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 is configuring a firewall filter and wants to verify the syntax of the configuration before committing. 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.
validate
Why wrong: Not a standard Junos CLI command.
commit check
Correctly validates the configuration syntax without committing.
show | display inheritance
Why wrong: Displays inherited configuration statements, not syntax validation.
commit confirmed
Why wrong: Commits with an automatic rollback timer, does not just check syntax.
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 configuration semantics of the candidate configuration without activating it. This allows the engineer to verify that the firewall filter configuration is correct before committing, preventing potential service disruption from a faulty commit.
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.
validate
Why it's wrong here
Not a standard Junos CLI command.
commit check
Why this is correct
Correctly validates the configuration 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.
show | display inheritance
Why it's wrong here
Displays inherited configuration statements, not syntax validation.
commit confirmed
Why it's wrong here
Commits with an automatic rollback timer, does not just check syntax.
Common exam traps
The trap here is that candidates familiar with Cisco IOS may confuse the Junos 'commit check' with the Cisco 'validate' command, but Junos uses 'commit check' for syntax verification and has no 'validate' command.
Trap categories for this question
Command / output trap
Not a standard Junos CLI command.
Detailed technical explanation
Under the hood, 'commit check' runs the same syntax and semantic validation as a normal commit but stops short of applying the configuration to the forwarding plane. This is particularly useful in production environments where a firewall filter with incorrect match conditions (e.g., a missing 'then' action) could block critical traffic; 'commit check' catches such errors before the commit takes 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.
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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 configuration semantics of the candidate configuration without activating it. This allows the engineer to verify that the firewall filter configuration is correct before committing, preventing potential service disruption from a faulty commit.
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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