JNCIA-JUNOS Junos Configuration Basics Practice Question
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 network engineer needs to make a change to a Junos device and ensure the change can be reverted if it causes issues. Which feature should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
commit confirmed
The `commit confirmed` command allows an engineer to commit a configuration change with a timer (default 10 minutes). If the change causes issues and the engineer does not confirm the commit within the timer, the device automatically reverts to the previous active configuration. This provides a safety net to revert changes without manual intervention.
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.
✗
configure exclusive
Why it's wrong here
'configure exclusive' locks the configuration but does not provide automatic rollback.
✓
commit confirmed
Why this is correct
'commit confirmed' commits with an automatic rollback if not confirmed within the timeout period.
Related concept
Read the scenario before looking for a memorised answer.
✗
commit check
Why it's wrong here
'commit check' validates syntax but does not commit or provide rollback.
✗
rollback 0
Why it's wrong here
'rollback 0' cancels uncommitted changes but does not provide a safety net for committed changes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse `commit confirmed` with `rollback 0`, thinking both revert changes, but `rollback 0` is a manual step that does not provide automatic, time-based reversion.
Detailed technical explanation
How to think about this question
The `commit confirmed` command uses a timer that can be customized with the `confirm` option (e.g., `commit confirmed 5` for a 5-minute window). If the timer expires without a `commit` or `commit check` confirmation, the system automatically loads and commits the previous configuration from the rollback file (typically rollback 1). This feature is especially useful during remote maintenance where loss of connectivity could prevent manual rollback, ensuring the device returns to a known good 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 Configuration Basics — This question tests Junos Configuration Basics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: commit confirmed — The `commit confirmed` command allows an engineer to commit a configuration change with a timer (default 10 minutes). If the change causes issues and the engineer does not confirm the commit within the timer, the device automatically reverts to the previous active configuration. This provides a safety net to revert changes without manual intervention.
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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Question Discussion
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