget that rollback 0 refers to the current active configuration. A helpful memory tip: think of “rollback 1” as taking one step back to your last good commit, while “load override rescue” is your emergency reset button.
This JNCIA-JUNOS practice question tests your understanding of operational monitoring and maintenance. 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.
Which TWO methods can be used to restore a previous configuration on a Juniper device? (Select two.)
load override /config/rescue.conf
Loads the rescue configuration, which is a backup.
commit confirmed
Why wrong: Commits temporarily but does not restore a previous config.
rollback 1
Reverts to the previous committed configuration.
load replace previous
Why wrong: Not a valid command.
rollback 0
Why wrong: Stays on the current configuration.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
load override /config/rescue.conf
Option A is correct because the 'load override /config/rescue.conf' command replaces the entire candidate configuration with the contents of the rescue configuration file, effectively restoring a previously saved baseline configuration. The rescue configuration is a special, manually saved configuration that persists across reboots and can be used to recover from configuration errors.
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.
load override /config/rescue.conf
Why this is correct
Loads the rescue configuration, which is a backup.
Related concept
Read the scenario before looking for a memorised answer.
commit confirmed
Why it's wrong here
Commits temporarily but does not restore a previous config.
rollback 1
Why this is correct
Reverts to the previous committed configuration.
Related concept
Read the scenario before looking for a memorised answer.
load replace previous
Why it's wrong here
Not a valid command.
rollback 0
Why it's wrong here
Stays on the current configuration.
Common exam traps
The trap here is that candidates often confuse 'rollback 0' with restoring a previous configuration, not realizing that rollback 0 refers to the current active configuration, while rollback 1 or higher is needed to access a prior committed configuration.
Trap categories for this question
Command / output trap
Not a valid command.
Detailed technical explanation
Junos maintains up to 50 previous committed configurations in the /config directory, indexed from 0 (current) to 49 (oldest). The 'rollback 1' command loads the configuration from the previous commit into the candidate configuration, which can then be committed to restore it. The rescue configuration is a special file saved via 'request system configuration rescue save' and is intended for emergency recovery, such as when a device becomes unreachable due to a faulty configuration.
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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Operational Monitoring and Maintenance — study guide chapter
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FAQ
Operational Monitoring and Maintenance — This question tests Operational Monitoring and Maintenance — Read the scenario before looking for a memorised answer..
The correct answer is: load override /config/rescue.conf — Option A is correct because the 'load override /config/rescue.conf' command replaces the entire candidate configuration with the contents of the rescue configuration file, effectively restoring a previously saved baseline configuration. The rescue configuration is a special, manually saved configuration that persists across reboots and can be used to recover from configuration errors.
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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