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 check if a junos configuration file is syntactically correct before applying it. Which command should be used?
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.
load check
Why wrong: 'load check' is not a command; 'commit check' is the correct approach.
commit check
commit check verifies syntax and semantics of the candidate configuration.
check commit
Why wrong: This is not a valid command order; the command is 'commit check'.
validate
Why wrong: 'validate' is not a standard Junos command; 'commit check' is used.
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 syntax and semantics of the candidate configuration without applying it. If errors are found, they are reported, and the configuration is not committed. This allows the engineer to verify correctness before making the change active.
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.
load check
Why it's wrong here
'load check' is not a command; 'commit check' is the correct approach.
commit check
Why this is correct
commit check verifies syntax and semantics of the candidate configuration.
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.
check commit
Why it's wrong here
This is not a valid command order; the command is 'commit check'.
validate
Why it's wrong here
'validate' is not a standard Junos command; 'commit check' is used.
Common exam traps
The trap here is that candidates familiar with Cisco IOS may expect a 'validate' command or confuse the order of keywords, but Junos requires the exact syntax 'commit check' for pre-commit validation.
Trap categories for this question
Command / output trap
'load check' is not a command; 'commit check' is the correct approach.
Detailed technical explanation
The 'commit check' command triggers the same validation routines as a normal commit, including checks for interface references, protocol configurations, and policy statements, but stops before updating the active configuration. This is particularly useful in production environments where applying an invalid configuration could cause service disruption; it allows the engineer to catch errors like missing VLAN definitions or incorrect BGP neighbor addresses before they take effect.
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.
User Interfaces — study guide chapter
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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 syntax and semantics of the candidate configuration without applying it. If errors are found, they are reported, and the configuration is not committed. This allows the engineer to verify correctness before making the change active.
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 24, 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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