This JNCIA-JUNOS practice question tests your understanding of user interfaces. 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.
An engineer needs to apply a configuration change to the device, but only if the configuration is syntactically correct. Which command should be used before committing?
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.
commit
Why wrong: Applies change immediately, no pre-check.
commit check
Validates syntax without committing.
commit confirmed
Why wrong: Commits with a timer, but does not just check.
show | compare
Why wrong: Shows differences, not syntax validation.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
commit check
The 'commit check' command validates the candidate configuration for syntax errors without applying it, making it the correct choice when the engineer only wants to verify syntactic correctness before committing. Unlike 'commit', which applies changes immediately, 'commit check' performs the same validation as a commit but stops short of activating the configuration.
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.
commit
Why it's wrong here
Applies change immediately, no pre-check.
commit check
Why this is correct
Validates syntax without committing.
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.
commit confirmed
Why it's wrong here
Commits with a timer, but does not just check.
show | compare
Why it's wrong here
Shows differences, not syntax validation.
Common exam traps
The trap here is that candidates confuse 'commit check' with 'commit confirmed', thinking both are safe validation commands, but 'commit confirmed' actually applies the configuration and can cause immediate service impact if the syntax is invalid.
Trap categories for this question
Command / output trap
Shows differences, not syntax validation.
Detailed technical explanation
Under the hood, 'commit check' invokes the same syntactic and semantic validation engine as a full commit, including checks for missing mandatory statements, invalid values, and cross-stanza consistency (e.g., referencing a non-existent interface). In real-world scenarios, an engineer might use 'commit check' in a scripted pipeline to validate configuration changes before applying them during a maintenance window, ensuring no syntax errors cause a commit failure that could disrupt services.
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
User Interfaces — This question tests User Interfaces — Read the scenario before looking for a memorised answer..
The correct answer is: commit check — The 'commit check' command validates the candidate configuration for syntax errors without applying it, making it the correct choice when the engineer only wants to verify syntactic correctness before committing. Unlike 'commit', which applies changes immediately, 'commit check' performs the same validation as a commit but stops short of activating the configuration.
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 11, 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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