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.
Which THREE statements about commit options are true?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
'commit confirmed' requires a second commit within the timeout to keep the changes.
Option B is correct because the 'commit confirmed' command in Junos applies candidate configuration changes temporarily, and if a second commit (or 'commit check') is not performed within the default 10-minute timeout, the system automatically rolls back to the previous configuration. This is used to prevent lockout during remote management changes.
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.
✗
'commit full' reinitializes the system.
Why it's wrong here
No such command; 'commit full' is not valid.
✓
'commit confirmed' requires a second commit within the timeout to keep the changes.
Why this is correct
If not confirmed, changes are automatically rolled back.
Related concept
Read the scenario before looking for a memorised answer.
✓
'commit synchronize' commits on both Routing Engines in a chassis cluster.
Why this is correct
This ensures config consistency across REs.
Related concept
Read the scenario before looking for a memorised answer.
✓
'commit check' validates syntax without committing.
Why this is correct
It checks the candidate for errors but does not apply it.
Related concept
Read the scenario before looking for a memorised answer.
✗
'commit and-quit' commits and exits configuration mode.
Why it's wrong here
No such command; 'commit' then 'exit' are separate.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse 'commit full' with a system reboot or reinitialization, or assume 'commit and-quit' is a valid shortcut, when in fact Junos requires separate commit and exit commands.
Trap categories for this question
Command / output trap
No such command; 'commit full' is not valid.
Detailed technical explanation
How to think about this question
The 'commit confirmed' command uses a timer (default 10 minutes, configurable with the 'confirm-timeout' option) that, if not refreshed by another commit, triggers an automatic rollback to the previous active configuration. This is particularly useful when making changes over a network connection where a misconfiguration could cause loss of access. The rollback is atomic and ensures the device returns to a known working 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' requires a second commit within the timeout to keep the changes. — Option B is correct because the 'commit confirmed' command in Junos applies candidate configuration changes temporarily, and if a second commit (or 'commit check') is not performed within the default 10-minute timeout, the system automatically rolls back to the previous configuration. This is used to prevent lockout during remote management changes.
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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