This JNCIA-JUNOS practice question tests your understanding of junos os fundamentals. 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 needs to remove all configuration changes made since the last commit without affecting the current active configuration. Which command should be used?
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 configuration before the last commit, not just uncommitted changes.
deactivate
Why wrong: deactivate disables a configuration statement without removing it.
rollback 0
rollback 0 reverts to the last committed configuration, discarding uncommitted changes.
delete
Why wrong: delete removes configuration statements but requires a commit to take effect.
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 the candidate configuration to the currently active committed configuration, discarding all uncommitted changes without affecting the active configuration. This is the correct way to undo all modifications made since the last commit while keeping the running configuration intact.
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 configuration before the last commit, not just uncommitted changes.
deactivate
Why it's wrong here
deactivate disables a configuration statement without removing it.
rollback 0
Why this is correct
rollback 0 reverts to the last committed configuration, discarding uncommitted changes.
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.
delete
Why it's wrong here
delete removes configuration statements but requires a commit to take effect.
Common exam traps
The trap here is confusing `rollback 0` with `rollback 1`; candidates often think rollback 1 reverts to the last committed state, but rollback 0 is the correct way to discard uncommitted changes while preserving the active configuration.
Detailed technical explanation
Junos maintains a configuration history of up to 50 previous commits (by default), indexed from 0 (current active) to 49. `rollback 0` loads the active configuration into the candidate configuration, effectively discarding any uncommitted edits. This is a non-disruptive operation because the active configuration remains unchanged until a new `commit` is issued.
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
Junos OS Fundamentals — This question tests Junos OS Fundamentals — Read the scenario before looking for a memorised answer..
The correct answer is: rollback 0 — The `rollback 0` command reverts the candidate configuration to the currently active committed configuration, discarding all uncommitted changes without affecting the active configuration. This is the correct way to undo all modifications made since the last commit while keeping the running configuration intact.
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
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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