Quick Answer
The answer is that the user can edit the candidate configuration. This is the default behavior because Junos uses a separate, private copy of the configuration called the candidate configuration whenever you enter configuration mode. Any changes you make are isolated from the active, running configuration until you explicitly issue the commit command, which then applies those edits. On the JNCIA-Junos exam, this concept tests your understanding of the separation between candidate and active configurations, a fundamental principle of Junos that differs from some other vendors where changes take effect immediately. A common trap is assuming that exiting configuration mode automatically saves changes, but in Junos, edits are discarded unless committed. Remember the memory tip: "Candidate is a sandbox, commit is the gate"—you can play in the sandbox freely, but nothing leaves until the gate opens.
This JNCIA-JUNOS practice question tests your understanding of junos os fundamentals. 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.
What is the default behavior when a user logs in to a Junos device and enters configuration mode?
The user must first commit before making changes.
Why wrong: C is wrong; changes can be made without commit.
The user can edit the candidate configuration.
B is correct; candidate config is edited.
The user can only view the configuration.
Why wrong: D is wrong; configuration mode allows editing.
The user directly modifies the active configuration.
Why wrong: A is wrong; active config is not directly modified.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The user can edit the candidate configuration.
When a user enters configuration mode on a Junos device, they are placed into a private copy of the candidate configuration. This allows the user to make changes without affecting the active configuration until a commit operation is performed. Option B correctly describes this default behavior.
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.
The user must first commit before making changes.
Why it's wrong here
C is wrong; changes can be made without commit.
The user can edit the candidate configuration.
Why this is correct
B is correct; candidate config is edited.
Related concept
Read the scenario before looking for a memorised answer.
The user can only view the configuration.
Why it's wrong here
D is wrong; configuration mode allows editing.
The user directly modifies the active configuration.
Why it's wrong here
A is wrong; active config is not directly modified.
Common exam traps
The trap here is that candidates familiar with Cisco IOS may assume changes are applied immediately (like in 'configure terminal'), but Junos requires an explicit commit to activate changes, and the candidate configuration is a separate, editable copy.
Detailed technical explanation
Junos uses a transactional model where the candidate configuration is stored in a separate database. The 'commit' command validates and applies the candidate configuration to the active configuration, which is the one used by the device's processes. This design allows multiple users to make changes independently and ensures that only validated configurations become active, reducing the risk of misconfiguration.
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
Junos OS Fundamentals — This question tests Junos OS Fundamentals — Read the scenario before looking for a memorised answer..
The correct answer is: The user can edit the candidate configuration. — When a user enters configuration mode on a Junos device, they are placed into a private copy of the candidate configuration. This allows the user to make changes without affecting the active configuration until a commit operation is performed. Option B correctly describes this default behavior.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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