This JNCIA-JUNOS practice question tests your understanding of junos os fundamentals. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 Junos device has multiple configuration files saved. Which command shows the available rollback configurations?
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.
show system configuration
Why wrong: D shows active config only.
show system rollback
Why wrong: A is not a valid command.
show configuration | display rollback
Why wrong: C does not show available rollback points.
show system commit
B shows commit history with rollback IDs.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
show system commit
Option D is correct because the 'show system commit' command displays a list of all committed configuration revisions, including their commit IDs and timestamps, which are used to roll back to a previous configuration. The rollback feature in Junos relies on these stored commit files, and the command explicitly shows the available rollback points.
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.
show system configuration
Why it's wrong here
D shows active config only.
show system rollback
Why it's wrong here
A is not a valid command.
show configuration | display rollback
Why it's wrong here
C does not show available rollback points.
show system commit
Why this is correct
B shows commit history with rollback IDs.
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 familiar with Cisco IOS might expect a 'show rollback' command to list available rollbacks, but Junos uses 'show system commit' for this purpose, and 'show system rollback' only shows the content of a specific rollback when given an ID.
Trap categories for this question
Command / output trap
D shows active config only.
Detailed technical explanation
Junos stores up to 50 previous committed configurations in the /config/ directory as juniper.conf.gz files, each associated with a commit ID (0 for the current, 1 for the most recent rollback, etc.). The 'show system commit' command queries the commit database and displays these IDs along with the user, date, and comment, enabling administrators to select the appropriate rollback point. This is distinct from Cisco IOS, which uses 'show archive' or 'show running-config diff' for similar functionality.
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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FAQ
Junos OS Fundamentals — This question tests Junos OS Fundamentals — Read the scenario before looking for a memorised answer..
The correct answer is: show system commit — Option D is correct because the 'show system commit' command displays a list of all committed configuration revisions, including their commit IDs and timestamps, which are used to roll back to a previous configuration. The rollback feature in Junos relies on these stored commit files, and the command explicitly shows the available rollback points.
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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