This JNCIA-JUNOS practice question tests your understanding of junos configuration basics. 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 junior administrator wants to discard all uncommitted changes made in the current configuration session. Which command accomplishes this?
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.
commit check
Why wrong: 'commit check' validates syntax but does not discard changes.
rollback 0
'rollback 0' reverses all uncommitted changes to the last committed configuration.
load factory-default
Why wrong: 'load factory-default' overwrites the entire configuration with factory defaults, which is too drastic and discards all previous commits.
clear configuration
Why wrong: 'clear configuration' is not a valid command.
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 active committed configuration, effectively discarding all uncommitted changes made during the current session. In Junos, configuration changes are stored in a candidate configuration until explicitly committed; `rollback 0` loads the last committed configuration (index 0) into the candidate, wiping out any uncommitted edits.
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 check
Why it's wrong here
'commit check' validates syntax but does not discard changes.
rollback 0
Why this is correct
'rollback 0' reverses all uncommitted changes to the last 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.
load factory-default
Why it's wrong here
'load factory-default' overwrites the entire configuration with factory defaults, which is too drastic and discards all previous commits.
clear configuration
Why it's wrong here
'clear configuration' is not a valid command.
Common exam traps
The trap here is that candidates familiar with Cisco IOS might expect a `clear configuration` command or think `commit check` discards changes, but Junos requires `rollback 0` to revert uncommitted edits without affecting the active configuration.
Trap categories for this question
Command / output trap
'clear configuration' is not a valid command.
Detailed technical explanation
Junos uses a two-phase commit model: changes are made to a candidate configuration, then committed to become the active configuration. The rollback command uses a numbered index system (0 for the most recent commit, 1 for the previous, etc.), allowing administrators to revert to any previously committed configuration. This is distinct from Cisco IOS, where `clear config` or `no` commands are used to remove changes, and there is no built-in rollback index system without additional 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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Junos Configuration Basics — study guide chapter
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FAQ
Junos Configuration Basics — This question tests Junos Configuration Basics — 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 active committed configuration, effectively discarding all uncommitted changes made during the current session. In Junos, configuration changes are stored in a candidate configuration until explicitly committed; `rollback 0` loads the last committed configuration (index 0) into the candidate, wiping out any uncommitted edits.
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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