The answer is 3 commits. This is correct because the Junos 'show system commit' command displays a numbered list of every configuration commit made on the device, with each entry assigned a unique commit number starting from 0. In the exhibit, three entries are shown with commit numbers 0, 1, and 2, which means three separate commits have been performed since the device was first configured or since the commit history was last cleared. On the JNCIA-Junos exam, this question tests your ability to read the output of a fundamental operational command and interpret commit numbering correctly. A common trap is confusing the highest commit number with the total count; remember that commit numbers begin at 0, so the total number of commits is always the highest commit number plus one. For a quick memory tip, think of it like counting floors in a building: if the top floor is 2, you have three floors total including the ground floor.
JNCIA-JUNOS Junos OS Fundamentals Practice Question
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.
Exhibit
Refer to the exhibit.
From the output of 'show system commit':
0 2024-03-15 14:00:00 UTC by root via cli
1 2024-03-14 10:00:00 UTC by admin via cli
2 2024-03-13 08:00:00 UTC by root via cli
Refer to the exhibit. How many commits have been made on this device?
Refer to the exhibit.
From the output of 'show system commit':
0 2024-03-15 14:00:00 UTC by root via cli
1 2024-03-14 10:00:00 UTC by admin via cli
2 2024-03-13 08:00:00 UTC by root via cli
A
3
Three commits: IDs 0, 1, and 2.
B
1
Why wrong: There are more than one commit; the numbers go up to 2.
C
2
Why wrong: The highest number is 2, but that is the third commit (0-based).
D
0
Why wrong: The list shows commits, with the most recent at 0; there are three commits total.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
3
The exhibit shows the output of the 'show system commit' command, which lists each commit made on the device. The output displays three entries, each with a unique commit number (0, 1, 2), indicating that three commits have been performed. Therefore, option A is correct.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
Read the scenario before looking for a memorised answer.
✗
1
Why it's wrong here
There are more than one commit; the numbers go up to 2.
✗
2
Why it's wrong here
The highest number is 2, but that is the third commit (0-based).
✗
0
Why it's wrong here
The list shows commits, with the most recent at 0; there are three commits total.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates might misinterpret the commit IDs (0, 1, 2) as the number of commits, but they must remember that the count starts at 0, so the total number of commits is the highest ID plus one (3).
Trap categories for this question
Command / output trap
The list shows commits, with the most recent at 0; there are three commits total.
Detailed technical explanation
How to think about this question
The 'show system commit' command displays the commit history, including the commit ID, user, date, and log message. Each commit increments the commit ID counter, starting from 0, so the highest commit ID plus one equals the total number of commits. In a real-world scenario, understanding commit history is crucial for rollback operations, as you can use 'rollback <commit-id>' to revert to a previous configuration state.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Junos OS Fundamentals — This question tests Junos OS Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 3 — The exhibit shows the output of the 'show system commit' command, which lists each commit made on the device. The output displays three entries, each with a unique commit number (0, 1, 2), indicating that three commits have been performed. Therefore, option A is correct.
What should I do if I get this JNCIA-JUNOS question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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