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 operation are correct? (Choose three.)
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 without activating it.
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.
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 without activating it.
Why this is correct
Syntax-only validation.
Related concept
Read the scenario before looking for a memorised answer.
✓
After a successful commit, the candidate configuration becomes the active configuration.
Why this is correct
That is the purpose of commit.
Related concept
Read the scenario before looking for a memorised answer.
✓
A commit can be scheduled to revert automatically if not confirmed within a certain time.
Why this is correct
This is 'commit confirmed' with a timeout.
Related concept
Read the scenario before looking for a memorised answer.
✗
The candidate configuration is stored in a file named 'juniper.conf' on the flash drive.
Why it's wrong here
Candidate is stored in memory, not directly as a file; active config is in /config.
✗
A commit operation automatically saves the rescue configuration.
Why it's wrong here
Rescue config must be saved manually with 'request system configuration rescue save'.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the candidate configuration with the active configuration file (juniper.conf) or assume that a commit automatically updates the rescue configuration, when in fact the rescue configuration is a manually saved snapshot used for disaster recovery.
Detailed technical explanation
How to think about this question
Under the hood, Junos uses a two-phase commit model: the candidate configuration is stored in a private database (the 'candidate' database) and is not applied until a commit is issued. The 'commit check' command performs a full validation including syntax checks, semantic checks (e.g., referencing interfaces that exist), and resource availability, but does not write to the active database. In real-world scenarios, 'commit check' is critical before a 'commit confirmed' to avoid locking yourself out of the device due to a syntax error in a rollback configuration.
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 without activating it. — 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.
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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