The correct answer is that the 'commit confirmed 5' command will roll back the configuration after 5 minutes if not confirmed. This is because the Junos commit confirmed option activates a candidate configuration for a specified number of minutes, but if the administrator does not issue a standard 'commit' command within that window, the system automatically reverts to the previous active configuration, preventing lockout from a faulty change. On the JNCIA-Junos exam, this concept tests your understanding of safe configuration practices, often appearing alongside the 'commit check' command—which validates syntax without applying changes—and the 'synchronize' option used on dual Routing Engine systems. A common trap is confusing 'commit confirmed' with a permanent commit; remember that the timer is a safety net, not a delay. For a quick memory tip: think of "confirmed" as a "countdown to rollback"—if you don't confirm before the clock runs out, the change disappears.
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 the 'commit' command are correct?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The 'commit check' command validates the syntax of the candidate configuration.
Option A is correct because the 'commit check' command validates the syntax and semantics of the candidate configuration without activating it. This allows an administrator to verify that the configuration is valid before committing, preventing potential errors from being applied to the active configuration.
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.
✓
The 'commit check' command validates the syntax of the candidate configuration.
Why this is correct
Correct.
Related concept
Read the scenario before looking for a memorised answer.
✓
The 'commit synchronize' command is used on a dual-RE system to commit on both REs.
Why this is correct
Correct.
Related concept
Read the scenario before looking for a memorised answer.
✗
The 'commit full' command activates the configuration without performing any validation.
Why it's wrong here
Commit full forces a full check.
✗
The 'commit' command can only be issued when no other users are in configuration mode.
Why it's wrong here
Multiple users can commit in private mode.
✓
The 'commit confirmed 5' command will roll back the configuration after 5 minutes if not confirmed.
Why this is correct
Correct.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'commit full' with a validation-skipping command, when in fact it performs a more thorough validation, and they may incorrectly assume that multiple users cannot commit simultaneously in Junos, unlike some other network operating systems.
Detailed technical explanation
How to think about this question
The 'commit confirmed' command is used for safe configuration changes, automatically rolling back after a specified timeout (e.g., 5 minutes) if not confirmed with a standard 'commit'. This is critical for remote management scenarios where a misconfiguration could lock out an administrator. The 'commit synchronize' command on dual-RE systems ensures both Routing Engines apply the same configuration, maintaining consistency and high availability.
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: The 'commit check' command validates the syntax of the candidate configuration. — Option A is correct because the 'commit check' command validates the syntax and semantics of the candidate configuration without activating it. This allows an administrator to verify that the configuration is valid before committing, preventing potential errors from being applied to the active configuration.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which THREE statements about the commit operation are correct? (Choose three.)
medium
✓ A.The 'commit check' command validates the syntax of the candidate configuration without activating it.
✓ B.After a successful commit, the candidate configuration becomes the active configuration.
✓ C.A commit can be scheduled to revert automatically if not confirmed within a certain time.
D.The candidate configuration is stored in a file named 'juniper.conf' on the flash drive.
E.A commit operation automatically saves the rescue configuration.
Why A: Option A is correct because the 'commit check' command validates the syntax and semantics of the candidate configuration without activating it. This allows an administrator to verify that the configuration is error-free before making it active, preventing potential misconfigurations from disrupting network operations.
Variation 2. Which TWO statements about the 'commit' operation in Junos are correct?
medium
✓ A.The commit operation validates syntax before applying, and if errors are found, the commit fails.
B.The commit operation automatically rolls back changes after 10 minutes if not confirmed.
C.The commit operation allows you to commit only a specific portion of the configuration.
D.The commit operation applies the configuration changes at the next system reboot.
✓ E.The commit operation activates the candidate configuration as the new active configuration.
Why A: Option A is correct because the 'commit' operation in Junos first validates the candidate configuration for syntax errors and semantic consistency. If any errors are detected, the commit fails and the candidate configuration remains unchanged, preventing invalid configurations from being applied.
Variation 3. Which TWO statements are true about the 'commit' operation in Junos?
medium
✓ A.The commit command validates the configuration syntax before applying it.
B.The commit command automatically saves the configuration to a file on the hard disk.
C.After a commit, the candidate configuration is replaced with the active configuration.
✓ D.A commit can include a comment for documentation purposes.
E.A successful commit overwrites the rollback configurations.
Why A: Option A is correct because the 'commit' command in Junos performs a full syntax and consistency validation of the candidate configuration before applying it. If any errors are detected, the commit is aborted and the candidate configuration remains unchanged, ensuring the active configuration is never corrupted.
Variation 4. Which THREE statements about commit options are true?
hard
A.'commit full' reinitializes the system.
✓ B.'commit confirmed' requires a second commit within the timeout to keep the changes.
✓ C.'commit synchronize' commits on both Routing Engines in a chassis cluster.
✓ D.'commit check' validates syntax without committing.
E.'commit and-quit' commits and exits configuration mode.
Why B: 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.
Last reviewed: Jun 11, 2026
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