Quick Answer
The answer is the `rollback 0` command. This is correct because in Junos, the candidate configuration is stored separately from the active, committed configuration, and the system maintains a history of committed configurations in numbered rollback slots, with slot 0 always representing the most recently committed state. When you issue `rollback 0`, you discard any uncommitted changes in the candidate configuration and reload the last committed configuration, effectively reverting all pending edits. On the JNCIA-Junos exam, this question tests your understanding of Junos configuration management and the rollback system, often appearing as a straightforward command-choice item where a common trap is confusing `rollback 0` with `rollback 1` (which reverts to the configuration before the last commit). A solid memory tip is to think of zero as the “reset to now” — slot 0 is the current active configuration, so rolling back to it wipes out any uncommitted work.
This JNCIA-JUNOS practice question tests your understanding of user interfaces. 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 network administrator has made several configuration changes and now wants to revert all uncommitted changes back to the last committed configuration. Which command should they use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
rollback 1
Why wrong: rollback 1 reverts to the previous commit, not the last committed one.
load override terminal
Why wrong: load override terminal loads a configuration from terminal, not reverting.
commit check
Why wrong: commit check validates the candidate configuration but does not revert changes.
rollback 0
rollback 0 reverts to the most recent committed 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
rollback 0
The 'rollback 0' command reverts all uncommitted changes and restores the active configuration to the last committed configuration. In Junos, candidate configurations are stored in numbered rollback slots (0 being the most recent committed configuration), so 'rollback 0' discards any uncommitted edits and loads the last committed state.
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.
rollback 1
Why it's wrong here
rollback 1 reverts to the previous commit, not the last committed one.
load override terminal
Why it's wrong here
load override terminal loads a configuration from terminal, not reverting.
commit check
Why it's wrong here
commit check validates the candidate configuration but does not revert changes.
rollback 0
Why this is correct
rollback 0 reverts to the most recent committed configuration.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates confuse 'rollback 0' with 'rollback 1', mistakenly thinking that 'rollback 1' reverts to the last committed configuration, when in fact 'rollback 0' is the correct slot for the most recent committed state.
Detailed technical explanation
Junos maintains up to 50 rollback slots (0–49) by default, where slot 0 always holds the last committed configuration. When you make uncommitted changes, the candidate configuration diverges from the active (committed) configuration; 'rollback 0' copies the contents of slot 0 into the candidate, effectively discarding all uncommitted edits. This command does not affect the active configuration until a subsequent 'commit' is issued, allowing the administrator to verify the rollback before applying it.
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.
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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: rollback 0 — The 'rollback 0' command reverts all uncommitted changes and restores the active configuration to the last committed configuration. In Junos, candidate configurations are stored in numbered rollback slots (0 being the most recent committed configuration), so 'rollback 0' discards any uncommitted edits and loads the last committed state.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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